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Joanna Emilio,1 Michelle Schwartz,2–4 Eleanor Feldman,2–4 Amy Kalowitz Bieber,2–4 Amanda Bienenfeld,2–4 Min-Kyung Jung,1 Daniel M Siegel,2,3 Orit Markowitz2–4 1Department of Dermatology, NYIT College of Osteopathic Medicine, Old Westbury, 2Department of Dermatology, SUNY Downstate Medical Center, 3Department of Dermatology, NY Harbor Healthcare System, Brooklyn, 4Department of Dermatology, Mount Sinai Medical Center, New York, NY, USA Abstract: Actinic keratoses (AKs), especially on areas of the face, have a negative impact on a patient's quality of life (QoL). These lesions manifest on sun-damaged skin and have the potential to progress to squamous cell carcinoma. Field-directed therapy alone and in combination with lesion-directed treatment is effective in clearing both visible and nonvisible AK lesions. Topical treatments of AKs thus have the potential to improve a patient's well-being. However, evidence demonstrating improvements in patient QoL is limited, and is mostly based on observational or retrospective studies. Some prospective studies have reported unchanged or even worsening QoL despite excellent treatment outcomes. Our prospective, pilot study demonstrated a significant increase in QoL in 28 subjects with AKs of the face treated with ingenol mebutate gel 0.015%. QoL was assessed at days 0 and 60 using the Skindex-16 survey. Mean overall scores improved from 24.5% at baseline to 15.5% at day 60 (P=0.031). Improvements in QoL were consistent with an 80% reduction in AK lesion number at day 60. These improved QoL findings are in line with those from a recent retrospective study using ingenol mebutate 0.015% gel. This study therefore further demonstrates the potential for field therapy to improve both treatment outcomes and patient satisfaction. Keywords: actinic keratosis, squamous cell carcinoma, ingenol mebutate gel, local skin reaction, quality of life, Skindex-16

Linked Article: Woliner‐van der Weg et al. Br J Dermatol 2021; 184:663–671. [ABSTRACT FROM AUTHOR]

The immunological response of mice submitted to hydantoin treatment was determined. Hydantoin reduced the absolute number of spleen cells in treated animals and did not modify spleen cells reactivity to concanvalin A, although the response to SRBC challenge, as measured by the Jerne plaque-forming cell technique was significantly decreased. Following these findings, the influence of hydantoin on carcinogenesis was evaluated by using the model of urethane-induced lung adenomas in SWR mice. Treatment with hydantoin significantly reduced the incidence of the induced adenomas. We confirmed that hydantoin modifies the immune response of the host mainly by depressing its humoral function and we have shown that this effect was associated with an inhibitory effect on tumour induction. [ABSTRACT FROM AUTHOR]

