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5 results on '"Theodoros Petsas"'

1. The impact of Platelet Rich Plasma (PRP) in osseointegration of oral implants in dental panoramic radiography: texture based evaluation

Author

Panagiotis I. Georgakopoulos, Panagiotis Korfiatis, Ioannis P Georgakopoulos, Francesco Martelli, George Panayiotakis, Elena Fanti, Theodoros Petsas, Stavros Tsantis, M. Martelli, and Lena Costaridou

Subjects
Dental panoramic, Test group, business.industry, Platelet-rich plasma, Radiography, Contact region, Dentistry, Medicine, Bone formation, Original Article, business, Immediate implant, Osseointegration
Abstract

Summary Purpose . In this study the temporal texture differentia tion associated with the bone formation properties, around loaded oral implants after Platelet Rich Plasma (PRP) employment, was investigated in Panoramic Radi ographs. Materials and methods . Thirty eligible patients are ran domly assigned to two groups. The test group received PRP application around new implants, while in the con trol group no PRP treatment was made. The bone-to-im plant contact region was analyzed in a clinical sample of 60 Digitized Panoramic Radiographs, 30 corresponding to immediate implant loading (Class-I) and 30 after an 8 month follow-up period (Class-II). This region was sam pled by 1146 circular Regions-of-Interest (ROIs), result ing from a specifically designed segmentation scheme based on Markov-Random-Fields (MRF). From each ROI, 41 textural features were extracted, then reduced to a subset of 4 features due to redundancy and employed as input to Receiver-Operating-Characteristic (ROC) analy sis, to assess the textural differentiation between two classes. Results . The selected subset, achieved Area-UnderCurve (AUC) values ranging from 0.77-0.81 in the PRP group, indicating the significant temporal textural differ entiation has been made. In the control group, the AUC values ranged from 0.56-0.68 demonstrating lesser os seo integration activity. Conclusion . This study provides evidences that PRP ap plication may favor bone formation around loaded dental implants that could modify the dental treatment plan ning.

Published
2014

2. A case of hepatocellular carcinoma arising within large focal nodular hyperplasia with review of the literature

Author

Irene Tsota, Dionisios Karavias, Athanassios C. Tsamandas, Chrysoula Karatza, Theodoros Petsas, Vassilios Vassiliou, and Dimitrios Kardamakis

Subjects
Adult, Pathology, medicine.medical_specialty, Carcinoma, Hepatocellular, business.industry, Liver Neoplasms, Gastroenterology, Focal nodular hyperplasia, Case Report, General Medicine, medicine.disease, Diagnosis, Differential, Solitary lesion, Focal Nodular Hyperplasia, Hepatocellular carcinoma, Carcinoma, Medicine, Humans, Hepatic tumor, Female, Differential diagnosis, business, Young female
Abstract

Focal nodular hyperplasia (FNH) is a relatively rare benign hepatic tumor, usually presenting as a solitary lesion; however, multiple localizations have also been described. The association of FNH with other hepatic lesions, such as adenomas and haemangiomas has been reported by various authors. We herein report a case of a hepatocellular carcinoma arising within a large focal nodular hyperplasia, in a young female patient.

Published
2006

4. Multidetector computed tomography versus platelet/spleen diameter ratio as methods for the detection of gastroesophageal varices.

Author

Karatzas A, Triantos C, Kalafateli M, Marzigie M, Labropoulou-Karatza C, Thomopoulos K, Petsas T, and Kalogeropoulou C

Abstract

Background: All patients with liver cirrhosis should undergo screening endoscopy, but there are limitations and this approach places a heavy burden upon endoscopy units. The aim of this study was to compare multidetector computed tomography (MDCT) and the platelet/spleen diameter ratio as non-invasive methods for the detection of gastroesophageal varices., Methods: The study included 38 cirrhotics who underwent upper gastrointestinal (GI) endoscopy and MDCT within one month. Two radiologists reviewed the scans, in order to determine the presence and the size of varices. Blood tests and measurement of the spleen maximum diameter were also carried out and the platelet/spleen diameter ratio was calculated. Endoscopy was considered the gold standard and the results of the two methods were compared to it., Results: Varices were detected by upper GI endoscopy in 24 of 38 patients. The mean sensitivity and specificity of MDCT for the two observers was 86.1% and 57.1% respectively. In patients with large varices (>5 mm), the sensitivity was 100% (4/4). Using 909 as a cut-off value of the platelet/spleen diameter ratio this method yielded a sensitivity of 56.5% and a specificity of 35.7%. The difference in sensitivity and specificity between the two methods was statistically significant P<0.05., Conclusion: MDCT was accurate for the detection of gastroesophageal varices, especially those with clinically significant size (>5 mm), and superior to platelet/spleen diameter ratio. MDCT could replace, in selected patients, upper GI endoscopy as a method for detecting gastroesophageal varices in cirrhotic patients.

Published
2016

5. Hepatic artery aneurysm complicating intra-arterial chemotherapy for hepatocellular carcinoma.

Author

Evangelos T, Vassiliki P, Dimitrios K, and Theodoros P

Subjects
Aged, Aneurysm diagnostic imaging, Angiography, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Carcinoma, Hepatocellular diagnostic imaging, Disease Progression, Humans, Iatrogenic Disease, Liver Neoplasms diagnostic imaging, Male, Palliative Care, Aneurysm complications, Carcinoma, Hepatocellular drug therapy, Hepatic Artery diagnostic imaging, Infusions, Intra-Arterial, Liver Neoplasms drug therapy
Abstract

We present a rare case of asymptomatic hepatic artery aneurysm that developed during therapy in a 65-year-old man who received hepatic intra-arterial chemotherapy for an inoperable hepatocellular carcinoma. The aneurysm remained unchanged although the intra-arterial chemotherapy was continued for five more cycles after its appearance.

Published
2003

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