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piles anorectal disorders haemorrhoids fissure in ano rectum anal canal anal canal & rectum anatomy pilonidal sinus fistula in ano rectal prolapse ipaa bowel disease ulcerative colitis uc regional enteritis inflammatory bowel disease ileitis ibd gastroenterolgy crohns disease crohns crohn's colitis cd acute colitis vvf surgery vesico vaginal fistula vesico enteric fistula latzko technique fistula urinary fistula genito urinary fistula urinary tract fistula vvf surgery for periampullary ca allen oldfather whipple whipple's procedure periampullary ca periampullary carcinoma pancreatic cancer ca pancreas whipple surgery whipple procedure whipple's aast splenic injury grading aast grading management of spleen injury abdomen trauma trauma surgery for spleen splenectomy grade of splenic injury splenic injury splenic trauma spleen surgical managaement of colon cancer colon cancer carcinoma colon ca appendix ca colon hemicolectomy left hemicolectomy colonic aganglionic disease congenital disorder pediatric surgery pediatric megacolon megacolon hirschsprung developmental disorder congenital megacolon hirschsprung disease nasoalveolar moulding surgical management of cleft lip cleft lip surgery lip anomaly pediatric anomaly pediatric cleft lip congenital anamoly hare lip cleft lip and palate cleft palate cleft lip