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Malignant melanoma developing from an intradermal nevus
M Hashiro1, T Miyamoto, S Sonoda
1Department of Dermatology, Kansai Rohsai Hospital, Hyogo, Japan.
Dermatology (Basel, Switzerland)
|July 21, 1998
Summary
This rare case report details a malignant melanoma originating from an intradermal nevus. The melanoma cells grew upward from the nevus, a unique presentation not previously documented in medical literature.
Area of Science:
- Dermatology
- Oncology
- Pathology
Background:
- Malignant melanoma is a serious skin cancer.
- Intradermal nevi are common benign skin growths.
- Melanoma development from intradermal nevi is exceptionally rare.
Observation:
- A 58-year-old male presented with a black nodule and satellite lesions near the umbilicus.
- Clinical and histopathological examination was performed.
- Microscopic findings revealed melanoma cells originating from an intradermal nevus.
Findings:
- The diagnosis was malignant melanoma arising from an intradermal nevus.
- Histopathology showed upward growth of melanoma cells from the nevus.
- No junctional activity was observed, differentiating it from typical melanoma development.
- This upward growth pattern is distinct from previously reported cases, which showed downward growth.
Implications:
- This case expands the understanding of melanoma development pathways.
- Highlights the importance of thorough histopathological examination of pigmented lesions.
- Suggests that intradermal nevi can be a precursor to melanoma through unusual growth patterns.