Huseyin Ozdemir, et al. A B Fig. 1. Transverse sonogram of the left flank demon- strating a large mass with multiloculated, thick septum and having hyperechogenic calcific foci (arrow). Fig. 2. 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. could not be identified by CT. The body and tail of the pancreas were displaced to the anterior due to compression from the mass. The mass extended to the abdominal wall on the left anterior region (Fig. 2). In order to obtain multiplanar views and iden- tify the accompanying lesions, magnetic resonance imaging (MRI) was performed. 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). Laparotomic findings revealed a cystic lesion which contained viscous yellow fluid and lay between the tail of the pancreas and the left lobe of the liver. Together with the previous history and US, CT Yonsei Med J Vol. 46, No. 5, 2005 Fig. 3. 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. and MR findings this case was evaluated as recur- rent cystic lymphangioma. Postoperative patholo- gical examination confirmed the radiological diag- nosis (Fig. 4). DISCUSSION Lymphangiomas are lesions of lymphatic ves- sels that present as hemangiomas and it is difficult to evaluate whether they are real tumors like hamartomas or only lymphangiectasis.6 However, it is currently accepted that lymphatic vessel tumors are developmental malformations rather than being real tumors.7 Abnormal lymphatic channels dilate in an attempt to produce uni- or