## Why option 1 is correct The chalky-white deposits marked **A** are calcium soaps — the histopathologic hallmark of acute pancreatitis. When pancreatic lipase is released into peripancreatic adipose tissue during acute pancreatitis, it hydrolyzes triglycerides into free fatty acids. These free fatty acids then bind calcium ions to form insoluble calcium soaps (saponification). This mechanism is pathognomonic for acute pancreatitis and is the basis for the characteristic gross and microscopic appearance. In severe pancreatitis with extensive fat necrosis, systemic hypocalcemia can develop as calcium is consumed in this saponification process — a poor prognostic sign (Ranson criteria, BISAP). [Robbins 10e Ch 19; Harrison 21e Ch 348] ## Why each distractor is wrong - **Option 2**: Amylase digests carbohydrates (starch, glycogen), not lipids. Amylase does not cause calcium precipitation in fat. While amylase is elevated in pancreatitis, it is not the enzyme responsible for fat necrosis. - **Option 3**: Pancreatic proteases do cause tissue damage in pancreatitis, but they do not directly cause calcium deposition in adipose tissue. Proteases are responsible for hemorrhage and edema, not the specific mechanism of fat saponification. - **Option 4**: While pancreatic duct obstruction may contribute to pancreatitis pathogenesis (e.g., in gallstone pancreatitis), it does not explain the specific mechanism of calcium soap formation. Back-diffusion does not account for the lipase-mediated triglyceride hydrolysis required for saponification. **High-Yield:** Fat necrosis + chalky calcium deposits = pancreatic lipase + free fatty acids + calcium = calcium soaps. Severe pancreatitis → hypocalcemia → poor prognosis. [cite: Robbins 10e Ch 19; Harrison 21e Ch 348]
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