An accessory parotid gland is defined as salivary tissue that is separate from the main parotid gland, overlying the masseter muscle and in front of the Stensen's duct 1. Accessory parotid glands are a common variation and can be observed incidentally. The incidence according to one study was 21% 2.
Accessory parotid glands on CT or MRI show similar density or signal intensity as the main parotid gland as seen in our case.