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Anetodermic pilomatricoma.

Elemir M de Souza¹, Andrelou F Ayres Vallarelli, Maria L Cintra

¹Dermatology Service, School of Medicine, State University of Campinas, São Paulo, Brazil.

Journal of Cutaneous Pathology

|August 22, 2008

Summary

A pilomatricoma, a rare hair matrix tumor, can present with unusual skin changes like anetoderma. This case highlights the varied clinical and histological features of pilomatricoma in a young patient.

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Area of Science:

Dermatology
Pathology

Background:

Pilomatricoma (calcifying epithelioma of Malherbe) is an uncommon benign skin tumor arising from hair matrix cells.
Clinically, it typically presents as a solitary, firm nodule, but overlying skin changes can alter its appearance.

Observation:

A rare case of pilomatricoma with associated anetoderma was observed on the lower extremity of a 12-year-old girl.
Histological examination revealed a thinned dermis with myxomatous changes and a deep tumoral mass.

Findings:

The pilomatricoma mass consisted of basaloid cells, shadow cells, and calcified areas.
Discrete inflammatory and foreign-body reactions were noted around the tumor.
Anetodermic changes were present despite the absence of clear triggering factors within the pilomatricoma.

Implications:

This case expands the understanding of pilomatricoma's variable clinical presentations.
It suggests that anetodermic changes can be associated with pilomatricoma, even without identifiable specific causes.
Highlights the importance of thorough histological evaluation for diagnosing pilomatricoma and associated conditions.