Subcutaneous tissue showing cystic lesion with fibrotic wall and lining by hyperkeratotic stratified squamous epithelium. Lumen of cyst is full of keratin flakes. Cyst wall looks deficient in some areas with related dense inflammatory reaction. Inflammation extends to subcutaneous fat. No evidence of malignancy.
Perianal bloody discharge from a suspected pilonidal sinus.
Soft tissue piece measured 4.5x3x2.5 cm, partially covered by skin measuring 3.5 cm, with fatty cut section.
Perianal lesion, excision: