Figure 1 : Ultrasound probe placed transversely in the hypogastric region showed iso to hypoechoic lesion in the retroperitoneum encasing the aorta and IVC causing its upliftment from the vertebral body. Multiple enlarged lymph nodes were also seen.
Fig 2 On CECT, there is an ill-defined hypodense non enhancing cystic lesion in the retroperitoneum predominantly involving the vascular plane, encasing the aorta and IVC. It is causing upliftment of aorta from the vertebral body.
The lesion is extending superiorly till the aortic hiatus into middle mediastinum and inferiorly till the iliac vessels- resulting in characteristic trans-compartmental extension.
Fig 3 On MRI, it is hyperintense on T2 and hypointense on T1 sequences. On DWI, it shows no diffusion restriction. It shows no significant contrast enhancement on post contrast images.