Osteochondroma - femur

Case contributed by Zentout Sofiane
Diagnosis almost certain

Presentation

Swelling on the medial side of the left thigh.

Patient Data

Age: 13 years
Gender: Male
ct

CT demonstrates pedunculated bony exostosis arises from the medial aspect of the distal femoral diaphysis, with cortical medullary continuity, mass effect with a displacement of vastus medialis muscle, no displacement of femoral vessels, there is no soft tissue masse associated, no pathological fracture, or lytic lesion.

Case Discussion

Osteochondroma, is the most common benign bone tumor, accounting for 40% of all benign bone tumors, 10-15% of all bone tumors and affects 3% of the entire population, which can be sessile or pedunculated. Osteochondromas are usually solitary (in 85% of cases), or multiple (in 15% of cases) as part of a-hereditary multiple exostoses (HME).

Osteochondromas occur most frequently between 10 and 30 years and usually occur in the metaphysis of long bones. Osteochondromas can arise in the epiphysis in Trevor disease. Most osteochondromas are asymptomatic lesions. 

Complications included bony deformities, fractures, vascular injury and nerve compression, bursal formation and bursitis, and malignant transformation (the incidence of malignant transformation arising in solitary osteochondromas is less than 1% and 2 to 25 % in patients with HME).

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