| ectopic hormone | A hormone formed by tissue outside the normal endocrine site of production; e.g., adrenocorticotropic hormone produced by a bronchogenic carcinoma. Synonym: inappropriate hormone. (05 Mar 2000) |
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| ectopic impulse | An electrical impulse from an area of the heart other than the sinus node. (05 Mar 2000) |
| ectopic pacemaker | Any pacemaker other than the sinus node. (05 Mar 2000) |
| ectopic pairing | Pairing of heterochromatin randomly, without regard to whether they are homologous. (09 Oct 1997) |
| ectopic pancreas | <radiology> Site: stomach (most common), small bowel, Meckel diverticulum, gallbladder, spleen prevalence: 10% at autopsy, 1:500 at operation (12 Dec 1998) |
| ectopic pinealoma | <tumour> An obsolete term for an undifferentiated neoplasm resembling a pinealoma, usually found near the pituitary gland; believed by some to be an undifferentiated teratoma. (05 Mar 2000) |
| ectopic rhythm | Any cardiac rhythm arising from a centre other than the normal pacemaker, the sinus node. (05 Mar 2000) |
| ectopic schistosomiasis | A clinical form of schistosomiasis that occurs outside of the normal site of parasitism (mesenteric vein or hepatic portals); may result from accidental blood-borne transport of schistosome eggs or, rarely, adult worms, to various unusual sites such as the skin, brain, or spinal cord. (05 Mar 2000) |
| ectopic tachycardia | A tachycardia originating in a focus other than the sinus node, e.g., atrial, A-V junctional, or ventricular tachycardia. (05 Mar 2000) |
| ectopic teratosis | A teratosis in which the organs or other parts are misplaced. (05 Mar 2000) |
| ectopic testis | A variant of undescended testis wherein testicular position is outside the usual pathway of descent. See: testis ectopia. (05 Mar 2000) |
| ectopic thyroid | <radiology> Usually connects to normal thyroid, sites: lingual thyroid, thyroglossal duct remnant, anterior mediastinum (retrosternal thyroid), btw trachea and oesophagus, struma ovarii (teratoma variant), use pertechnetate first (rather than I-131) because of lower dose (12 Dec 1998) |
| ectopic ureter | Opens somewhere other than the bladder wall. (05 Mar 2000) |
| abdominal pregnancy | The implantation and development of the ovum in the peritoneal cavity, usually secondary to an early rupture of a tubal pregnancy; very rarely, primary implantation may occur in the peritoneal cavity. Synonym: abdominocyesis, intraperitoneal pregnancy. (05 Mar 2000) |
| alcohol, pregnancy | The consumption of alcohol during pregnancy carries the danger of damaging the foetus. (12 Dec 1998) |