Introduction –

Giant cell tumor (GCT) of bone is generally a benign tumor composed of mono–nuclear stromal cells and characteristic multinucleated giant cells. It usually develops in long bones of the lower extremity especially around the knee, but can occur in unusual locations. Aneurysmal bone cyst(ABC) is a benign cystic lesion of bone that is composed of blood–filled spaces separated by connective tissue.

Aims & Objectives –

To study tumors of calcaneum with osteoclast like giant cells with differential diagnosis including benign and malignant lesion .

Result –

Histopathological features are suggestive of giant cell tumor with aneurysmal bone cyst like  changes of calcaneum along with clinical and radiological findings.

Conclusion –

GCT with secondary ABC is a rare presentation though it can be diagnosed by its characteristic microscopic findings.