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Melanocytic nevi

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https://www.readbyqxmd.com/read/29138058/the-diagnostic-value-and-histologic-correlate-of-distinct-patterns-of-shiny-white-streaks-for-the-diagnosis-of-melanoma-a-retrospective-case-control-study
#1
Anna Eliza Verzi, Victor L Quan, Kara Walton, Mary C Martini, Ashfaq A Marghoob, Erin M Garfield, Betty Kong, Maria Cristina Isales, Timothy VandenBoom, Bin Zhang, Dennis West, Pedram Gerami
BACKGROUND: Shiny white streaks (SWS) are best visualized with polarized dermoscopy, and correlate with dermal fibroplasia histopathologically. SWS have been described at higher frequencies in melanomas than benign nevi. OBJECTIVE: We assessed the diagnostic value of different patterns of SWS and their histologic correlate in melanocytic lesions. METHODS: Polarized dermoscopic images of 1507 histopathologically diagnosed melanocytic neoplasms were analyzed for presence and pattern of SWS...
November 11, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/29138054/keratinocyte-sonic-hedgehog-up-regulation-drives-the-development-of-giant-congenital-nevi-via-paracrine-endothelin-1-secretion
#2
Arash Chitsazan, Blake Ferguson, Rehan Villani, Herlina Y Handoko, Pamela Mukhopadhyay, Brian Gabrielli, Wolter J Mooi, H Peter Soyer, Duncan Lambie, Kiarash Khosrotehrani, Grant Morahan, Graeme J Walker
Giant congenital nevi are associated with clinical complications such as neurocutaneous melanosis and melanoma. Virtually nothing is known about why some individuals develop these lesions. We previously identified the sonic hedgehog (Shh) pathway regulator Cdon as a candidate nevus modifier gene. Here we validate this by studying Cdon knockout mice, and go on to establishment the mechanism by which Shh exacerbates nevogenesis. Cdon knockout mice develop blue nevi without the need for somatic melanocyte oncogenic mutation...
November 11, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29128985/resection-of-melanocytic-nevi-as-a-potential-treatment-of-anti-nmdar-encephalitis-patients-without-tumor-report-of-three-cases
#3
Hexiang Yin, Chenyu Zhu, Haitao Ren, Xunzhe Yang, Bin Peng, Liying Cui, Tao Qu, Hongzhi Guan
The most common underlying tumor associated with anti-N-methyl D-aspartate-receptor (NMDAR) encephalitis is ovarian teratoma. Resection of the underlying tumor may decrease exposure of autoantigen and make for faster response of immunotherapy and less relapse frequency. Similar to teratoma, expression of NMDAR in human epidermal melanocytes was suspected recently. The dense melanocytes in melanocytic nevus may serve as potential autoantigens and are prone to increase relapse frequency in the tumor-negative patients...
November 11, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/29128957/expression-of-glut-1-in-malignant-melanoma-and-melanocytic-nevi-an-immunohistochemical-study-of-400-cases
#4
Miroslav Důra, Kristýna Němejcová, Radek Jakša, Michaela Bártů, Ondřej Kodet, Ivana Tichá, Romana Michálková, Pavel Dundr
The glucose transporter-1 (Glut-1) is a cell membrane glycoprotein involved in glucose uptake. An increased expression of Glut-1 is an important cell adaptation mechanism against hypoxia. An upregulation of Glut-1 can be found in several types of malignant tumors, which are able to reprogram their metabolism from oxidative phosphorylation to aerobic glycolysis (Warburg effect). However, the data regarding melanocytic lesions is equivocal. We performed comprehensive immunohistochemical analysis of the Glut-1 expression in 225 malignant melanomas (MM) and 175 benign nevi...
