J Korean Soc Radiol.  2021 Mar;82(2):393-405. 10.3348/jksr.2020.0059.

Differentiation of Adenomyoma from Localized Adenocarcinoma of the Ampulla of Vater Using Multidetector CT

Affiliations
  • 1Department of Radiology, Chungbuk National University Hospital, Cheongju, Korea.
  • 2Department of Radiology, College of Medicine, Chungbuk National University, Cheongju, Korea.
  • 3Department of Pathology, Chungbuk National University Hospital, Cheongju, Korea.

Abstract

Purpose
To determine the multidetector CT (MDCT) findings that differentiate adenomyoma of the ampulla of Vater (AOV) from localized adenocarcinoma of the AOV.
Materials and Methods
Sixteen and 30 patients with adenomyoma and localized adenocarcinoma of the AOV, respectively, were evaluated using MDCT. We analyzed the size and attenuation value and presence of uniform enhancement of the lesions, diameters of the extrahepatic bile duct (EHD) and main pancreatic duct, presence of regional lymph node enlargement, and laboratory findings. We determined the independent findings for differentiating adenomyoma from localized adenocarcinoma of the AOV using multivariate analysis.
Results
The size of the lesion and diameter of the EHD were significantly smaller for adenomyoma than those for localized adenocarcinoma of the AOV (all p < 0.001). In multivariate analyses, a lesion size of ≤ 1.3 cm, an EHD diameter of ≤ 1.3 cm, and an alanine transaminase level of ≤ 31 IU/L significantly differentiated adenomyoma from localized adenocarcinoma of the AOV. When all of these three findings were met, the specificity for adenomyoma of the AOV was 93.3%.
Conclusion
MDCT imaging may facilitate the differential diagnosis of adenomyoma and localized adenocarcinoma of the AOV based on the size of the lesion and diameter of the EHD.

Keyword

Adenomyoma; Ampulla of Vater; Multidetector Computed Tomography
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