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Diagnostic confusion resulting from CD56 expression by cutaneous myeloid sarcoma
Thanh Ho1, Franklin Sedarat, Nagesh Rao
1Department of Pathology and Laboratory Medicine and.
Rare Tumors
|December 9, 2010
Summary
Myeloid sarcoma, a rare cancer, can present as an ear mass and mimic other skin tumors due to unusual CD56 expression. Accurate diagnosis is crucial, especially when it is the only sign of acute myeloid leukemia.
Area of Science:
- Oncology
- Pathology
- Dermatology
Background:
- Myeloid sarcoma is a malignant proliferation of myeloid blasts in extramedullary tissues.
- Cutaneous involvement is a recognized, though less common, presentation of myeloid sarcoma.
- Early and accurate diagnosis is critical for patient management and prognosis.
Observation:
- A patient presented with an earlobe mass and facial nerve paralysis, initially suspected to be Merkel cell tumor.
- Malignant cells within the mass showed aberrant CD56 expression, contributing to diagnostic uncertainty.
- The patient's presentation was the sole manifestation of acute myeloid leukemia.
Findings:
- Pathological evaluation confirmed the diagnosis of myeloid sarcoma.
- The myeloid sarcoma exhibited aberrant CD56 expression and the characteristic translocation t(8;21).
- Aberrant antigen expression in cutaneous myeloid sarcomas can lead to misdiagnosis.
Implications:
- This case highlights the importance of comprehensive pathological assessment for diagnosing cutaneous myeloid sarcomas.
- Awareness of aberrant antigen expression is crucial to avoid misdiagnosis, particularly differentiating from other skin neoplasms.
- Recognizing myeloid sarcoma as the sole presenting sign of acute myeloid leukemia is vital for timely initiation of leukemia treatment.
