Molar cementoma of the upper jaw in a warmblood gelding -A case reportThis case report describes clinical findings, diagnostics and therapy of a cementoma in the left upper jaw of a horse. A 14-year-old Hanoverian warmblood gelding was presented with a swelling in the left upper jaw. Diagnostic methods included physical exam, adspection and endoscopic examination of the oral cavity and X-rays of the head. Therapeutically, oral extraction of the teeth 208 and 209 (Triadan tooth nomenclature system) and the hard mass contacting the 209th under common anesthesia followed. Tissue samples were decalcified and routinely processed. Clinically and radiologically radiopaque, hard tissue was present at the buccal surface of the 209th. The peroral endoscopic examination showed carious alterations of 208th and 209th and local inflammation of the adjacent buccal mucosa. Both teeth and the hard tissue were perorally extracted without complications. Histologically, the mass consisted of irregularly arranged cement. The clinical, radiological and histological findings are compatible with a cementoma. Usually cementomas in horses are located at the incisive and/or premolar teeth. This case report documents a molar cementoma and the possibility to extract tumorous degraded molar teeth perorally for the first time. Cementomas are very rare benign tumours in horses and should be considered as differential diagnosis in cases with swellings of the upper and lower jaw.