Metastatic or metachronous adamantinoma: An Enigma

Adamantinoma is an uncommon tumour of low grade malignancy in terms of biologic aggressiveness; metastasis occurring many years after amputation. A young male underwent an above knee amputation of left leg for adamantinoma of tibia. He returned with pain and swelling in his right thigh five years later. Investigations revealed an adamantinoma in the diaphysis of the right femur. The unusual presentation of this adamantinoma at an uncommon site threw up interesting insights into the nature of this lesion. In particular, the metachronous origin of the adamantinoma in the femur is discussed in this report.