Background: Skin atrophy and fragility associated with Dermatoporosis result from chronic extracellular matrix (ECM) degradation. A current marketed product, ReFORM & RePAIR COMPLEX with TriHex Technology® (R&R, Alastin Skincare, Inc.), contains actives that aid in recycling the ECM with new matrix components that have been found to be deficient in patients with DP.1 This study evaluates the efficacy of R&R compared to a ceramide moisturizer for reducing acute episodic purpura events and improving atrophic skin associated with this condition over a 24-week period., Study Design: Participants were evaluated in a double-blind, 24-week split-arm study. Each participant applied R&R to one arm and a ceramide moisturizer on the opposite arm twice daily for 24 weeks. Participants’ arms were evaluated at screening/baseline and follow-up visits at weeks 4, 8, 12, 16, and 24. At all visits, different assessment parameters were evaluated at selected clinical trial centers including standardized photography, skin biopsies, skin barrier function, hydration/transepidermal water loss (TEWL) measurements, line-field confocal optical coherence tomography imaging (LC-OCT), and ultrasound imaging. Efficacy assessments were performed by blinded investigators, and participants completed global improvement questionnaires for each arm. Pre- and post-treatment biopsies were collected for histological evaluation in randomly selected consenting participants., Results: Thirty-eight (38) participants completed the study, and statistically significant improvements were seen across all arm skin parameters evaluated after 24 weeks of treatment. The R&R treatment arm achieved greater mean improvements and showed substantially better TEWL recovery compared to the ceramide moisturizer treatment arm. Ultrasound analysis revealed improvement in rete pegs and dermoepidermal junction (DEJ) undulation associated with the R&R-treated arm in 83% of study participants compared to the ceramide moisturizer-treated arm (17%). Significantly improved DEJ undulation and strengthening was seen in the R&R-treated arm, which was confirmed by LC-OCT imaging. Histology revealed improved collagen formation in the majority of R&R-treated arm case biopsies, as opposed to the comparator arms, which showed minimal improvements with early changes in elastin formation only evident in the R&R group. In addition, the R&R arms demonstrated more skin resilience and less bruising and skin fragility than the comparator arms., Conclusion: Dermatoporosis is a condition that takes years to evolve, and recovery is expected to take time. That noted, this study revealed that the DEJ is the first anatomic area to demonstrate improvement in DP status. This was evident in the R&R-treated arms. In addition, skin functionality related to TEWL measurements, overall texture, crepiness, and biopsy changes were all improved to a larger extent in the R&R-treated arms compared to the comparator arms, demonstrating the logical use of R&R for DP management. J Drugs Dermatol. 2024;23(12):1064-1071. doi:10.36849/JDD.8177.

Dermatoporosis as a disease entity is relatively newly described, the title conceived as recently as 2007. The background of chronic skin fragility, bruising, and atrophy appears to start in some patients as early as their mid-forties, but is full blown over the age of 65 years. The dehydration and fragility of the skin with recurrent bruising and breakdown were initially attributed to increased vessel fragility and permeability thought to be associated with inherent vascular tissue defects in a milieu of increased inflammation and extracellular matrix (ECM) degradation. It has subsequently been demonstrated that this ECM breakdown directly affects the structural support system of the superficial vessels, leading to stretch, increased permeability, and vulnerability to mechanical damage. Add to that the ECM atrophy and general accumulation of non-functional metabolic waste products in the form of fragmented collagen, elastin, and increased circulating glycation end products, and it becomes apparent that much of the problem resides in a structural defect, non-functioning, dehydrated, senescent cellular matrix and unsupported vascular system that presents as dermatoporotic characteristics. This paper describes a strategy of ECM replacement to counteract these foundational deficiencies. J Drugs Dermatol. 2023;22(9): doi:10.36849/JDD.7549.

Optical coherence tomography (OCT) is a noninvasive imaging technology that can visualize nail morphology in diseases such as psoriatic arthritis or onychomycosis. We recommend removal of glitter nail art to properly assess nail pathology and decrease diagnostic delay.

Abstract: Few reported cases discuss distinguishing between melanoma and melanoacanthoma, a seborrheic keratosis (SK) variant, using noninvasive imaging devices. We present a case of a 38-year-old man with Fitzpatrick skin type IV with an asymmetric black papule showing clinical and dermoscopic features of both melanoma and SK. Reflectance confocal microscopy (RCM) and dynamic optical coherence tomography (d-OCT) were used for further evaluation. RCM revealed acanthotic epidermis with a mixed honeycomb and cobblestone pattern, polycyclic bulbous rete ridges, and bright plump cells within entrapped, edged, dermal papillae, compatible with pigmented SK. Also noted were a population of fairly uniform bright dendritic cells scattered quite evenly at all levels of the epidermis and the notable absence of concomitant features of a melanocytic neoplasm (roundish Pagetoid cells, sheets of roundish or dendritic cells at the dermal-epidermal junction, junctional thickenings, and melanocytic nests), suggesting melanoacanthoma. d-OCT showed well-circumscribed, regular, epidermal acanthosis, superficial rounded hypodense structures, normal vascular flow, and notable absence of wiry or contoured vessels, features typically seen in SKs and benign lesions, respectively. Similarly, histologic examination revealed characteristics of pigmented SK containing a population of evenly dispersed dendritic melanocytes (decorated using Melan-A stain) confirming a diagnosis of melanoacanthoma. This case highlights the advantages of incorporating both RCM and d-OCT into clinical practice to noninvasively differentiate melanoma from its clinical mimickers., Competing Interests: M. Gill is a consulting investigator on an investigator-initiated study for DBV technologies on a topic unrelated to those described in this study and serves as a research consultant to the Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY. The other authors declare no conflicts of interest., (Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.)

