Differential diagnosis of CT in parotid pleomorphic adenoma and adenolymphoma

Objective To investigate the value of CT in the differential diagnosis of parotid pleomorphic adenoma and adenolymphoma.Methods The CT findings of 12 cases parotid pleomorphic adenoma and 8 cases adenolymphoma proved by pathology were reviewed retrospectively,including their number,location,border,CT enhancement characteristics,and so on.Results Twelve cases of parotid pleomorphic adenoma were single,10 cases on the parotid gland in superficial lobe,8 cases on the posterior inferior quadrant.Eight cases (13 lesions) of adenolymphoma,were all on the parotid gland in superficial lobe and posterior inferior quadrant,with clear boundary.Enhanced arterial phase of parotid pleomorphic adenoma was (11 ± 4) Hu,and of adenolymphoma was (31 ± 11) Hu,the difference was statistically significant (P ＜0.05).Enhanced venous phase of parotid pleomorphic adenoma was(14 ± 6) Hu,and of adenolymphoma was (28 ± 10) Hu,the difference was statistically significant (P ＜0.05).Conclusions CT scan can reflect the essential difference dynamicly and comprehensively from the combination of hemodynamic and morphological aspects between parotid pleomorphic adenoma and adenolymphoma,it has an important value. Key words: Parotid; Pleomorphic adenoma; Adenolymphoma; Tomography; X-ray computed