Squamous cell carcinoma arising in epidermal inclusion cyst of breast: a diagnostic dilemma.

Epidermal, or inclusion, cysts are frequently seen benign lesions that are lined with stratified squamous epithelium. Malignant transformation of these is rare, occurring in 0.011% to 0.045% cases [1]. We herein report an unusual case of squamous cell carcinoma occurring in an epidermal cyst of the breast in a middle aged lady.