On MRI of the parotid gland, a mass arising within the deep lobe of the parotid with dumbbell extension into the parapharyngeal space would displace the parapharyngeal fat in which direction?

• A Posterolaterally ✓
• B Medially
• C Anteriorly and medially
• D Superiorly toward the skull base

Explanation

The parapharyngeal fat pad (prestyloid compartment) lies medial to the parotid gland. A deep lobe parotid tumour extending into the parapharyngeal space displaces the fat pad medially and posteriorly — appearing to 'push' the fat away from the parotid. In contrast, a primary parapharyngeal space tumour arising from the prestyloid space would displace the fat anteriorly and laterally. This fat displacement pattern on MRI helps distinguish the site of origin of parapharyngeal masses.

Reference: Grainger & Allison's Diagnostic Radiology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.