1. OESOPHAGUS
   1. CONGENITAL ANOMALIES
      1. Atresia
      2. Tracheo esophageal fistula
   2. MUSCULAR DYSFUNCTION
      1. Achlasia
      2. Hiatus hernia
      3. Diverticula
         1. congenital
         2. Acqiured
      4. Webs and rings
   3. HEMATEMESIS
      1. varices
      2. Mallory-Weiss syndrome
      3. Rupture of esophagus
      4. Other causes
   4. INFLAMMATORY LESION
      1. Reflux esophagitis
      2. Barret`s esophagitis
      3. Infectious esophagitis
      4. other causes
   5. TUMOURS
      1. Carcinoma
   6. MORPHOLOGY
      1. SCC
      2. Adenocarcinoma
      3. Other ca
2. STOMACH
   1. TEST FOR GASTRIC SECRETION
      1. Gastric acid secretion
      2. Pepsin secretion
      3. Mucus
      4. Intrinsic factor
   2. TEST FOR GASTRIN
      1. Serum gastrin
      2. Gastrin provocation
   3. CONGENITAL ANOMALY
      1. Pancreatic heterotopia
      2. Pyloric stenosis
   4. MISCELLANOUS CONDITION
      1. Bezoars
      2. A/c dilatation
      3. Gastric rupture
   5. INFLAMMATION
      1. Gastritis
         1. A/c Gastritis
         2. C/c Gastritis
      2. Peptic ulcer
   6. HEAMATEMESIS
   7. TUMORS
      1. TUMOUR LIKE
         1. Hyperplastic polyp
         2. Hamartoma polyp
      2. BENIGN
         1. Adenoma
         2. Stromal tumors
      3. MALIGNANT
         1. Gastric carcinoma
         2. Leomyosarcoma
         3. Leomyoblastoma
         4. Carcinoid tumor
         5. Gut lymphoma
3. SMALL INTESTINE
   1. CONGENITAL ANOMALY
      1. Intesinal atresia
      2. Meckel`s diverticulum
      3. Intestinal malrotation
   2. INTESTINAL OBSTRUCTION
      1. Peritoneal adhesion
      2. Hernia
      3. Intussuception
      4. Volvulus
   3. ISCHEMIC BOWEL DISEASE
      1. Transmural infarction
      2. Mural and mucosal infarction
      3. Ischemic colitis
      4. Necrotising enterocolitis
   4. INFLAMMATORY BOWEL DISEASE
      1. Cohn`s disease
      2. Ulcerative colitis
   5. other INFLAMMATORY LESIONS
      1. Bacterial food poisoning
      2. Enteric fever
      3. Intestinal TB
      4. Infective enterocolitis
      5. Dysentry
      6. Psuedo membraneuos enterocolitis
   6. MALABSORPTION SYNDROME
      1. Coeliac sprue
      2. Collagenous sprue
      3. Tropical sprue
      4. Whipple`s d/s
      5. Protein losing enteropathy
   7. SMALL INTESTINAL TUMOURS
      1. Carcinoid tumor
4. LARGE INTESTINE
   1. CONGENITAL ANOMALY
      1. Hirschsprung`s D/s
   2. COLITIS
      1. Ischemic bowel d/s
         1. Membraneous colitis
      2. Inflammatory bowel d/s
         1. Crohn`s d/s
         2. Ulcerative colitis
      3. Other lesion
         1. Ischemic colitis
         2. Necrotising enterocolitis
         3. Psuedo membraneuos enterocolitis
   3. MISCELLANEOUS LESION
      1. Diverticulosis coli
      2. Melanosis coli
      3. Piles
      4. Subtopic 4
5. APPENDIX
6. PERITONEUM