| Roux-en-Y operation | Anastomosis of the distal end of the divided upper jejunum to the stomach, oesophagus, biliary tract, or other structure and anastomosis of the proximal end to the side of the jejunum a little further distal. (05 Mar 2000) |
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| mika operation | The establishment of a permanent fistula in the bulbous portions of the urethra in order to render the man incapable of procreating; said to be a practice among certain Australian aborigines. Origin: Australian native term (05 Mar 2000) |
| Mikulicz' operation | Excision of bowel in two stages: 1) exteriorizing the diseased area, suturing efferent and afferent limbs together, and closing the abdomen around them, after which the diseased part is excised; 2) at a later time, cutting the spur with an enterotome and closing the stoma extraperitoneally. (05 Mar 2000) |
| Miles' operation | Combined abdominoperineal resection for carcinoma of the rectum. Synonym: Miles resection. (05 Mar 2000) |
| minor operation | A surgical procedure of relatively slight extent and not in itself hazardous to life. (05 Mar 2000) |
| Waters' operation | An extraperitoneal cesarean section with a supravesical approach. (05 Mar 2000) |
| Waterston operation | A surgically created anastomosis between the pulmonary artery and the ascending aorta to palliate adult tetralogy of Fallot. (05 Mar 2000) |
| Webster's operation | An obsolete operation for retrodisplacement of the uterus, consisting of bringing the round ligaments through the perforated broad ligaments and attaching them to each other and to the back of the uterus. Synonym: Webster's operation. (05 Mar 2000) |
| Weir's operation | An obsolete eponym for appendicostomy. (05 Mar 2000) |
| Wertheim's operation | A radical operation for carcinoma of the uterus in which as much as possible of the vagina is excised and there is wide lymph node excision. (05 Mar 2000) |
| morcellation operation | <gynaecology> Vaginal hysterectomy in which the uterus is removed in multiple pieces after being split or partitioned. (05 Mar 2000) |
| commando operation | An operation for malignant tumours of the floor of the oral cavity, involving resection of portions of the mandible in continuity with the oral lesion and radical neck dissection. Synonym: commando operation. (05 Mar 2000) |
| Wheelhouse's operation | An obsolete term for external urethrotomy. (05 Mar 2000) |
| Whipple's operation | Excision of all or part of the pancreas together with the duodenum. Synonym: Whipple's operation. (05 Mar 2000) |
| Whitehead's operation | Excision of haemorrhoids by two circular incisions above and below involved veins, allowing normal mucosa to be pulled down and sutured to anal skin. (05 Mar 2000) |