Dr. Michael Chew @mchew85
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GrepMed Gastroenterology-Hepatology Editor, Academic Hospitalist UC Davis Medical Center Internal Medicine, Yale Gastroenterology Fellow '22
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Causes of Small Bowel Bleeding - Differential Diagnosis
Common Causes:
 • Under age 40 years: Inflammatory Bowel
Bowel Bleeding - Differential ... Plummer-Vinson syndrome ... Ehlers-Danlos syndrome ... , Inherited syndromes ... SmallBowel #Bleeding #Differential
Gallstone Diseases
1. Asymptomatic Stones 75%
2. Biliary Pain 20%
3. Acute Cholecystitis 10%
4. Mirizzi's Syndrome < 0.1%
5. Cholangitis/
Mirizzi's Syndrome ... Fistula/Bouveret's Syndrome ... Gallstone #Diseases #differential
Common Etiologies of Cirrhosis

Inflammation

 - Hepatitis B (15 percent)

 - Hepatitis C (47 percent)

 - Schistosomiasis
disease (Budd-Chiari syndrome ... #Diagnosis #Differential
Secondary Causes of Esophageal Eosinophilia (EoE) - Differential Diagnosis
 • Gastroesophageal reflux disease
 • Eosinophilic gastrointestinal
Eosinophilia (EoE) - Differential ... Hypereosinophilic syndrome ... • Hyper-IgE syndrome ... • Netherton's syndrome ... #Eosinophilic #Differential
Gastrointestinal Causes of Iron Deficiency Anemia
 • Mass lesions: Carcinoma, Large polyps
 • Inflammatory: Reflux esophagitis,
rubber bleb nevus syndrome ... Anemia #Causes #differential
Causes of Low Vitamin B12 Levels
Low vitamin B12 intake - Vegetarianism, chronic alcoholism and older people
Autoimmune
and Sjögren's syndrome ... low #cobalamin #differential
Ileal Pouch Disorders - Differential Diagnosis
 • Surgical/Mechanical: Anastomotic leak, Pelvic sepsis, Sinus, Fistula, Strictures, Efferent
Pouch Disorders - Differential ... Efferent limb syndrome ... Afferent limb syndrome ... Irritable pouch syndrome ... Pouch #Disorders #Differential
Abnormal liver function tests algorithm.
 This figure details the initial response to abnormal liver blood tests.
presence of metabolic syndrome ... Liver #Enzymes #Differential
Causes of a low fecal elastase
Abnormal pancreatic imaging:
Chronic pancreatitis, Pancreatic tumours including cystic disease, Pancreatic resection,
Shwachman-Diamond syndrome ... Irritable bowel syndrome ... elastase #low #differential
Irritable Bowel Syndrome (IBS) - Pathophysiology, Diagnosis and Management Algorithm
Risk factors: Previous acute enteric infection, Female
Irritable Bowel Syndrome ... functional somatic syndromes ... Irritable #Bowel #Syndrome