| duplication cyst | A congenital cystic malformation attached to or originating from any part of the alimentary canal, from the base of the tongue to the anus, which reproduces the structure of the adjacent alimentary tract. (05 Mar 2000) |
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| implantation cyst | Intradermal or subcutaneous saclike structure, the wall of which is stratified epithelium containing keratohyalin granules. (12 Dec 1998) |
| incisive canal cyst | A cyst in or near the incisive canal, arising from proliferation of epithelial remnants of the nasopalatine duct; the most common maxillary development cyst. Synonym: median anterior maxillary cyst, nasopalatine duct cyst. (05 Mar 2000) |
| inclusion cyst | Intradermal or subcutaneous saclike structure, the wall of which is stratified epithelium containing keratohyalin granules. (12 Dec 1998) |
| involution cyst | A mammary cyst occurring at the menopause, due to fibrocystic disease. (05 Mar 2000) |
| odontogenic cyst | A cyst derived from odontogenic epithelium. Origin: odont-+ G. Genos, birth, origin, + suffix -ic, pertaining to (05 Mar 2000) |
| odontogenic cyst, calcifying | A mixed radiolucent-radiopaque lesion of the jaws with features of both a cyst and a solid neoplasm. It is characterised microscopically by an epithelial lining showing a palisaded layer of columnar basal cells, presence of ghost cell keratinization, dentinoid, and calcification. (12 Dec 1998) |
| oil cyst | A cyst resulting from loss of the epithelial lining of a sebaceous, dermoid, or lacteal cyst, or from the subcutaneous injection of oil or fat material. (05 Mar 2000) |
| omphalomesenteric cyst | Cystic lesion found within the umbilical cord, presumed to develop from remnants of the omphalomesenteric duct early in gestation. May be found on antenatal ultrasound. Synonym: omphalomesenteric duct cyst. (05 Mar 2000) |
| omphalomesenteric duct cyst | Cystic lesion found within the umbilical cord, presumed to develop from remnants of the omphalomesenteric duct early in gestation. May be found on antenatal ultrasound. Synonym: omphalomesenteric duct cyst. (05 Mar 2000) |
| oophoritic cyst | <gynaecology> The ovary will form a fluid filled cyst on the surface of the ovary each month after an egg is released from the ovary during normal ovulation. Larger cysts can cause pain and bleeding (rupture). (27 Sep 1997) |
| osseous hydatid cyst | A morphological form of hydatid cyst caused by Echinococcus granulosus, and found in the long bones or the pelvic arch of humans if the embryo is filtered out in bony tissue; in this site no limiting membrane forms and the cyst grows in an uncontrolled fashion, producing cancellous structures and inducing fracture, followed by spread to new sites. (05 Mar 2000) |
| ovarian cyst | <gynaecology> The ovary will form a fluid filled cyst on the surface of the ovary each month after an egg is released from the ovary during normal ovulation. Larger cysts can cause pain and bleeding (rupture). (27 Sep 1997) |
| Tarlov's cyst | A perineural cyst found in the proximal radicles of the lower spinal cord; it is usually productive of symptoms. (05 Mar 2000) |
| tarry cyst | A cyst or collection of old blood having a tarry or black, sticky appearance; usually due to endometriosis. (05 Mar 2000) |