title: Diagnostic value of CT perfusion imaging for parotid neoplasms.
abstract: OBJECTIVE
  To assess the value of CT perfusion imaging in the differentiation of different histological categorization of benign tumours from malignant tumours in patients with parotid neoplasms.
  
  
  METHODS
  CT perfusion was successfully performed in 62 patients with parotid neoplasms whose diagnoses were confirmed by surgery or biopsy. The software generated a tissue time-density curve (TDC) and measured blood volume, blood flow, mean transit time and capillary permeability surface product. One-way ANOVA and receiver operating characteristic curves were used to analyse the difference and diagnostic efficacies of all perfusion data between each one of the benign tumours and malignancies. Statistical significance was assigned at the 5% level.
  
  
  RESULTS
  Pleomorphic adenomas mainly had a gradually ascending TDC. Warthin tumours showed a fast ascent followed by a fast descent. The TDC of basal cell adenomas had a fast ascension followed by a plateau, then a gradual descent. Malignant tumours mainly showed a rapidly ascending curve with a stable plateau. Significant differences were observed in blood flow, blood volume and mean transit time between pleomorphic adenomas and malignant tumours (p < 0.05) as well as in blood flow and blood volume between the Warthin tumours, the basal cell adenomas and the malignant tumours (p < 0.05). Differences in permeability surface between the basal cell adenomas and malignant tumours were significant (p < 0.01).
  
  
  CONCLUSIONS
  CT perfusion of parotid gland could provide TDC and perfusion data, which were useful in the differentiation of different histological benign tumours and malignant tumours in the parotid gland.
authors.affiliation: Department of Radiology, the First Affiliated Hospital of Dalian Medical University, Dalian, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Dong
authors.forename: G-W
authors.initials: GW
authors.lastname: Lei
authors.forename: S-W
authors.initials: SW
authors.lastname: Wang
authors.forename: S-W
authors.initials: SW
authors.lastname: Zheng
authors.forename: Y
authors.initials: Y
authors.lastname: Ge
authors.forename: F-c
authors.initials: FC
authors.lastname: Wei
mesh_terms: D000235:Adenolymphoma / Q000000981:diagnostic imaging; D000236:Adenoma / Q000000981:diagnostic imaging; D008949:Adenoma, Pleomorphic / Q000000981:diagnostic imaging; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001810:Blood Volume / Q000502:physiology; D002199:Capillary Permeability / Q000502:physiology; D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007472:Iohexol / Q000031:analogs & derivatives; D008297:Male; D008875:Middle Aged; D010307:Parotid Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging*; D055420:Perfusion Imaging; D012039:Regional Blood Flow / Q000502:physiology; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult
chemical_list: D003287:Contrast Media; D007472:Iohexol; C038192:iopromide
keywords: computed tomography; neoplasms; parotid gland; perfusion