Trichostasis spinulosa within an intradermal melanocytic nevus.
A thirty-six-year-old man presented with a melanocytic nevus on his left shoulder. The lesion was excised and histopathologic examination showed an intradermal nevus with several infundibular cysts among the nevus cells. These cysts showed a cyst wall with epidermoid keratinization and a lumen filled by many cross-sectioned hair shafts. These findings were consistent with a diagnosis of trichostasis spinulosa within an intradermal melanocytic nevus. We note the relationship between these two disorders in the same lesion.
Department of Dermatology, Hospital Universitario San Carlos, Facultad de Medicina, Universidad Complutense, Madrid, Spain.
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Sánchez Yus
D000328:Adult; D006201:Hair Diseases / Q000150:complications* / Q000473:pathology; D006801:Humans; D008297:Male; D009508:Nevus, Pigmented / Q000150:complications* / Q000473:pathology; D012878:Skin Neoplasms / Q000150:complications* / Q000473:pathology