Search results for "Nevus"

Towards to deep neural network application with limited training data: synthesis of melanoma's diffuse reflectance spectral images

2019

The goal of our study is to train artificial neural networks (ANN) using multispectral images of melanoma. Since the number of multispectral images of melanomas is limited, we offer to synthesize them from multispectral images of benign skin lesions. We used the previously created melanoma diagnostic criterion p'. This criterion is calculated from multispectral images of skin lesions captured under 526nm, 663nm, and 964nm LED illumination. We synthesize these three images from multispectral images of nevus so that the p' map matches the melanoma criteria (the values in the lesion area is >1, respectively). Demonstrated results show that by transforming multispectral images of benign nevus i…

Pigmentācijas grūtniecības laikā un pēcdzemdību periodā

2022

Pigmentācijas ir viena no biežāk sastopamajām pārmaiņām grūtniecības laikā un pēcdzemdību periodā, kas var ietekmēt sievietes pašapziņu, un dzīves kvalitāti. Ir būtiski informēt sievietes par gaidāmajām pārmaiņām un palīdzēt izvairīties no tām. Darba mērķis ir noskaidrot biežāk sastopamos pigmentāciju veidus grūtniecēm un sievietēm pēcdzemdību periodā, apkopojot datus par pigmentāciju sastopamību sievietēm Latvijā, kā arī izvērtējot dzīves kvalitātes izmaiņas. Noskaidrot pigmentāciju attīstību, atkarībā no asins analīžu marķieriem, kuriem ir ietekme uz pigmentāciju, un to attīstību atkarībā no grūtniecības trimestra. Noskaidrot, vai nevusi jeb dzimumzīmes grūtniecības un pēcdzemdību periodā…

Giant Nevus Lipomatosus Cutaneous Superficialis

2019

Nevus Oligemicus on the Breasts: A Report of 2 Cases

2012

Evaluation of Skin Melanoma in Spectral Range 450-950 nm Using Principal Component Analysis

2013

Diagnostic potential of principal component analysis (PCA) of multi-spectral imaging data in the wavelength range 450-950 nm for distant skin melanoma recognition is discussed. Processing of the measured clinical data by means of PCA resulted in clear separation between malignant melanomas and pigmented nevi.

Clinical and histopathological study of the oral multifocal melanoacanthoma : a case report

2019

Melanoacanthoma is a blackened mucocutaneous lesion, mainly affecting individuals with dark skin and exhibiting rapid development. Differential diagnosis includes nevus, amalgam tattoo and melanoma. This article reports a case of a 53-year-old white woman, who exhibited multiple blackened lesions on the gingiva and upper lip. After incisional biopsy, the presence of numerous melanin-containing dendritic cells distributed throughout the epithelial thickness, which were S-100 (+), were observed microscopically. Final diagnosis was multifocal oral melanoacanthoma. Follow-up for 28 months has shown appearing of more lesions in gingiva and upper lip. Therefore, the importance of differential dia…

Descriptive Dermoscopic Study of Depigmentation in Melanocytic Nevi Without a Visible Halo

2011

Background and objectives: There are few cases described in the literature in which depigmentation of melanocytic nevi occurs without the appearance of halos. The aim of this study was to analyze the correlation between clinical and dermoscopic findings and to assess the usefulness of dermoscopy to identify possible markers of complete regression in melanocytic lesions. Materials and methods: A prospective, observational, descriptive study of 77 melanocytic lesions in 52 patients was undertaken over a 5-year period. Melanocytic lesions from patients who underwent periodic follow-up in the digital dermoscopy unit were analyzed if they had exhibited partial or total, permanent depigmentation …

Oral pigmented lesions: clinicopathologic features and review of the literature

2012

Diagnosis of pigmented lesions of the oral cavity and perioral tissues is challenging. Even though epidemiology may be of some help in orientating the clinician and even though some lesions may confidently be diagnosed on clinical grounds alone, the definitive diagnosis usually requires histopathologic evaluation. Oral pigmentation can be physiological or pathological, and exogenous or endogenous. Color, location, distribution, and duration as well as drugs use, family history, and change in pattern are important for the differential diagnosis. Dark or black pigmented lesions can be focal, multifocal or diffuse macules, including entities such as racial pigmentation, melanotic macule, melan…

Cerebriform sebaceous nevus: a subtype of organoid nevus due to specific postzygotic FGFR2 mutations.

2021

Background Postzygotic mutations in FGFR2 have been identified in mosaic forms of acne, keratinocytic epidermal nevi, nevoid acanthosis nigricans / rounded and velvety epidermal nevus and in two fetuses with papillomatous pedunculated sebaceous nevus (PPSN). Objectives To determine the clinical and genetic characteristics of children with cerebriform, papillomatous, and pedunculated variants of sebaceous nevi. Methods Infants diagnosed with sebaceous nevi characterized by a cerebriform, papillomatous, and/or pedunculated morphology over a 10-year period (2010 - 2019) at three pediatric dermatology centers in Switzerland and France were included in this case series. Clinical and histological…

Two-Step Digital Follow-up of Patients at High Risk for Melanoma: a Retrospective Analysis of 152 Patients

2021

Antecedentes: La dermatoscopia digitalizada (DD) ha demostrado mejorar la precisión en el diagnóstico del melanoma (MM) en pacientes de alto riesgo. La combinación de DD y fotografía corporal total (FCT) puede facilitar la detección de nuevas lesiones o la aparición de cambios macroscópicos precoces en lesiones previamente registradas. Objetivos: El objetivo del presente estudio fue determinar el número de biopsias necesarias para diagnosticar un MM y, las características clínicas y dermatoscópicas asociadas al diagnóstico de melanoma en pacientes en seguimiento, mediante DD y FCT, de lesiones pigmentadas. Pacientes y métodos: Se realizó un estudio retrospectivo de 152 pacientes con elevado…