| RP | radial pulse; radiopharmaceutical; rapid processing [of film]; Raynaud phenomenon; reactive protein;... |
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| RPC | reactive perforating collagenosis; relapsing polychondritis; relative proliferative capacity |
| R-EAE | Relapsing experimental autoimmune encephalomyelitis |
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| RR | Relapsing-remitting |
| RR-MS | relapsing remitting MS |
| RR MS | relapsing remitting multiple sclerosis |
| recurrent appendicitis | Repeated episodes of right lower quadrant abdominal pain attributed to recurrence of inflammation of the appendix in an individual who did not have an appendectomy for prior episodes. Synonym: relapsing appendicitis. (05 Mar 2000) |
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| perforating appendicitis | Inflammation of the appendix leading to perforation of the wall of the appendix into the peritoneal cavity, resulting in peritonitis. (05 Mar 2000) |
| chronic appendicitis | Fibrous adhesions, scarring, or deformity of the appendix following subsidence of acute appendicitis; fibrous obliteration of the distal lumen is not abnormal in older persons; term frequently used to refer to repeated mild attacks of acute appendicitis. (05 Mar 2000) |
| stercoral appendicitis | Appendicitis following a lodgment of faecal material in the appendix. (05 Mar 2000) |
| subperitoneal appendicitis | Appendicitis of a subperitoneally displaced appendix. (05 Mar 2000) |
| suppurative appendicitis | Acute appendicitis with purulent exudate in the lumen and wall of the appendix. (05 Mar 2000) |
| obstructive appendicitis | Acute appendicitis due to infection of retained secretion behind an obstruction of the lumen by a fecalith or some other cause, including carcinoma of the caecum. (05 Mar 2000) |
| focal appendicitis | Acute appendicitis involving only part of the appendix, sometimes at the site of, or distal to, an obstruction of the lumen. (05 Mar 2000) |
| foreign-body appendicitis | Appendicitis caused by obstruction of the lumen of the appendix by a foreign substance, such as a particulate foreign body. (05 Mar 2000) |
| left-sided appendicitis | Appendicitis occurring on the left side of the abdomen, usually the left-lower quadrant, due to abnormal rotation of the gut (such as situs inversus). (05 Mar 2000) |
| lumbar appendicitis | A retrodisplaced appendix in the lumbar region. (05 Mar 2000) |