Relevance: Osteochondroma (osteocartilaginous exostosis) is the most common benign neoplasm of bone tissue, accounting for up to 9% of all bone tumors. Possible manifestations of a single osteochondral exostosis are pain, limited range of motion, compression of vascular or neural structures, and crepitus. The literature describes several clinical examples of the treatment of patients with osteochondral exostosis of the proximal radius. A feature of the anatomy of the proximal radius is the close location of such anatomical structures as the posterior interosseous nerve, the enthesis of the distal biceps tendon, and the proximal radioulnar joint. This clinical case describes for the first time osteochondroma of the radial neck, which causes supination deficiency. Case description: for the first time, successful experience in treating a patient with osteochondral exostosis of the radial neck is presented - the tumor was removed from a lateral approach in the position of pronation of the forearm. Conclusion: surgical treatment allowed us to achieve excellent treatment results with complete restoration of function and range of motion in the elbow joint. Key words: osteochondral exostosis, elbow joint, osteochondroma, radial neck, contracture, benign neoplasm, posterior interosseous nerve