Causes of Fat Malabsorption - Differential Diagnosis
Biliary Duct Obstruction
• Autoimmune— PBC, PSC
• Infection— liver fluke, HIV, CMV, ascariasis
• Malignancy— cholangiocarcinoma
• Other— choledocho/ithiasis
Intestinal Wall Infiltration
• Malignancy— lymphoma
• Autoimmune— Crohn's disease, celiac disease
• Immunodeficiency— CVID
• Protein- amyloidosis
Other:
• Cholestatic drugs- e.g. azathioprine, phenytoin
Pancreatic Exocrine Insufficiency - Acquired
• Chronic pancreatitis
• Pancreatic resection
Pancreatic Exocrine Insufficiency - Hereditary
• Hemochromatosis
• Shwachman-Diamond syndrome
• Cystic fibrosis
• Pancreatic lipase deficiency
Pancreatic Exocrine Insufficiency - Malignancy
• Pancreatic adenocarcinoma
• Gastrinoma
Autoimmune
• Celiac disease
• IBD- CD, UC
Altered length
• Short bowel syndrome
• Small bowel resection
Infectious
• SIBO
• Giardiasis
• Whipple' disease
• Tropical sprue
• HIV enteropathy
Nikita Deshpande @NikitaSonaliyaD
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