Malignant melanoma with a myxoid stroma: a diagnostic pitfall on fine-needle aspiration biopsy.
Journal Article (Journal Article)
Malignant melanoma (MM), both primary and metastatic, may be associated with a prominent myxoid stromal reaction causing diagnostic confusion on fine-needle aspiration biopsy (FNAB), most often with sarcomas that demonstrate a myxoid stroma, particularly malignant peripheral nerve sheath tumor (MPNST). We present a case of a 32-yr-old man with no past medical history who presented with a unilateral neck mass clinically suspicious for lymphoma. FNAB produced a specimen composed of large sheets of anaplastic cells encased in a myxoid stroma that was S100 and vimentin-positive but HMB-45-negative. A diagnosis of MPNST was made. Excision demonstrated a metastatic MM of unknown primary, with a prominent myxoid stromal reaction. A repeat HMB-45 was again negative. Electron microscopy demonstrated intracytoplasmic melanasomes and cisternae of rough endoplasmic reticulum with intracisternal parallel tubules, confirming the diagnosis. Although HMB-45 is typically negative in both tumors, S100 should be strongly positive in myxoid MM and only focal in MPNST.
Full Text
Duke Authors
Cited Authors
- Elliott, D; Pitman, MB
Published Date
- September 2001
Published In
Volume / Issue
- 25 / 3
Start / End Page
- 185 - 190
PubMed ID
- 11536443
International Standard Serial Number (ISSN)
- 8755-1039
Digital Object Identifier (DOI)
- 10.1002/dc.2034
Language
- eng
Conference Location
- United States