This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Vascular complications of acute pancreatitis include the following except - 
Select and explain. 
A. Splenic vein thrombosis, B. Splenic artery aneurysm, C. Gastroduodenal artery aneurysm, D. Middle colic artery thrombosis
D: Middle colic artery thrombosis
Answer: D: Middle colic artery thrombosis 
Explanation: Acute pancreatitis is rarely associated with arterial vascular complications.
MC vessel affected: Splenic artery.
Other vessels: Superior mesenteric, cystic, and gastroduodenal arteries.

Vascular Thrombosis

Pancreatic inflammation can produce vascular thrombosis.
MC affected vessel: Splenic vein.
In severe cases, it can extend into the portal venous system.
Imaging demonstrates splenomegaly, gastric varices, and splenic vein occlusion.
Thrombolytics have been described in the acute early phase.
Most patients can be managed with conservative treatment.
Recurrent episodes of upper gastrointestinal bleeding caused by venous hypertension should be treated with splenectomy.

Pathogenesis
It has been proposed that pancreatic elastase damages the vessels, leading to pseudoaneurysm formation.
Clinical Features

Spontaneous rupture results in massive bleeding.
Clinical manifestations include sudden onset of abdominal pain, tachycardia, and hypotension.

Treatment

If possible, arterial embolization should be attempted to control the bleeding.
Refractory cases require ligation of the affected vessel.
The mortality ranges from 28-56%.
MC affected vessel in acute pancreatitis: Splenic artery (pseudoaneusysm formation).
MC affected vessel leading to vascular thrombosis caused by acute pancreatitis: Splenic vein.