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Parotid lipoma

Case contributed by Mostafa Elfeky
Diagnosis almost certain

Presentation

Long standing left parotid swelling.

Patient Data

Age: 70 years
Gender: Male
ct

Left parotid space swelling shows a well-defined fat density lesion posterior to the left parotid gland, inseparable from it. It is measuring 5.2 x 3.5 x 6 cm in AP, SS and CC dimensions. 

It has pure fatty content (mean -100 HU) with fine traversing vessels.

It is superficial to sternomastoid muscle, superficial temporal artery, deep lobe of the left parotid gland and the mastoid process of left petrous bone.

It is deep to part of the superficial lobe of the left parotid gland and platysma muscle.

It is inferior to the left ear lobule and outer external auditory canal.

It has wide contact with the posterior surface of the superficial lobe of the parotid gland, pushing it anteriorly forming intra-parotid concavity/extension. The outer surface of the left sternomastoid muscle.

Case Discussion

Features are in keeping with left parotid lipoma. It is a rare benign non-epithelial salivary gland neoplasm with characteristic fat density on CT.

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