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Multiple agminated juvenile melanoma arising on a hyperpigmented macule
1Department of Dermatology, Iwate Medical University, School of Medicine, Japan.
The Journal of Dermatology
|October 1, 1993
Summary
Multiple agminated juvenile melanoma (MAJM) is a rare condition. This case report details MAJM developing on a hyperpigmented macule, suggesting it
Area of Science:
- Dermatology
- Pathology
- Pediatric Oncology
Background:
- Juvenile melanomas are rare melanocytic neoplasms.
- Nevus spilus, a congenital hyperpigmented macule, can rarely present with atypical melanocytic proliferation.
Observation:
- A 1-year-old boy presented with multiple small nodules on a congenital hyperpigmented macule on his right shoulder.
- The patient had nine distinct nodules within the lesion.
Findings:
- Histopathological examination revealed nests of spindle-shaped melanocytes in the epidermis and at the dermoepidermal junction within the nodules.
- The underlying hyperpigmented macule showed increased melanin in the basal layer and small nests of epithelioid cells.
Implications:
- This case suggests that multiple agminated juvenile melanoma (MAJM) arising on a hyperpigmented macule may represent a specific subtype of nevus spilus.
- Further research is needed to understand the developmental pathway and clinical behavior of this rare presentation.