en جراحی دست / آرنج Hand surgery / Elbow گزارش مورد Case Report <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Tahoma;"><span style="line-height:2;">Tenosynovial chondromatosis is an extremely rare, extra-articular variant of synovial chondromatosis. It is often mistakenly considered a cartilage or soft tissue tumor. This condition primarily affects the tendon sheath, commonly in the hands or feet. It typically presents as a gradually enlarging soft tissue mass that may be painful or restrict joint movement. In its early stages, plain radiographs may not show any abnormalities. This report discusses a case featuring a multinodular proliferation of cartilage, bone erosion, and a periosteal reaction located deep in the flexor tendons of the index finger.</span></span></span></div> Tenosynovial chondromatosis, Soft tissue neoplasm, Proximal interphalangeal (PIP) joint, Osteochondromatosis, Finger, Hand, Bone 49 52 http://jros.iums.ac.ir/browse.php?a_code=A-10-1306-1&slc_lang=en&sid=1 Farid Najd Mazher faridnajdmazhar@gmail.com 10031947532846007101 10031947532846007101 No Department of Orthopedic Surgery, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. Ahmad I Hasan dahmadhasan1@gmail.com 10031947532846007102 0009-0002-5763-8868 No Department of Orthopedic Surgery, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. Alireza Ganbari alireza.ghanbari92@yahoo.com 10031947532846007103 10031947532846007103 Yes Department of Orthopedic Surgery, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. Reza Torab rztrb67@gmail.com 10031947532846007104 0009-0005-7274-2809 No Department of Orthopedics, School of Medicine, Bone and Joint Reconstruction Center, Iran University of Medical Sciences, Tehran, Iran.