E-ISSN 1305-3612
Head and Neck Imaging - Original Article
Basal cell adenoma and myoepithelioma of the parotid gland: patterns of enhancement at two-phase CT in comparison with Warthin tumor
1 Department of Radiology, Hanyang University Hospital, Hanyang University School of Medicine, Seoul, Korea  
2 Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea  
3 Department of Radiology, Research Institute of Radiological Science, Yonsei University School of Medicine, Seoul, Korea  
Diagn Interv Radiol ; : -

Abstract

 

PURPOSE: The early enhancement and a washout pattern are reported to be the characteristic imaging features of Warthin tumor (WT). Compared to WT, the purpose of this study was to evaluate the enhancement patterns of basal cell adenoma (BCA) and myoepithelioma (ME) of the parotid gland on two-phase CT.

 

METHODS: We retrospectively evaluated two-phase CT examinations of histologically proven 19 BCAs, 12 MEs, and 23 WTs of the parotid gland. In all patients, CT scans were obtained at early and delayed phases with scanning delays of 40 and 180 seconds, respectively. We measured the attenuation values on each phase of CT scans and calculated washout attenuation (AWO) and relative percentage enhancement washout ratio (RPEWR). From the data acquired, we statistically compared the enhancing characteristics among three tumor groups.

 

RESULTS: Based on the results of AWO and RPEWR, 15 (79%) of 19 BCAs, 9 (75%) of 12 MEs, and 23 (100%) of 23 WTs demonstrated a washout pattern of enhancement on two-phase CT scans. Despite variations of the individual tumors, both parameters revealed no significant difference among three tumor groups.

 

CONCLUSION: BCAs and MEs of the parotid gland frequently show early enhancement and a washout pattern on two-phase CT, which can be indistinguishable from WTs in the majority of cases.

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