RESUMO
Patellar tumors are rare and are usually benign as opposed to malignant tumours. The most frequent benign lesions of patella are giant cell tumor (common in adults), chondroblastoma and osteoid osteoma. A solitary exostosis is the most common benign bone tumor which occurs around the growth plate of long bones. The treatment of choice is extra periosteal resection of exostosis and ensuring complete removal of cartilaginous cap. Indications of surgery are when the exostosis is interfering or disturbing the growth of extremity, malignant transformation, presence of bone erosion, neurovascular compression, interference with joint motion, bursitis, fracture through the stalk and cosmesis. We report a rare case in an adult patient with an extra-articular skeletal osteochondroma of the patella located antero - superiorly which presented as an enlarged bursa and a bony swelling over knee joint.