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final year mbbs lecture cholelithiasis gallstones final year lecture chest trauma pneumothorax chest intubation venous system varicose veins dvt deep venous thrombosis venous insufficiency anantomy pathology skin physiology tricuspid valve pulmonary valve aortic valve solitary thyroid nodule goitre multinodular goitre mng diffuse goitre radial nerve ulnar nerve median nerve upper limb nerves gallstone cholangitis pseudocyst pancreas pancreatic abscess haemorrhagic pancreatitis complicated pancreatitis acute pancreatitis cholecystitis penetrating abdominal injuries stab wound colonic injuries colonic trauma management hinchey classification diverticulitis ergonomics of laparoscopy core laparoscopic skills basic laparoscopic skills assessment medical education bed wetting urinary incontinence blood in urine haematuria meconium newborn perforation of intestine gas under diaphragm mitral valve rheumatic fever