Chondroblastic Osteosarcoma of the Lower Tibia: A case report

Abstract

steosarcoma is a bone tumor that can occur in any bone. It most commonly occurs in the long bones of the extremities near metaphyseal growth plates. The most common sites are femur (42%), tibia (19%), and humerus (10%). Other locations include the skull or jaw (8%) and pelvis (8%). A number of variants of osteosarcoma include conventional types (i.e osteoblastic, chondroblastic, fibroblastic types) and telangiectatic, multifocal, parosteal, and periosteal types. Case ReportA 13 year-old boy came to our out-patient department with pain of the left ankle for 3 weeks duration. He was consulting a local practitioner for the same problem and got some relief after taking nonsteroidal anti-inflammatory drugs. There was no history of trauma, evening rise of temperature, weight loss, or loss of appetite. On examination, the left ankle had a mild to moderate swelling in the distal end of the tibia. It was not warm, but tender on palpation. There was no bony crepitus or abnormal mobility felt in the distal end of left tibia. His blood parameters including lactate dehydrogenase (LDH) and Alkaline Phosphatase were within normal limits. Radiographs showed a large sclerotic lesion, soft tissue permeation in the lower end of tibia with elevation of the periosteum (Codman triangle) and extension of the lesion through the periosteum resulting in a sunburst appearance. (Figs. 1 and 2)