Parotid masses in patients with previous ear surgery.

This paper describes three cases of patients presenting with lumps in their parotid gland, the origin of which was difficult to define. In each case the past medical history revealed that the patients had undergone previous ipsilateral middle ear surgery. We highlight the fact that where there has been previous incisions in the skin about the ear, there is a risk of epidermal inclusion cysts in the parotid gland. These cysts can occur many years after the initial surgery and therefore may not be identified as an obvious origin to lumps in the parotid gland. Rarely as this series highlights there may also be extension of a cholesteatoma (a collection of keratin which arises from the eardrum and extends into the middle ear space) from the mastoid bone to the parotid gland. We recommend formal ear examination where there is a history of previous ear surgery and an ipsilateral parotid gland lump is present.