Zygomatic sialocoele with underlying ductal neoplasia in a cat

A 9-year-old British Short Hair cat presented with a 12-month history of progressive exophthalmos to the right eye. A computed tomography (CT) scan was performed, and it revealed a large 3.1 × 2 × 2.3 cm peripherally contrast-enhancing right retrobulbar mass in the region of the zygomatic salivary gland. Preliminary results of a fine-needle aspirate (FNA) were inconclusive, so the mass was surgically excised via the right partial zygomatic ostectomy approach. Histopathological evaluation was consistent with benign ductal neoplasia of salivary gland origin.