| Verruciform xanthoma
(VX) is a rare, benign, mucocutaneous,
nondestructive lesion characterized by proliferation of non-Langerhans
lipid-rich histiocytes.
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Xanthelasma ;
Gastric Xanthoma Human papillomavirus has been indicated in several cases of VX
as a causative agent. Cases have been reported in immunocompromised
patients with HIV-1 infection and graft versus host disease.
VX may be
associated with epidermal nevi, fibroepithelial polyp of the vulva,
squamous cell carcinoma, arteriovenous hemangioma, discoid lupus
erythematosus and lymphedema of the leg.
Site:
Predominantly noted in the oral cavity, but it has
been reported to occur on the genital skin and mucosa (vulva, perianal
skin, scrotum, penis).
Gross:
Usually solitary,
flat plaques or warty lesions (about 2 cm in diameter).
Microscopic features:
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Hyperkeratosis,
focal parakeratosis & verrucous acanthosis.
Exocytosis of
neutrophils into the upper layer of epithelium and the parakeratotic
scales.
Characteristic feature:
Presence of numerous xanthoma cells in the papillary dermis. Cells
contain lipid and small amounts of PAS-positive diastase resistant
material.
Immunohistochemistry
: The characteristic foam cells of verruciform xanthoma
showed strong positive staining for CD 68[KP1] and vimentin & weak
positivty for cytokeratin. S100 protein is negative.
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