psoriasiform hyperplasia

(redirected from regular acanthosis)

psoriasiform hyperplasia

A nonspecific, histologically defined appearance that consists of regular elongation of rete ridges, suprapapillary thinning, mild spongiosis, telangiectasis of blood vessels in the papillary dermis and fusion of foot processes.

Seborrhoeic dermatitis, late secondary syphilis.


abnormal increase in volume of a tissue or organ caused by the formation and growth of new normal cells. Categorized as irregular, papillated, regular. See also myofiber hyperplasia.

myofiber hyperplasia
see myofiber hyperplasia.
papillated epidermal hyperplasia
increased thickness of the epidermis with projections above the surface of the skin.
pseudocarcinomatous epidermal hyperplasia
extreme, irregular thickening of the epidermis with increased mitoses, squamous eddies, and horn pearls which may mimic squamous cell carcinoma.
psoriasiform hyperplasia
has clubbed and fused rete ridges seen in epitheliotropic lymphoma, psoriasiform-lichenoid dermatosis of English springer spaniel dogs, parapsoriasis and acral lick dermatitis.
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Examination of the biopsy specimen obtained from the knee revealed regular acanthosis and hypogranulosis, mild spongiosis, and intraepidermal clusters of neutrophils (Munro's microabscess) in the epidermis, and the diagnosis of psoriasis was confirmed.
The histopathology from the lesion showed parakeratosis, some hyperkeratosis, regular acanthosis, suprapapillary thinning and neutrophilic exocytosis (Figure 2).
Histopathology from the lesion showed regular acanthosis and suprapapillary thinning.