Multilobular tumor of bone arising from the palatomaxillary suture line in the skull of a dog.

A 6-year-old neutered male bloodhound dog was presented for surgical evaluation of an intraoral hard palate mass noted during a routine dental cleaning performed by the primary veterinarian. Computed tomography (CT) of the skull revealed a well-defined, multilobular, mineralized mass with a coarse, granular appearance, centered along the palatomaxillary suture extending into both the nasal and oral cavities. Bilateral caudal maxillectomy was performed for curative-intent resection of the tumor. The histopathology of the mass was consistent with a completely excised palatomaxillary multilobular tumor of bone (MLTB). This is apparently the 1st successful report of surgical excision of an MLTB associated with the palatomaxillary suture line. Key clinical message: Our findings emphasized that MLTB should be considered as a differential diagnosis for masses arising in the location of cranial sutures, and a definitive diagnosis can be made postoperatively with histopathology of the mass.