November 11, 2017: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/29125708/integration-of-dermoscopy-and-reflectance-confocal-microscopy-for-distinguishing-melanomas-from-nevi-of-the-breast-area
#5
V D Mandel, C Bombonato, R Pampena, A Kyrgidis, S Borsari, E Benati, M Mirra, S Piana, G Pellacani, C Longo
BACKGROUND: Nevi of special sites encompass a class of benign lesions characterized by the presence of atypical clinical and histopathologic features that can be difficult to distinguish from melanoma. Dermoscopy and reflectance confocal microscopy may improve the clinical assessment of melanocytic lesions in order to avoid unnecessary excisions. OBJECTIVES: The aim of this study was to assess the value of specific dermoscopic and confocal criteria in distinguishing melanomas from nevi of the breast area...
November 10, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29118524/collision-tumor-between-trichofolliculoma-and-melanocytic-nevus
#6
Christel Bolte, Roberto Cullen, Ivo Sazunic
Trichofolliculoma (TF) is a hamartomatous hair follicle-related tumor, clinically described as a dome-shaped papule with a central pore crossed by one or more silky white hairs. Histologically, it described as a cystic cavity containing keratinous debris, hair shaft fragments, and numerous hair follicles arising from its linings. Collision or compound tumors are a coexistence of two or more identifiable tumors in the same lesion. We present a case of a 47-year-old man with a lesion on his left cheek clinically characterized as a TF...
October 2017: International Journal of Trichology
https://www.readbyqxmd.com/read/29115737/reinterpreting-dermoscopic-pigment-network-with-reflectance-confocal-microscopy-for-identification-of-melanoma-specific-features
#7
B De Pace, F Farnetani, A Losi, S Ciardo, N De Carvalho, Anna M Cesinaro, L Reggiani Bonetti, J Chester, S Kaleci, E Del Duca, Steven P Nisticò, C Longo, G Pellacani
BACKGROUND: Pigment network is an important dermoscopic features for melanocytic lesions but alterations in grid line thickness are also observed in melanomas. OBJECTIVE: To investigate features of thick, thin and mixed pigment networks at dermoscopy and their respective features at Reflectance Confocal Microscopy (RCM) for differential diagnosis, correlated with histology METHODS: All melanocytic lesions with histological diagnosis, evaluated between January 2010 - May 2014, were enrolled and classified according to dermoscopy evaluation of the pigment network; thin, thick and mixed...
November 8, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29109715/specific-detection-of-serum-antibodies-against-bkpyv-a-small-dna-tumour-virus-in-patients-affected-by-choroidal-nevi
#8
Silvia Pietrobon, Ilaria Bononi, Francesca Lotito, Paolo Perri, Sara Violanti, Elisa Mazzoni, Fernanda Martini, Mauro G Tognon
Ocular or choroidal nevus (CN) is a rare benign neoplastic lesion of the eye. The cause of CN onset/progression, which arises from the transformation of ocular melanocytes, is not known. A fraction of CN patients may develop uveal melanoma. The objective of this study was to investigate the association between CN and BK polyomavirus (BKPyV), a small DNA tumor virus. Serum IgG antibodies which react with BKPyV antigens were analyzed. An indirect E.L.I.S.A. using synthetic peptides that mimic BKPyV antigens was employed...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29106699/immunohistochemical-expression-of-vitamin-d-receptor-in-melanocytic-nevi-and-cutaneous-melanoma-a-case-control-study
#9
C Del Puerto, C Navarrete-Dechent, M Molgó, C A Camargo, A Borzutzky, S González
BACKGROUND: Vitamin D (VD) deficiency is associated with higher risk of cancer, possibly due to anti-proliferative, anti-angiogenic, pro-apoptotic, cell-differentiating and anti-invasive effects. The anti-carcinogenic role of VD in melanoma is still a matter of debate. Loss of nuclear and cytoplasmic vitamin D Receptor (VDR) expression in melanoma cells has been reported. OBJECTIVE: To analyze VDR immunohistochemical expression in benign dermal nevi (DN) and MM...
