| Lesshaft's triangle | A triangular space bounded above by the end of the last rib and the serratus posterior inferior muscle, anteriorly by the internal oblique, and posteriorly by the quadratus lumborum; lumbar hernia occurs in this space. Synonym: Lesshaft's triangle. (05 Mar 2000) |
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| Lieutaud's triangle | A triangular smooth area at the base of the bladder between the openings of the two ureters and that of the urethra. Synonym: trigonum vesicae, Lieutaud's body, Lieutaud's triangle, Lieutaud's trigone, vesical triangle. (05 Mar 2000) |
| lumbar triangle | An area in the posterior abdominal wall bounded by the edges of the latissimus dorsi and external oblique muscles and the iliac crest; herniations occasionally occur here. Synonym: trigonum lumbale, Petit's lumbar triangle. (05 Mar 2000) |
| lumbocostoabdominal triangle | An irregular area bounded by the serratus posterior inferior, obliquus externus, obliquus internus, and erector spinae muscles. (05 Mar 2000) |
| Abbe operation | Use of an Abbe flap in plastic surgery of the lips. (05 Mar 2000) |
| Arie-Pitanguy operation | A procedure to reduce a large breast by a lozenge-shaped resection of tissue from its inferior pole. Synonym: Arie-Pitanguy mammaplasty. (05 Mar 2000) |
| Arlt's operation | Transplantation of the eyelashes back from the edge of the lid in trichiasis. (05 Mar 2000) |
| arterial switch operation | Operation for complete transposition of the great arteries; the most common way to repair this defect consists of switching the aorta and pulmonary arteries and implanting the coronary arteries into the neoaorta (the original pulmonary artery). (05 Mar 2000) |
| Baldy'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) |
| Ball's operation | Division of the sensory nerve trunks supplying the anus, for relief of pruritus ani. (05 Mar 2000) |
| Barkan's operation | Goniotomy for congenital glaucoma under direct observation of the anterior chamber angle. (05 Mar 2000) |
| Bassini's operation | An operation for an inguinal hernia repair; after reduction of the hernia, the sac is twisted, ligated, and cut off, then a new inguinal canal is made by uniting the edge of the internal oblique muscle to the inguinal ligament, placing on this the cord, and covering the latter by the external oblique muscle. (05 Mar 2000) |
| Baudelocque's operation | An incision through the posterior cul-de-sac of the vagina for the removal of the ovum, in extrauterine pregnancy. (05 Mar 2000) |
| Belsey Mark IV operation | A transthoracic anti-reflux procedure; it restores a 3 to 4 cm length of intraabdominal oesophagus, maintains a narrow diameter of the distal oesophagus by a gastric fundoplication. (05 Mar 2000) |
| Billroth's i operation | <procedure, surgery> The excision of the pylorus with end-to-end anastomosis of the stomach and the duodenum. (27 Sep 1997) |