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Abdominal MRI. T2 phase coronal section (A) illustrating a cystic structure measuring 6.9 × 6.6 cm in the left retroperitoneum with an area of nodularity medially. Axial sections in the T1 phase before (B) and after (C) gadolinium contrast through the medial nodular structure showing subtle nodular and cystic wall enhancement. Axial section in the T1 phase after contrast illustrating that two cystic structures are associated with the left kidney (D).
