2. CASE REPORT
A 19-year-old male presented with swelling, chronic pain and a palpable
mass in the anteroinferior region of the left knee, and after
examination with the help of lateral radiography of the left knee
(Figure 1), with irregularities in the inferior of patella joint surface
and multiple exostosis was observed in the patellar tendon region. The
tumor lesion had sharp borders and a hyper-dense appearance, and no
signs of fracture or dislocation were observed in the tibiofemoral and
patellofemoral joints.
After surgery of the left knee joint, radical resection of the mass and
proximal osteotomy of the left tibia, 3 irregular bone masses with total
dimensions of 7 × 5 × 1 cm were sent for histopathological examination.
In histopathological evaluation, well-differentiated trabeculae-spongy
bone tissue, containing proliferated chondroid and osteoid areas in
hypodense lacunae which covered with fibro-fatty tissue and thick
hyaline cartilage was observed (Figure 2). This evaluation also
confirmed multiple exostosis in the patellar tendon. After 3 months of
follow-up, the patient had no movement disorders related to flexion and
extension of the knee joint, pain and tumor lesion.