Fig. 1From: Retroperitoneal hamartoma mimicking angiomyolipoma: a case report and review of literatureA–D A large soft tissue dense mass (white arrow) was seen below the right kidney of the retroperitoneum on CT images, with an ill-defined boundary with the psoas major muscle. No definite enhancement was observed after iodine contrast injection. E MRI T1WI showed hyperintense signal mass with ill-defined boundary with psoas major muscle and flowing void effect was revealed in the tumor. F After gadolinium injection, cluster and speckled enhanced focal shadows were observed in the mass on coronal MRIBack to article page