Osteoid Osteoma of the Calcaneus and Patella: A Report of Two Cases and Review of the Literature.

The presence of an osteoid osteoma (OO) in the calcaneus and patella remains an uncommon condition. These lesions can often lead to diagnostic and therapeutic difficulties. Initial assessment and cautious management contribute to excellent results and limited complications. We report a 20-year-old male with OO of the calcaneus and a 35-year-old male with OO of the patella. The clinical suspicion, in combination with thorough imaging control, can lead to the final diagnosis. Imaging examinations usually reveal a nidus; however, computed tomography remains the gold-standard tool for the detection and diagnosis of lesions. The state-of-the-art therapeutic methods emphasize minimally invasive techniques. The unusual location of these tumors emphasizes the specific need for careful management and minimally invasive treatment, which ultimately contributes to excellent outcomes with minimal adverse effects.