Large neglected ulcerated melanoma mimicking extramedullary plasmacytoma.

Abstract

Amelanotic melanoma, a renowned impersonator, has taken on a new persona. A 63-year-old woman was seen in the emergency room with a chief complaint of back pain after a fall and was discovered to have a 15-cm fungating mottled gray mass independent of bone on the right elbow. Initial workup discovered lytic calvarial lesions, anemia (Hb 7; Hct 20%), and circulating plasma cells consistent with plasma cell myeloma. Biopsy of the elbow mass displayed sheets of plasmacytoid cells, some reactive for CD138. Flow cytometry revealed a substantial portion of the plasma cells in the tumor that were kappa restricted consistent with cutaneous plasmacytoma. The elbow mass was initially signed out as extramedullary involvement by her myeloma. Reevaluation of the mass after the patient experienced an explosive growth of multinodular jet black malignant melanoma on ipsilateral breast revealed MART-1 and S-100 reactivity of the majority of the cells. In retrospect, the elbow mass was a neglected primary amelanotic malignant melanoma with neoplastic plasma cells participating in its chronic inflammatory infiltrate.

• Authors: Larisa M Lehmer, Bruce D Ragsdale, Michael V Frost, Kevin L Ferguson
• Journal: The American Journal of dermatopathology (Am J Dermatopathol) Vol. 33 Issue 8 Pg. e94-8 (Dec 2011) ISSN: 1533-0311 [Electronic] United States
• PMID: 22008718 (Publication Type: Case Reports, Journal Article)

Chemical References

• Biomarkers, Tumor

Topics

• Biomarkers, Tumor (analysis)
• Biopsy
• Breast Neoplasms (chemistry, secondary)
• Diagnostic Errors
• Fatal Outcome
• Female
• Flow Cytometry
• Humans
• Immunohistochemistry
• Melanoma, Amelanotic (chemistry, secondary)
• Middle Aged
• Multiple Myeloma (chemistry, pathology)
• Plasma Cells (chemistry, pathology)
• Plasmacytoma (chemistry, pathology)
• Predictive Value of Tests
• Skin Neoplasms (chemistry, pathology)
• Skin Ulcer (pathology)