Background: Onychomycosis affects 43 million people in the United States and Europe. Topical therapies can be effective but require lengthy and costly regimens without an established method for predicting the treatment outcome., Objective: We studied the role of optical coherence tomography (OCT), a noninvasive imaging device approved by the United States Food and Drug Administration, in evaluating onychomycosis treatment outcomes., Methods: This investigator-initiated prospective clinical study recruited subjects from two urban medical centers. A total of 34 subjects with mild-to-moderate onychomycosis, confirmed using periodic acid-Schiff (PAS) staining, were treated with topical efinaconazole for 48 weeks, at which time a final PAS result was obtained., Results: A positive final PAS result was associated with fungal findings on OCT and with nonclearance of fungal findings by week 12. A negative final PAS was associated with the absence of fungal findings by week 12. OCT findings at Week 8 may suggest a 77% chance of mycological nonclearance or 82% chance of clearance. These predictive values are higher than the currently documented mycological cure rate of 54%. Clinical examination data had no predictive value alone or in concert with OCT., Conclusion: We recommend OCT imaging be performed at the end of the second month of treatment to inform shared decision-making regarding whether or not to continue efinaconazole for nine additional months. OCT's ability to evaluate onychomycosis outcome in patients on topical efinaconazole both earlier and more reliably than nonimaging variables may improve the care given to and reduce the cost of onychomycosis for millions of patients., Competing Interests: DISCLOSURES: The authors report no conflicts of interest relevant to the content of this article., (Copyright © 2021. Matrix Medical Communications. All rights reserved.)

Mobile applications (apps) have been a growing part of medicine for the last decade. Our cross-sectional online survey studied the role of apps in dermatology resident training. The demographic results and response rate suggest that our study sample is representative of the target population of dermatology residents in America. Our survey highlights the increasing role of apps in dermatology resident training, differences in priorities among different years of residency, and differences in information utilization between sexes. This knowledge should help guide standardization, quality assurance, and formal integration of medical mobile apps into traditional dermatology teaching.

During the past decade, noninvasive imaging has emerged as a valuable tool in clinical dermatology and dermatologic research. Optical coherence tomography (OCT) is one such type of noninvasive imaging. OCT uses the principle of interferometry to produce real-time images. A low-power diode laser shines infrared light onto tissues, which reflects back to an optical fiber interferometer. Using time delay and the backscattered light intensity, a two-dimensional image akin to an ultrasound is rendered. We review the history, types, and modalities of OCT, plus the many applications of frequency domain, high definition, and dynamic OCT in practice, including its utility in diagnosis, monitoring, and grading disease severity in a variety of cutaneous conditions., Competing Interests: Conflict of interest The authors declare no conflict of interest., (Copyright © 2021. Published by Elsevier Inc.)

Although the complexity of health-related applications (apps) has evolved, they have not been adequately regulated or monitored for quality. We review the primary literature behind and regulation of apps that impact dermatologists, with a focus on the 3 most prevalent dermatology-related apps used by dermatology residents in the United States: VisualDx, UpToDate, and Mohs Surgery Appropriate Use Criteria. These apps are widely utilized but have not undergone approval by the 3 main government agencies responsible for regulating mobile medical apps: the US Food and Drug Administration (FDA), Federal Trade Commission, and Office for Civil Rights. Health-related apps that target providers can be a valuable tool, but given their potential impact on human lives, they should be well regulated and evidence based. It is important that apps designed to assist in health care delivery are appropriately monitored and that physicians are aware of the rigor of review of the apps that they choose to use in clinical practice.

