European Journal of Biomedical and Pharmaceutical Sciences

CHONDROBLASTOMA WITH SECONDARY ANEURYSMAL BONE CYST

Sayeed M.U, Sehrish S., Sarwar M*, and Kumuda C

ABSTRACT

A devastating rare tumor chondroblastoma (calcified giant cell tumor, chondromatous osteoclastoma) is a cartilage forming tumor which occurs commonly in individuals below the age of 20 years. Males are affected more frequently with a ratio of 2:1. Most common site of tumor is epiphyseal end of long bones before the epiphyseal cartilage disappears; in distal end of femur, proximal end of humerus, proximal end of tibia. Sometimes it arises in metaphysis or arises in epiphysis and extend into metaphysis. On imaging the tumor is seen as a well delineated lytic lesion with areas of rarefaction. The reason behind presenting this case is that Chondroblastoma with Secondary Aneurysmal bone cyst is rare. Case Presentation: 21 year male presented with complains of pain in the left shoulder since 2 years. He was asymptomatic 2 years back, developed pain in left shoulder during lifting of weight which increases gradually. On examination there is a tenderness over the joint line without any inflammatory signs. There is limitation of movement of joint when abducting beyond 90 and in flexion beyond 30. X ray shows an expansile mass in the upper end of humerus. CT scan shows a lytic lesion in the epiphysis of left humerus. Excision and curettage with femoral head bone grafting was performed. The tumor was sent for histopathology. Histopathological studies were performed and Chondroblastoma with Secondary Aneurysmal Bone Cyst was diagnosed. Chondroblastoma with aneurysmal bone cyst is very rare. Present study suggests that this tumor should be included in the differential diagnosis of any lytic lesion of bone.

Keywords: Chondroblastoma, Aneurysmal bone cyst, lytic lesion.