November 6, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/29094145/population-based-analysis-of-histologically-confirmed-melanocytic-proliferations-using-natural-language-processing
#10
Jason P Lott, Denise M Boudreau, Ray L Barnhill, Martin A Weinstock, Eleanor Knopp, Michael W Piepkorn, David E Elder, Steven R Knezevich, Andrew Baer, Anna N A Tosteson, Joann G Elmore
Importance: Population-based information on the distribution of histologic diagnoses associated with skin biopsies is unknown. Electronic medical records (EMRs) enable automated extraction of pathology report data to improve our epidemiologic understanding of skin biopsy outcomes, specifically those of melanocytic origin. Objective: To determine population-based frequencies and distribution of histologically confirmed melanocytic lesions. Design, Setting, and Participants: A natural language processing (NLP)-based analysis of EMR pathology reports of adult patients who underwent skin biopsies at a large integrated health care delivery system in the US Pacific Northwest from January 1, 2007, through December 31, 2012...
November 1, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/29091921/melanin-pigments-in-the-melanocytic-nevus-regress-spontaneously-after-inactivation-by-high-hydrostatic-pressure
#11
Michiharu Sakamoto, Naoki Morimoto, Chizuru Jinno, Atsushi Mahara, Shuichi Ogino, Shigehiko Suzuki, Kenji Kusumoto, Tetsuji Yamaoka
We report a novel treatment for giant congenital melanocytic nevi (GCMN) that involves the reuse of resected nevus tissue after high hydrostatic pressurization (HHP). However, the remaining melanin pigments in the inactivated nevus tissue pose a problem; therefore, we performed a long-term observation of the color change of inactivated nevus tissue after HHP. Pressurized nevus specimens (200 MPa group, n = 9) and non-pressurized nevus tissues (control group, n = 9) were subcutaneously implanted into nude mice (BALB/c-nu) and then harvested 3, 6, and 12 months later...
2017: PloS One
https://www.readbyqxmd.com/read/29079183/gene-expression-signature-as-an-ancillary-method-in-the-diagnosis-of-desmoplastic-melanoma
#12
Loren E Clarke, Jason D Pimentel, Hillary Zalaznick, Lu Wang, Klaus J Busam
Desmoplastic melanoma (DM) is a rare fibrosing variant of melanoma that can be difficult to diagnose. One of the diagnostic challenges is its distinction from a melanocytic nevus with desmoplasia. Here we investigate the use of a 23-gene signature, which has previously been shown to distinguish benign from malignant melanocytic neoplasms. We assessed 50 cases with a differential diagnostic consideration of desmoplastic melanoma that underwent gene expression testing. Hematoxylin and eosin (H&E)-stained sections were reviewed and the final cohort included 20 DM, five non-desmoplastic melanomas, and 27 desmoplastic melanocytic nevi...
October 24, 2017: Human Pathology
https://www.readbyqxmd.com/read/29077988/laser-treatment-of-congenital-melanocytic-nevi-a-systematic-review
#13
REVIEW
C A M Eggen, J E Lommerts, E J van Zuuren, J Limpens, S G M A Pasmans, A Wolkerstorfer
Recent studies on congenital melanocytic nevi (CMN) indicate a lower risk for melanoma than assumed for many years. As a result, the treatment paradigm in CMN shifted from complete removal to cosmetically acceptable, less invasive treatment options such as laser treatment. Our objective was to systematically review the efficacy and safety of laser therapy for CMN. We searched MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials (CENTRAL) and PubMed. We rated the quality of evidence with the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach...
October 27, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/29077579/acquisition-of-somatic-nras-mutations-in-central-nervous-system-melanocytes-a-predisposing-risk-factor-to-primary-melanoma-of-the-central-nervous-system-a-frequently-forgotten-pitfall-in-congenital-nevi
#14
Maria C Garrido, Lidia Maroñas-Jiménez, Carlos Morales-Raya, Yolanda Ruano, Jose L Rodriguez-Peralto
Congenital melanocytic nevi (CMN) are benign melanocytic proliferations that are usually present at birth. A somatic mosaicism for an NRAS point mutation is responsible for the several phenotypic abnormalities that may be associated with congenital nevi. We report the case of a 7-year-old boy with a proliferative nodule (PN) arising in a Giant CMN completely excised and with several visceral and intraspinal melanoma metastases with no evidence of primary cutaneous melanoma. The careful analysis of the clinical, morphologic, and molecular features allowed the distinction of between the benign PN (BPN) and the melanoma...
