“PLEOMORPHIC ADENOMA (PAROTID)”

The rule of 80%: pleomorphic adenoma accounts for 80% of benign parotid tumours, 
80% of pleomorphic adenomas occur in the parotid and 
80% occur in the superficial lobe. Up to 20% undergo malignant degeneration.
US

•  Hypoechoic multiloculated mass

Sialogram

•  Clawed fist appearance

CT

•  Well-defined, homogeneous mass that is slightly higher attenuation than muscle

MRI

•  Usually bright on T2 (differentiates it from parotid malignancy, which is hypo-intense)
•  Iso-intense to muscle on T1 sequences
•  Avid enhancement with contrast



 

Leave a Comment

Your email address will not be published.

Scroll to Top