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porokeratosis

Tuesday 10 July 2012

PO

Definition: Porokeratosis is a specific disorder of keratinization that is characterized histologically by the presence of a cornoid lamella, a thin column of closely stacked, parakeratotic cells extending through the stratum corneum with a thin or absent granular layer.

Images

- Prominent hypekeratosis with well-developed cornoid lamellae in porokeratosis of Mibelli

Types

- classic porokeratosis of Mibelli
- disseminated superficial actinic porokeratosis
- disseminated superficial porokeratosis
- porokeratosis palmaris et plantaris disseminata
- linear porokeratosis
- punctate porokeratosis
- porokeratosis plantaris discreta

Microscopy

Porokeratosis has a characteristic histomorphologic feature known as a cornoid lamella .

See also

- epidermal anomalies