October 17, 2017: American Journal of Dermatopathology
https://www.readbyqxmd.com/read/29076319/serial-tissue-expansion-at-the-same-site-in-pediatric-patients-is-the-subsequent-expansion-faster
#15
Moon Ki Lee, Seong Oh Park, Tae Hyun Choi
Background: Serial tissue expansion is performed to remove giant congenital melanocytic nevi. However, there have been no studies comparing the expansion rate between the subsequent and preceding expansions. In this study, we analyzed the rate of expansion in accordance with the number of surgeries, expander location, expander size, and sex. Methods: A retrospective analysis was performed in pediatric patients who underwent tissue expansion for giant congenital melanocytic nevi...
October 26, 2017: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/28982585/a-prospective-study-evaluating-the-utility-of-a-2-mm-biopsy-margin-for-complete-removal-of-histologically-atypical-dysplastic-nevi
#16
Vitaly Terushkin, Elise Ng, Jennifer A Stein, Susan Katz, David E Cohen, Shane Meehan, David Polsky
BACKGROUND: Complete removal of individual dysplastic nevi (DN) is often accomplished by a second surgical procedure after the initial biopsy. The choice to perform the second procedure is strongly influenced by histopathologic margin status of the initial biopsy specimen. OBJECTIVE: To evaluate the clinical and histopathologic outcomes of in toto biopsy of DN using a predetermined margin of normal skin. METHODS: We conducted a prospective study of a saucerization method using a defined 2-mm margin in patients undergoing biopsy of a pigmented skin lesion...
September 16, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28978033/mysm1-2a-dub-is-an-epigenetic-regulator-in-human-melanoma-and-contributes-to-tumor-cell-growth
#17
Christina Wilms, Carsten M Kroeger, Adelheid V Hainzl, Ishani Banik, Clara Bruno, Ioanna Krikki, Vida Farsam, Meinhard Wlaschek, Martina V Gatzka
Histone modifying enzymes, such as histone deacetylases (HDACs) and polycomb repressive complex (PRC) components, have been implicated in regulating tumor growth, epithelial-mesenchymal transition, tumor stem cell maintenance, or repression of tumor suppressor genes - and may be promising targets for combination therapies of melanoma and other cancers. According to recent findings, the histone H2A deubiquitinase 2A-DUB/Mysm1 interacts with the p53-axis in hematopoiesis and tissue differentiation in mice, in part by modulating DNA-damage responses in stem cell and progenitor compartments...
September 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28976087/noninvasive-diagnosis-in-dermatology
#18
Julia Welzel, Sandra Schuh
In addition to dermoscopy, there are other imaging and biophysical methods for the noninvasive diagnosis of skin lesions. Confocal laser microscopy allows for high-resolution imaging of the epidermis and upper dermis. It is particularly suitable in the differential diagnosis of melanocytic lesions. Optical coherence tomography (OCT) has a lower resolution compared to confocal laser microscopy but a greater depth of penetration. It is primarily used for imaging epithelial skin cancer, especially in the context of monitoring the effectiveness of nonsurgical therapies...
October 2017: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/28966529/eruptive-melanocytic-nevi-without-any-trigger-in-a-5-year-old-healthy-girl
#19
Won-Ku Lee, Hyunju Jin, Hyang-Suk You, Woo-Haing Shim, Jeong-Min Kim, Gun-Wook Kim, Hoon-Soo Kim, Hyun-Chang Ko, Byung-Soo Kim, Moon-Bum Kim
No abstract text is available yet for this article.
October 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28942405/congenital-melanocytic-nevus-mimicking-a-turban-tumour-in-an-18-year-old-filipino-male
#20
Maria Elinor Grace Sison, Eileen Cubillan, Bernard U Tansipek
Congenital melanocytic nevi (CMN) are nevi that are present at birth or arise within the first few weeks of life. They are often found on the trunk, head and neck and extremities. We report herein an unusual presentation of a CMN as a cerebriform tumour presenting as secondary cutis verticis gyrata on the scalp of an 18-year-old Filipino male.
September 23, 2017: BMJ Case Reports
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