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Background Purpose Methods Results Conclusions While there are established international consensuses on the delineation of pelvic lymph node regions (LNRs), significant inter‐ and intra‐observer variabilities persist. Contouring these clinical target volumes for irradiation in pelvic malignancies is both time‐consuming and labor‐intensive.The purpose of this study was to develop a deep learning model of pelvic LNRs delineation for patients with pelvic cancers.Planning computed tomography (CT) studies of 160 patients with pelvic primary malignancies (including rectal, prostate, and cervical cancer) were retrospectively collected and divided into training set (n = 120) and testing set (n = 40). Six pelvic LNRs, including abdominal presacral, pelvic presacral, internal iliac nodes, external iliac nodes, obturator nodes, and inguinal nodes were delineated by two radiation oncologists as ground truth (Gt) contours. The cascaded multi‐heads U‐net (CMU‐net) was constructed based on the Gt contours from training cohort, which was subsequently verified in the testing cohort. The automatic delineation of six LNRs (Auto) was evaluated using dice similarity coefficient (DSC), average surface distance (ASD), 95th percentile Hausdorff distance (HD95), and a 7‐point scale score.In the testing set, the DSC of six pelvic LNRs by CMU‐net model varied from 0.851 to 0.942, ASD from 0.381 to 1.037 mm, and HD95 from 2.025 to 3.697 mm. No significant differences were founded in these three parameters between postoperative and preoperative cases. 95.9% and 96.2% of auto delineations by CMU‐net model got a score of 1–3 by two expert radiation oncologists, respectively, meaning only minor edits needed.The CMU‐net was successfully developed for automated delineation of pelvic LNRs for pelvic malignancies radiotherapy with improved contouring efficiency and highly consistent, which might justify its implementation in radiotherapy work flow. [ABSTRACT FROM AUTHOR]

Objective: This study was performed with the aim to evaluate the results of the treatment of vaginal fistulas caused by pelvic malignancy and to present a new surgical technique. In this retrospective study, patients with vaginal fistula who have been treated in Ghaem and Omid Hospitals of Mashhad University of Medical Sciences from 2004 to 2020 were studied. The inclusion criteria were the patients whose fistulas were caused by malignant neoplasia with pelvic organ origin. The patients with fistulas caused by other causes were excluded from the study. Patients' information was collected from the electronic records and the hospital archives and also the information recorded by the surgeon. Results: Out of 26 patients with vaginal fistula caused by pelvic malignancies, 18 cases had enterovaginal fistula. Cancer of cervix (11 cases) was the most prevalent cancer. Time interval between the incidence of fistula and the onset of the disease was 43.5 months. About 16 patients had a history of radiotherapy before the onset of the fistula, and 23 cases had undergone surgery before the onset of fistula. About 11 patients were treated with resection, 8 patients with ostomy, and 5 with fistulized loop bypass. Discussion and conclusion: In cases of extensive pelvic involvement with a tumor, it is recommended to use intestinal bypass in fistula site with the technique provided in this article, since it controls the symptoms of the patient and has limited complications. [ABSTRACT FROM AUTHOR]

Radiotherapy is a commonly used modality in pelvic malignancies such as prostate, gastrointestinal, or gynecological, either as a primary treatment or an adjuvant post-surgery. Despite its positive impact on the prognosis of these patients, it was found in several studies that it contributes to insufficiency fractures in different sites of the pelvis, more commonly in the sacral ala. This is particularly true for elderly patients. There are several hypotheses on how radiotherapy affects bone health, as it destroys the bone matrix and causes obliterative vasculitis. Several imaging techniques, particularly magnetic resonance imaging (MRI), help detect the radiotherapy-induced fracture and distinguish it from metastases. Some modalities, such as intensity-modulated radiotherapy (IMRT) and brachytherapy, have decreased fracture risk by escaping the adjacent structures to the targeted organ. Pharmacological interventions such as amifostine and desferrioxamine are promising in terms of bone protection, which necessitates further studies to confirm their mechanism of action., Competing Interests: Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Elgendy et al.)