Clear cell chondrosarcoma calcaneum - a case report and review of literature.

Chondrosarcoma is the second most common primary bone malignancy accounting for 20-25% of all bone sarcomas. However chondrosarcoma of the foot is rare with just a handful of cases being described. Among the subtypes clear cell variant is the rarest and has never been documented in the foot. We present a rare case of clear cell chondrosarcoma of the calcaneum with multiple metastases that was treated at our institute. The patient was a 62-year old male who presented to us with pain and mass in the left hindfoot with difficulty in walking for 2 years and a discharging ulcer over the lateral aspect for 4 months. Radiography showed aggressive, destructive, lytic lesion in the calcaneum with cortical breach and soft tissue invasion. Bone scan and PET-CT revealed multiple bony metastases and lung metastasis. After initial biopsy, patient underwent below knee amputation and has been in remission since the last 18 months. Given the rarity of this tumor in the calcaneum, this report highlights the importance to consider the possibility of this tumor in the calcaneum as an early diagnosis; complete metastatic workup and expeditious management can thus significantly improve prognosis.