What veins constitute the portal venous system?
Portal vein, splenic vein, and superior and inferior mesenteric veins.
What are some complications of polycythaemia vera?
Splenic infarction; venous thrombosis; acute superior mesenteric venous thrombosis; dural venous sinus thrombosis; Budd-Chiari syndrome; cerebrovascular events; myocardial infarction.
Massive splenomegaly (23 cm in maximal coronal diameter).
Porto-systemic collaterals identified mostly around the spleen.
Splenic vein is not identified likely due to a chronic thrombo-occlusive disorder.