A 38 year old male presented with a painful non mobile, bony hard swelling of lower end of Right femur of 6 month duration. The swelling was present since 6 months with progressive increase in size of the swelling, size of swelling was peanut shape when the patient noticed it 1st time and it gradually increased to lemon size over the period of 6 months. Initially the swelling was painless nut since last 2 months patient started having pain which was aggravated by knee movements over anterior aspect of distal third of thigh.
Clinical examination revealed a bony hard swelling arising from anterolateral aspect of lower end of femur away from the knee joint. The swelling was painful on knee movements.
MRI revealed rounded bony outgrowth on anterior aspect of distal femur of size 20*12mm having mass effect on quadriceps tendon. A diagnosis of benign exostoses lower end femur was made. In view of sudden increase in size of the lesion and associated pain on knee movements, and mechanical obstruction Patient underwent surgical excision of the exostoses. Histopathology revealed osteochondroma & no malignant transformation.