1. Desmoplastic Melanomas Mimicking Neurofibromas.
- Author
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Gerami P, Kim D, Zhang B, Compres EV, Khan AU, Yazdan P, Guitart J, and Busam K
- Subjects
- Adult, Aged, Aged, 80 and over, Antigens, Neoplasm analysis, Biomarkers, Tumor analysis, Biopsy, Diagnosis, Differential, Diagnostic Errors, Female, Humans, Illinois, Immunohistochemistry, Intermediate Filaments pathology, Male, Melanoma chemistry, Melanoma surgery, Middle Aged, Neoplasm Recurrence, Local, Neurofibroma chemistry, Neurofibroma surgery, New York City, Phenotype, Predictive Value of Tests, Skin Neoplasms chemistry, Skin Neoplasms surgery, Time Factors, Treatment Outcome, Tumor Suppressor Protein p53 analysis, Melanoma pathology, Neurofibroma pathology, Skin Neoplasms pathology
- Abstract
Desmoplastic melanoma can be difficult to diagnose and on average have a significantly higher T stage at the time of diagnosis compared with conventional melanomas. Histologically, these tumors typically consist of spindle cells in a fibrous matrix. The spindle cells may display fibroblast and/or Schwann cell-like features. In this study, we describe the features of 12 cases of desmoplastic melanoma closely simulating neurofibroma. Although the spindle cells in these tumors may be indistinguishable from those of neurofibroma, features such as prominent fibroplasia (12/12), poor lateral circumscription (8/9), diffuse infiltration of subcutaneous tissue (7/9), and lymphoid aggregates (10/12) may be helpful clues to the diagnosis. No immunohistochemical markers were reliable in distinguishing neurofibroma-like desmoplastic melanomas from neurofibroma. Clinical follow-up was available in 8 cases, of which 4 were initially misdiagnosed as benign neoplasms and given no further re-excision. All 4 of these cases recurred; 2 of which showed transformation to a more aggressive phenotype.
- Published
- 2020
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