MACROSCOPIC DESCRIPTION: "R 4th finger trans ROI core Bx": Five linear tissue cores ranging in length between 4mm and 12mm, each 1mm in diameter. A1. (GS)

MICROSCOPIC DESCRIPTION: Thickly keratinized epidermis, dermis and subcutaneous tissue. Within subcutaneous tissue is a cellular lesion incorporating numerous numerous multinucleate giant cells. There is no cellular atypia or necrosis. No mitoses are identified. No bone is identified. The lesion extends to biopsy edges.

DIAGNOSIS: Right 4th finger lesion: Giant cell tumor.