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Trichilemmal cyst nevus: a new complex organoid epidermal nevus.

Tantcheva-Poor I, Reinhold K, Krieg T, Happle R

Department of Dermatology, University of Cologne, Cologne, Germany.

A 31-year-old woman had an organoid nevus characterized by multiple trichilemmal cysts arranged in a bandlike pattern. The involved streaks followed Blaschko's lines and were covered, in addition, by multiple filiform hyperkeratoses and comedo-like plugs. Some histopathologic features of this complex nevus were reminiscent of those of well-established organoid nevi such as nevus comedonicus, porokeratotic eccrine nevus, or hair follicle nevus, but the presence of multiple large trichilemmal cysts was a conspicuously distinctive abnormality. Consequently, we propose for this new organoid nevus the names "trichilemmal cyst nevus" or "nevus trichilemmocysticus."

Published 23 October 2007 in J Am Acad Dermatol, 57(5): S72-7.
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