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Palmar melanotic macules. A sign of neurofibromatosis
Abstract:
Multiple melanotic macules of varying sizes were present on the palmar surfaces of 42 of 50 consecutive South Indian patients with von Recklinghausen's disease. The histologic characteristics of the macules showed localized areas of fingerlike prolongations of the rete ridges with increased pigmentation of the basal cells. This epidermal change overlies a small neurofibroma accompanied by thick-walled blood vessels in the reticular dermis. A clinicopathologic correlation of these palmar melanotic macules constitutes yet another frequent and specific marker of classical neurofibromatosis.
Insights
Palmar melanotic macules are common in South Indian patients with von Recklinghausen
Area of Science:
- Dermatology
- Pathology
- Genetics
Background:
- Von Recklinghausen's disease, also known as neurofibromatosis type 1 (NF1), is a genetic disorder.
- Skin manifestations are common in NF1, but palmar involvement is less frequently emphasized.
Purpose of the Study:
- To investigate the prevalence and clinicopathologic features of palmar melanotic macules in South Indian patients with NF1.
- To determine if these macules are a specific marker for classical neurofibromatosis.
Main Methods:
- Observational study of 50 consecutive South Indian patients diagnosed with von Recklinghausen's disease.
- Clinical examination of palmar surfaces for melanotic macules.
- Histopathologic examination of biopsied macules.
Main Results:
- Multiple melanotic macules were observed on the palmar surfaces of 42 out of 50 patients (84%).
- Histology revealed fingerlike rete ridge prolongations with basal cell hyperpigmentation, overlying small neurofibromas and thick-walled dermal blood vessels.
- These findings suggest a specific epidermal and dermal reaction pattern.
Conclusions:
- Palmar melanotic macules are a frequent and specific clinical marker in South Indian patients with classical neurofibromatosis (von Recklinghausen's disease).
- The clinicopathologic correlation supports their utility in diagnosing NF1.