TITLE : “ Primary ” aggressive chondroblastoma of the humerus : a case report

Background: Chondroblastomas are rare epiphyseal bone tumors. Very few cases of extra-cortical aggressive soft tissue invasion or metastasis are reported. Case presentation: We report a 28 year old adult male who presented with a large swelling over left shoulder region. Pre-operative imaging revealed a large tumor arising from upper end of humerus with extensive soft tissue involvement necessitating a fore-quarter amputation. Patient received adjuvant radiation. Conclusions: This patient is one of the largest chondroblastomas to be reported. Although chondroblastomas are typically benign, rarely they can be locally aggressive or metastatic. Early diagnosis and institution of proper primary therapy would prevent mutilating surgeries and recurrences.