نتایج جستجو برای: benign melanocytic lesions
تعداد نتایج: 228650 فیلتر نتایج به سال:
PURPOSE To report an experience with fine-needle aspiration biopsy of selected small melanocytic choroidal tumors during the interval from April 13, 1983, through January 19, 2001. METHODS Retrospective descriptive case series report of 34 patients with a small melanocytic choroidal tumor (maximal diameter, < or = 10 mm; thickness, > or = 1.5 mm but < or = 3 mm) evaluated diagnostically by tr...
Computer-aided diagnosis (CAD) systems based on deep learning approaches are now feasible due to the availability of big data and powerful computational resources.The medical image-based CAD great interest in numerous diseases, but especially for skin cancer diagnosis, models have been mostly developed dermoscopy images. Models clinical images few, mainly unavailability volumes relevant data. H...
Ocular melanocytic lesions comprise a spectrum of lesions ranging from benign nevi to invasive melanoma. Clinical and histopathological appearance of conjunctival lesions ranges from freckle to lentigo and to nevi. Between these types, conjunctival nevi and conjunctival melanosis are the most frequent. Conjunctival and uveal melanocytes are derived from the neural crest, as their cutaneous coun...
BACKGROUND The negative pigment network (NPN) is seen as a negative of the pigmented network and it is purported to be a melanoma-specific structure. OBJECTIVES We sought to assess the frequency, sensitivity, specificity, and odds ratios (ORs) of NPN between melanoma cases and a group of control lesions. METHODS Digitalized images of skin lesions from 679 patients with histopathological dia...
HN: halo nevi RN: recurrent nevi RCM: reflectance confocal microscopy INTRODUCTION Melanocytic nevi change throughout a person’s life. Most melanocytic nevi are acquired during childhood and early adulthood; in later life, the prevalence of melanocytic nevi falls. Nevi frequently form, but the exact mechanisms involved in their generation remain unknown. Nevi usually progressively fade or, less...
Inflammatory infiltrates are frequently present in melanocytic lesions, with different distribution and composition. Much attention has been devoted to tumor-infiltrating lymphocytes (TIL) the tumor microenvironment, establishing their prognostic predictive value many malignancies, including melanoma. However, lymphocytes, albeit most numerous consistent presence, constitute only part of immune...
This paper presents a computer-aided analysis of pigmented skin lesions following the ABCD guidelines used by Dermatologists. There are 3 steps to this process: image segmentation, feature analysis and machine learning. The most important and foundational step is image segmentation. In this paper we present 3 lesion segmentation algorithms: Radial Search, Region Growing Search using Flood Fill ...
Some cutaneous melanocytic lesions are notoriously difficult to diagnose by histopathology. For that reason, the Pathology Panel of the Dutch Melanoma Working Party was instituted and is regularly approached to provide an expert opinion on problem cases. In order to identify the most common diagnostic problems, 1069 consecutive referral cases of submitted lesions (1992 to 1994 inclusive) were a...
Congenital melanocytic naevi can give rise to secondary melanocytic tumours, such as proliferative nodules and malignant melanoma. The clinical and histological features of both lesions may be nearly identical, which makes an unequivocal diagnosis impossible. In particular, it is difficult to differentiate clearly between benign and malignant proliferation in infants with secondary melanocytic ...
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