Foreign bodies in the oral and maxillofacial region are often experienced after trauma and dental treatment. We describe a case of acute sialadenitis in the submandibular gland caused by penetration of a fish bone in a 66-year-old woman. She had swelling and spontaneous pain in the right submandibular region after eating a fish. Radiographic examination showed a needle-like radiopaque body in the right submandibular gland. We diagnosed acutesialadenitis in the right submandibular gland caused by a penetrating foreign body and surgically extracted the right submandibular gland. The foreign body measured 15 × 1.5 mm and was a needle-like object. On pathological examination, the foreign body was found to be a fish bone.
