Recurrent squamous cell carcinoma arising in a neglected pilonidal sinus: report of a case and literature review.

Squamous cell carcinoma (SCC) is a rare complication observed mainly in chronic, recurrent and untreated primary pilonidal disease. It is associated with poor prognosis, and its recurrence rate after surgery is high. Here we present a patient diagnosed with SCC arising from a neglected pilonidal sinus.