A cystic lesion with dense fibrosis in wall lined by hyperkeratotic stratified squamous epithelium. Lumen shows some keratin flakes. Cyst wall looks deficient in some areas with related dense infiltration by lymphocytes, plasma cells, neutrophils and scattered foreign body giant cells, No evidence of malignancy.
Occipital mass? schwannoma.
Soft tissue mass measured 3.3x3x2.5 cm, showing cyst measured 3x2.8 cm, filled with brownish fluid.
Occipital mass, excision: