Multifocal benign chondroblastomas: report of a case.

Benign chondroblastoma is an unusual solitary bone tumor occurring usually in the second decade in a long bone. The tumor is often sited on epiphyseal cartilages. Very few examples of malignant variants have been documented, although local recurrence of benign tumors is not unusual. We wish to report a patient who developed two chondroblastomas in two distinct anatomical sites (tibia and calcaneus) over the space of seven years, with no clinical or histological features of malignant disease.