Imaging findings of deep-lobe parotid tumors involving the parapharyngeal space / 实用放射学杂志

ABSTRACT

Objective To analyze the imaging appearances of the deep-lobe parotid tumors involving the parapharyngeal space (PPS).Methods The CT and MRI data of 23 cases with deep-lobe parotid tumors involving PPS were analyzed retrospectively.The neoplasms included pleomorphic adenomas (n=1 9),basal cell adenomas (n =2),neurilemmomas(n = 1 )and malignant myoepi-thelioma(n=1).Results The lesions presented as oval(n=1 7)or irregular (n =6)masses.None of the 23 cases showed visible fat space between the tumors and deep-lobe of parotid glands.Fat Cap Sign was found in 9 cases.Parotid Pedicle Sign was demonstrated in 8 cases.The styloids were displaced posteriorly(n=4)or surrounded(n=4)by the tumors.Five masses were found to be situated at the superficial side to the posterior belly of the digastric muscle.Carotid sheaths were shifted anteromedially (n=7)or postero-medially(n= 1 1 )by the tumors.Conclusion The deep-lobe parotid tumors involving PPS have some imaging features which are helpful in the differential diagnosis between the deep-lobe parotid tumors and PPS primary tumors.