Introduction: Winging of scapula is defined as a failure of dynamic stabilizing structures that anchor the scapula to the chest wall, leading to prominence of the medial border of scapula. It could be primary, secondary, or voluntary. Primary winging could be true winging due to neuromuscular causes or pseudo-winging due to osseous or soft-tissue masses. A scapular osteochondroma is a very rare presentation site and causes pseudo-winging leading to pushing away of the scapula away from the chest wall presenting as medial border prominence. Here, we are reporting a rare case of a scapular osteochondroma causing a pseudo-winging of the scapula. Case Report: A 2-year-old male child presented with painless, immobile, and non-fluctuant swelling over the left scapular region, insidious in onset and progressive in nature. On examination, a non-tender, immobile swelling was palpable with a painless and unrestricted range of motion at the shoulder joint. After evaluating radiographs and CT scan, the patient was diagnosed to have a ventral scapular osteochondroma leading to pseudo-winging of the scapula. Conclusion: Despite the rarity, a differential diagnosis of a scapular osteochondroma should be kept in mind while examining a young child presenting with a winged scapula. Keywords: Scapula, osteochondroma, pseudo-winging.

Background: Osteochondroma is the most common benign skeletal neoplasm and is found most often in long bones, especially in the distal femur and proximal tibia. They usually present as painless swelling near the joint and can be complicated by mechanical irritation, compression or injury of adjacent structures, fracture, malignant transformation, and post-operative recurrence. Locking of the knee refers to flexion of the knee without complete extension and passive extension is limited resulting in significant pain. Excision is a successful form of the treatment for symptomatic osteochondromas. Case Report: A case of osteochondroma of the proximal tibia illustrates extra-articular cause of locked knee secondary to the incarceration of pes anserinus tendons by the lesion. Conclusion: Surgical excision of the bilobed pedunculated posteromedial proximal tibia osteochondroma and restoration of the gracilis and semitendinosis to its normal anatomic position resulted in the complete resolution of symptoms.