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This elderly male patient, a known case of non Hodgkin's lymphoma has a large retroperitoneal mass on ultrasound imaging of the abdomen. Non Hodgkin's lymphoma is known to cause a lymph node conglomerate mass as in this case, to surround the aorta and inferior vena cava encasing these two major vessels. The arteries emerging from the aorta, namely the renal arteries and the celiac artery are also encased by the lymph node mass- the "sandwich sign". This condition is called retroperitoneal lymphoma.
References: Ultrasound imaging of retroperitoneal lymphoma