Pancreatic Disorders: A Comprehensive Review OmpathStudy

Pancreatic Disorders: A Comprehensive Review Summary The pancreas is a vital organ performing both exocrine and endocrine functions. Exocrine failure , primarily due to conditions like chronic pancreatitis , leads to malabsorption and steatorrhea . In contrast, endocrine failure results in diabetes mellitus . Acute pancreatitis , often caused by gallstones or alcohol , involves the premature activation of trypsin within the pancreas, leading to autodigestion . It typically presents with severe epigastric pain and elevated amylase/lipase levels. Pseudocysts are a common complication of acute pancreatitis. Chronic pancreatitis is characterized by progressive fibrosis and destruction of pancreatic parenchyma, most commonly from chronic alcohol abuse . This leads to recurrent pain, steatorrhea, and eventually diabetes. Pancreatic neoplasms range from benign serous cystadenomas to highly aggressive pancreatic ductal adenocarcinoma (PDAC) . PDAC typically affects the head of the pancreas , causing painless jaundice , and carries a grim prognosis due to late diagnosis and rapid metastasis. Diabetes mellitus involves either autoimmune destruction of beta cells (Type 1) or a combination of insulin resistance and relative insulin deficiency (Type 2). Both types lead to microvascular and macrovascular complications. Various pancreatic cysts , including pseudocysts and true cysts (serous, mucinous), also present distinct clinical and pathological features, with mucinous types carrying significant malignant potential. Key Points Exocrine Pancreas : Acinar cells produce digestive enzymes ( amylase, lipase, trypsin ); failure leads to malabsorption and steatorrhea . Endocrine Pancreas : Islets of Langerhans contain beta cells (insulin), alpha cells (glucagon), and delta cells (somatostatin); failure leads to diabetes . Acute Pancreatitis Pathogenesis : Premature activation of trypsin within the pancreas, leading to autodigestion . Causes of Acute Pancreatitis (GET SMASHED) : Gallstones (most common overall), Alcohol (most common in recurrent cases), Hypercalcemia , Hypertriglyceridemia , Trauma , Drugs , ERCP . Acute Pancreatitis Key Histo Finding : Necrotic acini with preservation of ducts . Chronic Pancreatitis Pathogenesis : Repeated bouts of inflammation leading to fibrosis and destruction; chronic alcohol is the most common cause. Chronic Pancreatitis Key Sequence : Steatorrhea (exocrine failure) comes BEFORE diabetes (endocrine failure). Pancreatic Ductal Adenocarcinoma (PDAC) Location : 60-70% occur in the HEAD of the pancreas. PDAC Survival : 5-year survival is typically <10% , one of the worst prognoses. PDAC Key Genetic Mutation : KRAS activating mutation ( 90% of cases). Courvoisier Sign : Painless jaundice + palpable non-tender gallbladder , classic for pancreatic head cancer. Trousseau Syndrome : Migratory thrombophlebitis , associated with tumor hypercoagulability in PDAC. Type 1 Diabetes Mellitus (T1DM) : Autoimmune destruction of β cells leading to absolute insulin deficiency, associated with HLA-DR3/DR4 and insulitis . Type 2 Diabetes Mellitus (T2DM) : Insulin resistance + relative insulin deficiency, strongly linked to obesity and characterized by islet amyloid deposits (IAPP) . Pancreatic Pseudocyst : Most common complication of acute pancreatitis; NO epithelial lining . Mucinous Cystadenoma : Has HIGH malignant potential , requires resection. Detailed Notes Pancreas Basics The exocrine pancreas , composed of acinar cells , produces digestive enzymes such as amylase, lipase, and trypsin . Failure of these functions leads to malabsorption and steatorrhea . The endocrine pancreas consists of the islets of Langerhans , which contain beta cells (producing insulin), alpha cells (producing glucagon), and delta cells (producing somatostatin). Failure of the endocrine functions results in diabetes . 1. Acute Pancreatitis Classification Acute pancreatitis can be classified as interstitial (mild) , involving only edema with a good prognosis, or necrotizing (severe) , characterized by hemorrhage and necrosis, which carries a high mortality rate. Pathogenesis The core mechanism of acute pancreatitis is the premature activation of trypsin inside the pancreas. This activated trypsin then triggers other enzymes like elastase, phospholipase, and lipase, leading to the autodigestion of pancreatic tissue. Trypsin is considered the master activator; its premature activation initiates the entire cascade. Causes — GET SMASHED Cause Key Point --- --- Gallstones Most common overall Alcohol Most common in recurrent cases Hypercalcemia Ca²⁺ activates trypsinogen Hypertriglyceridemia 1000 mg/dL threshold Trauma Blunt abdominal injury Drugs Azathioprine, thiazides, steroids ERCP Post-procedural complication Gross Morphology On gross examination, the pancreas in acute pancreatitis appears swollen and edematous . Chalky white deposits , indicative of fat necrosis and calcium saponification (where calcium ions bind to free fatty aci