PMC2810581_01
Transverse sonogram of the left flank demonstrating a large mass with multiloculated, thick septum and having hyperechogenic calcific foci (arrow).
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F1
There were echogenic areas within the lesion consistent with calcifications (Fig. 1).
Transaxial abdominal CT scan demonstrating low attenuation cysts of the retroperitoneum displacing the pancreas (arrow) anteriorly and mildly compressing the adrenal and left kidney. Calcification is seen as high attenuation foci in the cyst.
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F2
The mass extended to the abdominal wall on the left anterior region (Fig. 2).
A. Axial T2 weighted MR (TR 3000 ms, TE 112 ms) and B. Coronal T2 weighted MR showing a high signal intensity mass lesion in the retroperitoneum.
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F3
The lesion was hypointense on T1 weighted and hyperintense on T2 weighted sequences and extended down to the neighborhood of the gall bladder (Fig. 3).
Pathologic specimen showing multiple cystic spaces containing lymphoid and endothelial cells (hematoxylineosin x100).
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F4
Postoperative pathological examination confirmed the radiological diagnosis (Fig. 4).