Abstract

Background: Chondrosarcoma is a rare malignant tumor of the bone. Secondary chondrosarcoma originating from a primary osteochondroma is extremely rare and the data show that the reported incidence of shoulder osteochondroma is very low. We report the case of a 28 yr old male patient with Chondrosarcoma secondary to malignant transformation of an Osteochondroma of left shoulder. The patient was diagnosed with left shoulder Osteochondroma 7 years back for which tumour excision was done. He currently presented with a 20 x 20 x 15 cm swelling over the left scapular region since two years. MRI of Shoulder revealed a large expansile altered signal intensity lesion arising from the left scapula. Biopsy showed roughly cartilaginous appearance and was diagnosed to be well differentiated Chondrosarcoma. Patient was therefore a candidate for a large resection. HRCT thorax was done which showed no parenchymal lung lesion. Intra-operatively, Glenoid capsule, superior and lateral cord of Brachial plexus was involved. Histopathology showed secondary low grade Chondrosarcoma of scapula with all resected margins free of tumour. He is now at 1 year of surgical resection, and is doing well with restriction in movements at shoulder joint . 

Keywords: Chondrosarcoma , osteochondroma , scapula