Man 20 yo with abdomen distention at right subcostal region, no pain no fever.
Ultrasound of abdomen detected one big mass in retroperitoneum, multiseptation and multiloculated in connection with troubled fluid inside.
US 1= longitudinal scan over right kidney.
US 2 = crossed sectionnal scan over aorta.
US 3 = longitudinal scan over spine.
US 4 = longitudinal scan at pelvis.
MSCT of abdomen with CE:
CT 1 = sagital scan of cystic mass retroperitoneum.
CT 2 = frontal scan of this mass is cystic homogeneous.
CT 3 = frontal view of this mass and gastrointestinal mass arround.
CT 4 = aorta no deplacement.
Normal blood test and all biocancer markers.
What is your suggestion for diagnosis?