Inflammation; from fungal/viral infection
Carcinoma of the oral cavity

Oesophagitis; due to GORD or infection
Oesophageal varices; distended veins from liver cirrhosis & portal hypertension
Plummer-Vinson syndrome; dysphagia, peristalsis (abnormal) & mucosal webs
Squamous Cell Carcinoma of Oesophagus
Hiatus Hernia; Sliding > Rolling

Acute (erosive) Gastritis; typically following alcohol consumption > resolution
Chronic Gastritis; H.Pylori or autoimmune aetiology
Reactive Gastritis
Acute & Chronic Peptic Ulcers
Adenocarcinoma; grave prognosis

Diverticula; True or false depending on layer involvement
Meckel's Diverticulum; True
Diverticulosis; False in Jejenum
Crohn's disease; recurrent granulomatous inflammation = possible autoimmune association
Tumours; rare in small intestine

Volvulus; twisting & rotation of loops of the bowel > ileus, vascular obstruction & gangrene
Menconium Ileus; menconium aetiology
Intussusception; one aspect of bowel invaginated antoher aspect (I.e. telescoping)

Ulcerative Colitis; formation of pseudopolyps between ulcerations
Diverticulosis; -ve in sigmoid & rectum
Familial Polyposis Coli (Benign tumour); thousands of adenomatous formed (Autosomal dominant)
Peutz-Jeghers Syndrome; Polyp formation with melanin pigmentation (Autosomal dominant)
Gardner's Syndrome; presence of osteomas (Autosomal dominant)
Turcot's Syndrome; presence of gliomas (Autosomal recessive)
Colonic Carcinoma; due to genetics, diet, chronic constipation, bile acid metabolism, pre-malignant conditions