Intrapancreatic accessory spleen: Evaluation with CT and MRI

Ding,Qianjiang; Ren,Zhihao; Wang,Jianhua; Ma,Xiaolong; Zhang,Jian; Sun,Gaofeng; Zuo,Changjing; Gu,Hao; Jiang,Hui

doi:10.3892/etm.2018.6613

Intrapancreatic accessory spleen: Evaluation with CT and MRI

Authors:
- Qianjiang Ding
- Zhihao Ren
- Jianhua Wang
- Xiaolong Ma
- Jian Zhang
- Gaofeng Sun
- Changjing Zuo
- Hao Gu
- Hui Jiang
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Affiliations: Department of Radiology, The Affiliated Hospital of Medical School, Ningbo University, Ningbo, Zhejiang 315020, P.R. China, Department of Radiology, Changhai Hospital, Second Military Medical University, Shanghai 200433, P.R. China, Department of Nuclear Medicine, Changhai Hospital, Second Military Medical University, Shanghai 200433, P.R. China, Department of Pathology, Ningbo Second Hospital, Ningbo, Zhejiang 315010, P.R. China, Department of Pathology, Changhai Hospital, Second Military Medical University, Shanghai 200433, P.R. China
Published online on: August 17, 2018 https://doi.org/10.3892/etm.2018.6613
Pages: 3623-3631

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Abstract

The aim of the present study was to evaluate the characteristics of computed tomography (CT) and magnetic resonance imaging (MRI), particularly diffusion‑weighted imaging (DWI), in the imaging of intrapancreatic accessory spleen (IPAS). The clinical and pathological records of 9 patients, including 8 patients with IPAS and 1 patient with splenosis, were reviewed. The patients had undergone plain and triple‑phase enhanced CT scanning (n=9) and MRI scanning (n=8). The lesions of the 8 IPAS patients were located in the pancreatic tail, and were round (n=3), oval (n=4) or triangular (n=1) in shape. The CT and/or MRI densities, signal intensities and dynamic enhanced patterns of the lesions were similar to those of the orthotopic spleen. In DWI images (n=5), the IPAS regions presented high signal intensity (SI), and no significant difference in the apparent diffusion coefficient determined using a b‑value of 600 sec/mm2 was identified between the IPAS and orthotopic spleen (P>0.05). One patient with splenosis complicated with cirrhosis had a nodule located in the pancreatic tail with an unenhanced CT value of 65 HU. In MRI examination, with the exception of the dynamic enhancement pattern, the T1‑weighted, T2‑weighted and DWI signals of splenosis were inconsistent with those of the normal spleen. In conclusion, in pre‑contrast and post‑contrast‑enhanced CT and MRI images, IPAS exhibits similar characteristics to the orthotopic spleen. CT and MRI used in combination with DWI are important in the diagnosis of IPAS.

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