Nonmelanoma skin cancer (NMSC) is the most common malignancy worldwide, and the incidence continues to increase. Originally, treatment options for NMSCs largely relied on destructive and surgical methods. Basal cell carcinomas (BCCs) and squamous cell carcinomas (SCCs) commonly are treated with cryosurgery, electrodesiccation and curettage, or more definitive surgical options. Over time, topical agents such as 5-fluorouracil, imiquimod, ingenol mebutate, and various forms of aminolevulinic acid (ALA) for photodynamic therapy (PDT) were included for superficial lesions as well as field treatment. The development of oral hedgehog (Hh) inhibitors such as vismodegib offered a promising alternative to patients with advanced disease. Each treatment has its own specific indications and side effects, thus there is always room for novel therapeutic approaches. We review new and potential treatments for NMSCs since 2018 including topical sonidegib, cemiplimab, taladegib, posaconazole, radiation therapy (RT), combination RT with vismodegib, PDT, and laser therapies.

The use of computers or machines in medicine dates back to the 1960s. Deep learning software programming is a subset of artificial intelligence (AI) based on the ability of a machine to learn from data and adaptively change. Deep learning is creating the next industrial revolution across the economy by replacing repetitive low-skilled tasks with learning algorithms. In medicine, image-based fields such as radiology, dermatology, and pathology have seen an increase in the number of studies using deep learning. However, given the current lack of standardized data sets to train these machines, it is difficult to predict if the present results eventually will be translated to real-life clinical settings.

The increasing incidence of nonmelanoma skin cancer (NMSC) poses a serious public health concern. Standard care for basal cell carcinoma (BCC) requires patients to attend multiple visits for diagnosis and treatment. This pilot study describes a model of care that aims to alleviate some of the demand placed both on the specialty and on patients by utilizing a novel same-day approach to BCC management with noninvasive diagnosis, same-day treatment, and noninvasive imaging follow-up. This study evaluates the efficacy of the 1064-nm Nd:YAG laser for treating BCC while leveraging noninvasive imaging technology for diagnosis and confirmation of clearance.

Although Mohs micrographic surgery (MMS) is the gold standard for treatment of nonmelanoma skin cancers (NMSCs), laser management has been an emerging treatment option that continues to be studied. Nonablative laser therapy is a noninvasive alternative. This study used a combined pulsed dye laser (PDL) and fractional laser approach to treat basal cell carcinomas (BCCs) in conjunction with noninvasive imaging such as reflectance confocal microscopy (RCM) and optical coherence tomography (OCT) to enhance efficacy rates.

With the implementation of the new Medicare Physician Fee Schedule on January 1, 2019, it can be beneficial for all practitioners to grasp an understanding of how reimbursement is determined. With the new Physician Fee Schedule also came new relative value units (RVUs) and new billing codes. Biopsy codes, in particular, were changed to reflect the complexity of the sampling technique (ie, tangential, punch, incisional). In this article, we explain RVUs and how they determine reimbursement. This article also highlights changes and additions to billing codes, specifically for biopsies and telemedicine services.

Reflectance confocal microscopy (RCM) is a novel technology that provides noninvasive, in vivo imaging of the skin at nearly histologic resolution. In 2016, the US Centers for Medicare and Medicaid Services (CMS) established reimbursement codes for RCM image acquisition and for the reading and interpretation of images. The combination of RCM imaging with dermoscopy has improved the accuracy of skin cancer diagnosis while reducing the number of biopsies of benign skin lesions. With that, we are starting to see more dermatologists and dermatopathologists using RCM in clinical practice. This editorial is to serve as an introduction on RCM imaging with a focus on its usefulness in both the diagnosis and management of skin cancers. We end by briefly describing the characteristic RCM features of normal skin to serve as a building block for later cases that will explore both the benefits and drawbacks of incorporating RCM imaging for benign and malignant lesions.

