Extraskeletal Mesenchymal Chondrosarcoma of Shoulder: An Extremely Rare Case

INTRODUCTION Extraskeletal chondrosarcoma (EMC) is a rare, aggressive neoplasm which has been seen in the soft tissue area. This soft tissue sarcoma is classified to myxoid and mesenchymal based on histologic criteria. The mesenchymal subtype has a poor prognosis. In approximately 50% of patient with EMC, we could observe soft tissue lesion and stippled calcification in the conventional radiography. CASE REPORT In the current paper, we introduced a 47-year-old Iranian male patient having painless, mobile, nontender, and firm mass in left shoulder. We did not find neurovascular disturbance at the upper extremity, and the patient had a full range of motion in the left shoulder. The tumor was treated with wide resection and followed by radiation therapy. CONCLUSION Complete wide resection of mesenchymal chondrosarcoma could be enough as an initial treatment and chemotherapy reserved for patients that have unresectable masses. Apparently, the main key in the treatment is the surgical resection, and this process is the most important method in their management.