digital fibrokeratoma

Synopsis

 tuber : pedunculated to dome shaped nodule on acral skin
 polypoid lesion
 hyperplastic epidermis
 variably acanthotic epidermis with hyperkeratosis / hyperkeratotic orthokeratosis
  dermal anomalies : dense collagen fibers and variable amounts of mature fibroblasts, small blood vessels and elastic tissue
 thickened collagen in dermis is oriented predominantly in the vertical direction
 stellate stromal cells may be present
 Lesion merges with adjacent normal dermis
 neural structures are absent or inconspicious
 Lacks adnexal structures

Predisposition

 Koenen tumor in tuberous sclerosis - tuber

Differential diagnosis

 tuberous tumors

• tuberous dermal melanocytic naevus

See also

  cutaneous anomalies