Acrokeratosis verruciformis in Adult
AKV typically presents with closely grouped verrucous papules on the dorsal hands and feet, elbows, and knees, with occasional punctate keratoses of the acral surfaces. Papules often develop in childhood and increase in number throughout adolescence. They can also be present at birth. Nails may also be affected, with changes including striations, subungual hyperkeratosis, and distal nail V-shaped nicking.
AKV arises from a single genetic defect to the ATP2A2 gene on chromosome 12 that affects calcium transport in the sarcoendoplasmic reticulum and leads to disordered keratinization. The pattern of inheritance of AKV is autosomal dominant with incomplete penetrance, so a positive family history may not always be present. Sporadic cases have also been reported. There is no sex or racial / ethnic predilection.
Much of the published research on AKV has explored its relationship to , as both conditions are caused by mutations in ATP2A2, making AKV and Darier disease allelic.
The natural course of the condition is chronic, without spontaneous remission. It is generally benign, but rare cases of malignant transformation to squamous cell carcinoma have been reported.
Q82.8 – Other specified congenital malformations of skin
400018004 – Acrokeratosis verruciformis of Darier disease
400085009 – Acrokeratosis verruciformis of Hopf
Differential Diagnosis & Pitfalls
- – Even in cases of multiple verrucae, the symmetrical distribution of AKV will not been seen.
- – Individual lesions may clinically resemble AKV. Distribution of lesions may assist with diagnosis, but biopsy may be needed for definitive diagnosis.
- – Thought to be allelic to AKV with classic clinical presentation of malodorous crusted papules coalescing into plaques in a seborrheic distribution. Other clinical findings may include leucodermic macules, cobblestone plaques in the mouth, and similar nail changes to AKV.
- – Rare autosomal recessive condition with diffuse verrucous lesions, which are at risk of developing squamous cell carcinoma due to human papillomavirus infection. Histology shows characteristic clear cell changes with small pyknotic nucleoli throughout the epidermis. Verrucous papules will occur in locations beyond dorsal hands and feet, which can be beneficial in excluding this diagnosis.