2020 Volume 36 Issue 2 Pages 159-163
Case 1: A 12-year-old girl consulted our orthopedics department with a chief complaint of a bulge in her proximal left upper arm. X-ray and MRI showed an osteochondroma of the proximal humerus. Repeated X-rays were obtained at 8-month follow up and showed near complete regression of the lesion. Case 2: A 16-year-old boy presented with painful swelling of the left distal thigh. He was diagnosed with osteochondroma by X-ray. MRI showed inflammation around the tumor. He was followed up with conservative treatment. By one year later, the tumor had regressed.
Osteochondromas are the most common benign tumors of bone. Most are discovered at 5–15 years of age. Because many osteochondromas are completely asymptomatic and unrecognized, their true incidence is unknown and the natural history is poorly understood. Their growth usually parallels that of the patient and usually ceases when skeletal maturity is reached. There are some reports about spontaneous regression of osteochondroma and its spontaneous regression is considered a rare phenomenon so far. However, spontaneous regression of osteochondroma may not be a rare phenomenon in childhood and adolescence.