As technology continues to advance, so too does its accessibility to the general population. Mobile applications (apps) have become a part of the medical field, with dermatology being no exception. There are various types of dermatology apps, including teledermatology, self-surveillance, disease guide, reference, dermoscopy, conference, education, photograph storage and sharing, and journal apps, and others. In this study, we examined the types of dermatology apps targeting patients and physicians that are most popular by analyzing their rankings in the Apple App Store. We also delved deeper into the perceived benefits of the ranked apps targeting patients and the impact of physician-targeted apps on the field of dermatology.

Digital dermoscopy refers to the acquisition and storage of digital images from a dermoscopic examination. In this article, we delve into the innovative world of digital dermoscopy with a review of its potential uses as well as some nuances of adapting this technology in a clinical setting, including sequential monitoring, teledermoscopy, and machine learning. We also discuss the acquisition and storage of dermoscopy images in accordance with the Health Insurance Portability and Accountability Act (HIPAA).

Dermoscopy is a non-invasive diagnostic technique that facilitates the visualization of surface and subsurface structures of the skin. It has been proven to be an essential tool in the diagnosis of both malignant and benign cutaneous lesions. In this article, we review some of the most recent and noteworthy advances in dermoscopy. In addition, we discuss Reflectance Confocal Microscopy (RCM) and Optical Coherence Topography (OCT), two non-invasive imaging devices that may be used alongside dermoscopy to improve diagnostic accuracy.

Skin cancer is the most commonly diagnosed cancer in the USA. Mohs micrographic surgery is a microscopically controlled surgical technique that excises lateral and deep surgical margins while also sparing function and achieving a good cosmetic outcome. Given the increasing incidence in skin cancer worldwide and its associated treatment costs, techniques are being developed to improve the time and cost efficacy of this procedure. The use of noninvasive imaging, both in vivo and ex vivo, has the potential to increase efficiency of diagnosis and surgical management of skin cancers. These devices are useful in delineating lateral and deep tumor margins prior to surgery in vivo as well as to detect residual tumor ex vivo virtually in real time.

OBJECTIVE: To determine whether actinic keratosis and photodamaged perilesional areas (field cancerization) treated successfully with topical ingenol mebutate gel 0.015% remained clear one year later, and to treat actinic keratosis and perilesional skin not treated one year earlier. DESIGN: Single-center, single-arm, open-label extension of an original clinical study completed one year earlier. SETTING: An outpatient clinic. PARTICIPANTS: Fifteen of the original 28 study patients enrolled in and who completed the extension phase. MEASUREMENTS: All treated and untreated lesions in the original study were evaluated clinically, dermoscopically, and with optical coherence tomography at Day 0 of the extension study. Previously untreated lesions were then treated with ingenol mebutate gel 0.015% for three days and reevaluated at Day 60. RESULTS: There was no significant increase in actinic keratoses over one year. The majority of actinic keratoses not treated in the original study were still present at the beginning of the extension study. Following treatment, 69 percent of these lesions cleared by Day 60 of the extension study, which was not significantly different from the 79 percent clearance observed in the original study. CONCLUSION: Ingenol mebutate 0.015% maintained clearance of lesions treated one year earlier. Optical coherence therapy demonstrated its reliability as a noninvasive mode of diagnosis for actinic keratosis as well as actinic damage in the surrounding areas of field cancerization. Optical coherence therapy also showed that previously untreated lesions exhibited similar clearance rates once treated with the medication., Competing Interests: FUNDING:This study was sponsored and funded by LEO Pharma. This material is the result of work supported with resources and the use of facilities at the VA New York Harbor Healthcare System. The contents do not represent the views of the United States Department of Veterans Affairs or the United States Government. DISCLOSURES:Dr. Siegel is on the board of directors for Caliber Imaging and Diagnostics Inc. and is a consultant and on the advisory board for Leo Pharmaceuticals. He is also a principle investigator for Michelson diagnostics. Dr. Markowitz is a consultant for Leo Pharmaceuticals and is a principle investigator for Michelson Diagnostics. Drs. Wang, Dr. Levine, Ms. Schwartz, Ms. Minhas, and Ms. Feldman report no financial conflicts relevant to the content of this article.

