Signet ring cell tumor of the minor salivary gland exhibiting benign behavior.

Signet ring cell (SRC) carcinomas are usually aggressive malignancies, arising most frequently in the stomach and gastrointestinal tract, but also, although less often, in other organs such as the breast, bladder, and lungs. They are particularly unusual in the salivary glands, and the aim of the present study is to report a case of a tumor of the minor salivary glands of the lower lip composed largely of SRCs but which displayed benign clinical behavior.