Metastatic Melanoma to a Neurofibroma.
Journal
The American Journal of dermatopathology
ISSN: 1533-0311
Titre abrégé: Am J Dermatopathol
Pays: United States
ID NLM: 7911005
Informations de publication
Date de publication:
01 Sep 2022
01 Sep 2022
Historique:
pubmed:
28
4
2022
medline:
20
8
2022
entrez:
27
4
2022
Statut:
ppublish
Résumé
We present an extraordinary case of metastatic cutaneous melanoma to a pre-existing neurofibroma in a 75-year-old man with a history of primary invasive melanoma in an anatomically close vicinity. Histological examination of the metastatic melanoma showed a well-circumscribed intradermal nodule of frankly malignant epithelioid melanocytes without an intraepidermal component, surrounded and sharply demarcated from a diffuse spindle cell proliferation with morphological features of a neurofibroma. The spindle cell component showed bland cytologic features, with no mitotic activity or lymphocytic inflammation and no features of malignancy. By immunohistochemistry, both components expressed S100, while HMB45 positivity and complete loss of p16 were only observed in the epithelioid cells. The morphologically distinct areas were analyzed by fluorescent in situ hybridization, which demonstrated an abnormal profile (gain of RREB1 and homozygous loss of CDKN2A) in the epithelioid nodule; however, no abnormalities were detected in the spindle cell component. Next-generation sequencing showed somatic NRAS and PTEN mutations in the melanoma cells only. The overall molecular findings supported the immunomorphological diagnosis of metastatic melanoma within a neurofibroma over the potential differential diagnosis of melanoma with a neurofibroma-like spindle/desmoplastic component.
Identifiants
pubmed: 35475788
doi: 10.1097/DAD.0000000000002199
pii: 00000372-202209000-00010
doi:
Types de publication
Case Reports
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
683-686Informations de copyright
Copyright © 2022 Wolters Kluwer Health, Inc. All rights reserved.
Déclaration de conflit d'intérêts
The authors declare no conflicts of interest.
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