Optical coherence tomography (OCT) has emerged as a novel noninvasive imaging device that allows for the real-time, in vivo, cross-sectional imaging of skin morphology. OCT has increased imaging depth and field of view compared with reflectance confocal microscopy, at the cost of decreased cellular resolution. Frequency domain OCT, dynamic OCT (D-OCT), and high-definition OCT (HD-OCT) are useful in the diagnosis, treatment planning, and treatment monitoring of nonmelanoma skin cancers. Research is currently underway to assess the utilization of these devices in distinguishing between malignant and benign melanocytic lesions based on vascular patterns on D-OCT and cellular information on HD-OCT., (Copyright © 2017 Elsevier Inc. All rights reserved.)

Early diagnosis and treatment of melanoma improve survival. New technologies are emerging that may augment the diagnosis, assessment, and management of melanoma but penetrance into everyday practice is low. In the current health care climate, greater emphasis will be placed on the incorporation of technology for clinically suspicious pigmented lesions to facilitate better, more cost-effective management., (Copyright © 2017 Elsevier Inc. All rights reserved.)

Optical coherence tomography (OCT), an emerging noninvasive imaging modality, recently received category III Current Procedural Terminology (CPT) codes from the American Medical Association, enabling tracking of its use in the medical community. In this article, we review OCT imaging and its variant systems, discussing its applications and limitations for clinical use. Future directions of OCT technology and goals for obtaining category I CPT codes and reimbursement also are discussed.

Reflectance confocal microscopy (RCM) has recently received Category I Current Procedural Terminology (CPT) codes by the Centers for Medicare & Medicaid Services for reimbursement comparable to a skin biopsy. In this article, we present a review of RCM imaging and its benefits and limitations in diagnosis and treatment planning. We also comment on guidelines for receiving reimbursement for acquiring, reading, and interpreting RCM images.

Objective: The objective of this study was to assess the ability of optical coherence tomography to detect clinical and subclinical actinic keratoses confirmed by histopathology. The efficacy of ingenol mebutate treatment of actinic keratosis was also evaluated using optical coherence tomography, and correlation of treatment efficacy with severity of local skin reactions was determined., Design: Single-arm, open-label, split-face study., Setting: Hospital outpatient clinic., Participants: Male subjects (N=30) with seven actinic keratoses., Measurements: A suspected actinic keratosis and the normal-appearing, perilesional skin were imaged, biopsied for histopathologic analysis, and the results compared with the clinical and a blinded optical coherence tomography diagnosis. Treatment with ingenol mebutate gel 0.015% was randomly administered to three clinically suspected actinic keratoses and the perilesional skin; three additional, suspected actinic keratoses lesions and perilesional areas were left untreated. Clinical and optical coherence tomography images were obtained for all lesions. Severity of local skin reactions was recorded to evaluate the relationship between local skin reaction and treatment effect., Results: Optical coherence tomography analysis had a 100-percent (28/28) correlation with the clinical diagnosis of actinic keratosis and detected 16 of 22 (73%) histopathologically confirmed subclinical lesions from perilesional skin sites. By optical coherence tomography assessment, the clearance rate for clinically observed lesions was 76 percent for ingenol mebutate-treated areas versus 11 percent for untreated areas; the clearance rate for treated subclinical lesions was 88 percent versus 43 percent for untreated areas. Clearance rates did not vary with the severity of the local response., Conclusion: Optical coherence tomography is effective at detecting clinical and subclinical actinic keratoses and monitoring their response to treatment.

