Capitate Bone Osteoblastoma: A Case Report and Literature Review

margins confined to the capitate (Fig. 2).Magnetic resonance imaging (MRI) showed a 17 10 8 mm cystic lesion with sclerotic borders, posterior cortical breach, and a small extraosseous fluid collection (15 10 6 mm) (Figs 3 and4).There was mild heterogeneous contrast enhancement.Using a dorsal wrist approach, the extensor tendons were retracted and the midcarpal joints were identified.The lesion in the proximal capitate was confirmed intraoperatively with a Kirschner IntroductIonOsteoblastoma is a rare, benign bone-forming neoplasm, accounting for approximately 1% of all primary bone tumors.While it most commonly affects the vertebral column, pelvis, and long bones, its occurrence in the small bones of the hand and wrist is infrequent.Within the carpus, the scaphoid is more commonly involved, and osteoblastoma of the capitate is exceptionally rare, with only a few cases documented in the literature. [1]][3] Osteoblastoma shares histological similarities with osteoid osteoma, although they differ in size potential and clinical behavior.The rarity of carpal osteoblastoma means it is often overlooked in the differential diagnosis of wrist pain.We present a rare case of capitate osteoblastoma treated with extended curettage, cryotherapy, and bone grafting, along with a review of current literature.Written informed consent was obtained from the patient for the publication of this case report and any accompanying images case PresentatIon A 23-year-old right-handed woman presented with a 9-month history of progressive right wrist pain, dorsal swelling, and restricted range of motion (ROM) unresponsive to nonsteroidal antiinflammatory drugs (NSAIDs).On examination, point tenderness was noted over the capitate, with restricted flexion and extension.Laboratory parameters were normal.Plain radiographs revealed an osteolytic lesion within the proximal capitate (Fig. 1).Computed tomography (CT) scan showed a well-defined, hypodense cystic lesion with sclerotic (hyperdense)