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Primary malignant melanoma of the urinary bladder
T Kojima1, T Tanaka, N Yoshimi
1First Department of Pathology, Gifu University School of Medicine, Japan.
Archives of Pathology & Laboratory Medicine
|November 1, 1992
Summary
This study reports a rare case of malignant melanoma in the urinary bladder associated with melanosis. The melanosis showed atypical cells, progressing to melanoma in situ, confirmed by HMB-45 immunohistochemistry.
Area of Science:
- Urology
- Oncology
- Dermatopathology
Background:
- Primary malignant melanoma of the urinary bladder is exceptionally rare.
- Melanosis, a condition involving melanin deposition, is infrequently associated with bladder melanoma.
Observation:
- A case of bladder-invasive malignant melanoma with co-existing melanosis was identified.
- The melanosis demonstrated melanocytic atypia, indicating a precursor to melanoma in situ.
Findings:
- Immunohistochemical analysis using the HMB-45 monoclonal antibody confirmed the diagnosis.
- This represents a novel observation of melanocytic atypia within melanosis progressing to in situ melanoma in the bladder.
Implications:
- Highlights the importance of thorough histopathological examination in suspected bladder neoplasms.
- Suggests a potential pathway for the development of primary bladder melanoma from atypical melanosis.
- Underscores the utility of HMB-45 in diagnosing such rare urological malignancies.