Subcutaneous tissue shows a sinus tract partially lined by stratified squamous epithelium with related infiltration by neutrophils, lymphocytes, macrophages and plasma cells with abscess formation. No evidence of specific granulomas. No evidence of malignancy.
Perianal infected sinus.
One fatty soft tissue piece measuring 3.5 x 3 x 2 cm covered partly by skin measuring 2 x 1 cm with fatty cut surface.
Perianal lesion, excision biopsy: