Pancreatic Pseudocyst: This condition is a common complication of pancreatitis where a fluid collection forms in the pancreas, which can exert pressure on the liver, causing hepatomegaly. The proximity of the pancreas to the liver and the potential for direct compression or inflammation spread makes this a highly plausible cause.

Gallstones: Gallstones are a common cause of pancreatitis, and if they obstruct the common bile duct, it can lead to bile duct dilation and subsequent liver enlargement.
Biliary Obstruction: Similar to gallstones, any cause of biliary obstruction (e.g., tumors, strictures) can lead to hepatomegaly due to the accumulation of bile in the liver.
Inflammatory Response: Severe pancreatitis can lead to a systemic inflammatory response syndrome (SIRS), which may cause liver enlargement due to inflammation and congestion.

Hepatic Artery Aneurysm or Pseudoaneurysm: Although rare, these conditions can be life-threatening and are associated with pancreatitis, especially if there's erosion into the hepatic artery. Early detection is crucial for survival.
Portal Vein Thrombosis: This condition can occur in the setting of pancreatitis, especially if there's associated splenic vein thrombosis. It's critical to diagnose as it can lead to severe complications like intestinal ischemia.
Infected Pancreatic Necrosis: While not directly causing hepatomegaly, infected pancreatic necrosis is a serious complication of pancreatitis that requires prompt diagnosis and treatment to prevent sepsis and death.

Pancreatic Cancer: Although pancreatitis is more commonly associated with benign conditions, pancreatic cancer can cause both pancreatitis and hepatomegaly, especially if there's liver metastasis or bile duct obstruction.
Lymphoma: Rarely, lymphoma can cause pancreatitis and hepatomegaly, either through direct involvement of the pancreas and liver or through systemic disease.
Sarcoidosis: This autoimmune condition can cause both pancreatitis and hepatomegaly, though it's a rare cause of these symptoms.