| Smith's operation | A surgical technique for removal of cataract within the capsule. Synonym: Smith's operation. (05 Mar 2000) |
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| Soave operation | Endorectal pull-through for treatment of congenital megacolon. (05 Mar 2000) |
| Spinelli operation | An operation splitting the anterior wall of the prolapsed uterus and reversing the organ preliminary to reduction. (05 Mar 2000) |
| Naffziger operation | Orbital decompression for severe malignant exophthalmos by removal of the lateral and superior orbital walls. (05 Mar 2000) |
| stapes mobilization operation | Now infrequently used operation involving fracture of tissue immobilizing the stapes to restore hearing; especially used in patients with otosclerosis. (05 Mar 2000) |
| Stoffel's operation | Division of certain motor nerves for the relief of spastic paralysis. (05 Mar 2000) |
| Stookey-Scarff operation | An operation to establish an opening from the third ventricle to the prechiasmal and interpeduncular cisterns (Stookey-Scarff operation) or from the third ventricle to the interpeduncular cistern (Dandy operation). (05 Mar 2000) |
| Sturmdorf's operation | Conical removal of the endocervix. (05 Mar 2000) |
| Nissen's operation | Mobilization of the lower end of the oesophagus and plication of the fundus of the stomach around it (fundic wrapping) in the treatment of gastroesophageal reflux that may be associated with various disorders, such as hiatal hernia. (12 Dec 1998) |
| subcutaneous operation | An operation, as for the division of a tendon, performed without incising the skin other than by a minute opening made by the entering knife. (05 Mar 2000) |
| Norton's operation | Extraperitoneal cesarean section by a paravesical approach. (05 Mar 2000) |
| Norwood's operation | In infants with subaortic stenosis and tricuspid atresia; the pulmonary artery is divided and both ends are attached to the aorta, the distal end via a prosthetic graft. (05 Mar 2000) |
| Dana's operation | Section of posterior spinal root. Synonym: Dana's operation. (05 Mar 2000) |
| Dandy operation | More specifically see: third ventriculostomy, trigeminal rhizotomy. (05 Mar 2000) |
| Daviel's operation | Extracapsular cataract extraction. (05 Mar 2000) |