Background: Optical coherence tomography (OCT) is a technique that enables real-time in-vivo examination of tissue. This technology provides the clinician with the potential to use a non-invasive tool in the identification and diagnosis of many skin lesions. However, the diagnostic features of basal cell carcinoma have not yet been described with comparison to their histopathology., , Objectives: To identify and describe key features of basal cell carcinoma (BCC) and its subtypes as they present in multi-beam Swept Source - OCT (MSS-OCT), and to correlate those against conventional histopathology.
, Methods: A total of 40 lesions were assessed by MSS-OCT prior to biopsy. 60-slice OCT images of the lesions were obtained and correlated with histology sections taken in the same plane. OCT scans were assessed retrospectively by a panel to determine the OCT criteria for BCC and its subtypes.
, Results: The following diagnostic criteria were identified: hyporeflective ovoid structures (40/40), dark halo boundaries (38/40), epidermal thinning (28/40), and collagen compression (14/40). Lesional tissue also showed a destruction of layers when compared to the surrounding normal tissue. In addition to the shared criteria, other subtypes showed distinct diagnostic criteria.
, Conclusion: With its higher sensitivity, using MSS-OCT allowed for non-invasive, accurate identification of the key diagnostic features of BCC and its subtypes with high correlation to the histopathologic features found with biopsy. , , J Drugs Dermatol. 2016;15(5):545-550.

Non-invasive imaging devices are currently being utilized in research and clinical settings to help visualize, characterize, anddiagnose cancers of the skin. Speckle-variance optical coherence tomography (svOCT) is one such technology that offers considerable promise for non-invasive, real time detection of skin cancers given its added ability to show changes in microvasculature. We present four early lesions of the face namely sebaceous hyperplasia, basal cell skin cancer, pigmented actinic keratosis, and malignant melanoma in situ that each display different important identification markers on svOCT. Up until now, svOCT has mainly been evaluated for lesion diagnosis using transversal (vertical) sections. Our preliminary svOCT findings use dynamic en face (horizontal) visualization to differentiate lesions based on their specific vascular organizations. These observed patterns further elucidate the potential of this imaging device to become a powerful tool in patient disease assessment.

Objective: To determine the diagnostic accuracy of optical coherence tomography for basal cell carcinoma and the proportion of biopsies that could be avoided if optical coherence tomography is used to rule-in surgery., Design: Multicenter, prospective, observational study., Setting: Dermatology clinics., Participants: Consecutive patients with clinically challenging pink lesions suspicious for basal cell carcinoma., Measurements: Clinical, dermoscopic, and optical coherence tomography images were obtained for all subjects. At each stage, the clinician made a diagnosis (pathology + subtype if applicable), and assessed his/her own confidence in the diagnosis., Results: Optical coherence tomography significantly (p<0.01) improved sensitivity and specificity over clinical or dermoscopic evaluation. The percentage of correct diagnoses was 57.4 percent (clinical), 69.6 percent (dermoscopy), and 87.8 percent (optical coherence tomography). Optical coherence tomography significantly increased the certainty of diagnosis; clinicians indicated they were certain (>95% confident) in 17 percent of lesions examined clinically, in 38.6 percent examined with dermoscopy, and in 70 percent examined with optical coherence tomography. With the use of optical coherence tomography in the diagnosis of basal cell carcinoma, more than 1 in 3 patients could avoid a diagnostic biopsy., Conclusion: In a population of clinically challenging lesions, optical coherence tomography improved diagnostic certainty by a factor of four over clinical examination alone and improved diagnostic accuracy by 50 percent (57-88%). The addition of optical coherence tomography to other standard assessments can improve the false-positive rate and give a high degree of certainty for ruling in a positive diagnosis for basal cell carcinoma. A reduction of 36 percent in overall biopsies could be achieved by sending high certainty basal cell carcinoma positive optical coherence tomography diagnoses straight to surgery.