Abdominal Wall
    Hernias

Esophagus
   Infectious
       Candida
       Viral Esophagitis
   Inflammatory
       
Esophagitis
       GERD
   Toxic effects of caustic agents
       
Acid
       Alkali
   Motor abnormalities
       
Spasms
   Structural disorders
       Boerhaave’s syndrome (Esophageal Rupture)
       Diverticula
       Foreign body- fishbone, Battery
       Hernias: hiatal, paraesophageal
       Mallory-Weiss syndrome
       Stricture and stenosis
       Tracheoesophageal fistula
       Varices
   Esophageal Tumors

Liver
   Cirrhosis
       Alcoholic
       Biliary Obstruction
       Drug-induced
   Hepatorenal failure
       Acetaminophen Overdose
   Infectious
       Liver Abscess
       Hepatitis
   Liver Tumors
       
Hepatocellular Carcinoma
   Hepatic Encephalopathy

Gall Bladder and Biliary Tract
     Cholangitis
     Cholecystitis
     Cholelithiasis
     Choledocholithiasis
     Tumors

Pancreas
    Pancreatitis
    Pancreatic tumor

Peritoneum

    Spontaneous bacterial peritonitis
    Abdominal compartment sx

Stomach

   Infectious
   Inflammatory
     
Gastritis
       Peptic ulcer disease
       Hemorrhage
       Perforation
   Structural disorders
       Congenital Pyloric stenosis
       Foreign body
   Tumors
      
Stomach Cancer
   Gastroparesis

Small Bowel
   Infectious disorders
   Inflammatory disorders
      Regional enteritis
      Crohn’s disease
      Gluten enteropathy
Motor abnormalities
      Small Bowel Obstruction
      Paralytic ileus
Structural disorders
     Aortoenteric fistula
     Congenital anomalies
     Intestinal malabsorption
     Meckel’s diverticulum
Tumors
Vascular insufficiency

Large Bowel
   Infectious
     Antibiotic-associated
           Clostridium Difficile
     Bacterial
           Hemolytic Uremic Syndrome
     Parasitic
     Viral

   Inflammatory disorders
      Appendicitis
      Necrotizing enterocolitis (NEC)
      Radiation colitis
      Ulcerative colitis
      Neutropenic enterocolitis/Typhlitis
 Motor abnormalities
      Hirschsprung’s disease
      Irritable bowel
      Obstruction
 Structural disorders
      Congenital anomalies
      Diverticula
      Intussusception
      Volvulus
      Malrotation
      Tumors

Rectum and Anus
   Infectious disorders
       Perianal/Anal abscess
       Perirectal abscess
       Pilonidal cyst and abscess
   Inflammatory disorders
       Proctitis
   Structural disorders
       Anal fissure
       Anal fistula
       Congenital anomalies
       Foreign body
       Hemorrhoids
       Rectal prolapse
   Tumors

Spleen
     Asplenism
     Splenomegaly
     Vascular insufficiency/Infarction

Post-surgical Complications
     Bariatric surgery
     Ostomy