| protozoan cyst | Infectious form of many protozoan parasites such as Entamoeba histolytica, Giardia lamblia, Balantidium coli, etc., usually passed in the faeces and provided with a highly condensed cytoplasm and resistant cell wall. (05 Mar 2000) |
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| heterotrophic oral gastrointestinal cyst | A cyst of the oral cavity lined by gastric or intestinal mucosa from misplaced embryonic rests. (05 Mar 2000) |
| pseudomucinous cyst | A cyst containing a gelatinous fluid, formerly thought to differ significantly from mucin, occurring especially in the ovary. (05 Mar 2000) |
| sebaceous cyst | A closed sac (sebaceous gland) within the tissue containing oily or fatty semi-solid material. These cysts are found most commonly on the genitalia, vulva or labia. Features include a nontender, small lump in the skin. Sebaceous cysts which turn red or tender may require treatment with oral antibiotics. Warm wet compresses may help the cyst expel some of its contents. Surgical excision of the cyst may be necessary to prevent recurrence. (27 Sep 1997) |
| secretory cyst | A cyst resulting from some obstruction to the excretory duct of a gland. Synonym: distention cyst, secretory cyst. (05 Mar 2000) |
| seminal vesical cyst | A cyst, usually congenital, of the seminal vesicle. (05 Mar 2000) |
| sequestration cyst | A collection of cancerous cells which form cysts that contain one or more of the three primary embryonic germ layers: skin, hair or teeth. (27 Sep 1997) |
| serous cyst | A cyst containing clear serous fluid, such as a hygroma. (05 Mar 2000) |
| hydatid cyst | A cyst formed in the liver, or, less frequently, elsewhere, by the larval stage of Echinococcus, chiefly in ruminants; two morphological forms caused by Echinococcus granulosus are found in humans: the unilocular hydatid cyst and the osseous hydatid cyst; a third form in humans is the alveolar hydatid cyst, caused by Echinococcus multilocularis. Synonym: echinococcus cyst, hydatid. (05 Mar 2000) |
| hydatid cyst of morgagni | <radiology> Paraovarian cyst near fimbria or broad ligament, serous fluid, no clinical significance, wolffian duct remnant (probably) (12 Dec 1998) |
| simple bone cyst | <radiology> Unicameral or solitary bone cyst, lytic, unilocular, central, meta-diaphyseal, humerus (most common site), age 0 - 10 yrs Differential diagnosis: bubbly bone lesions (12 Dec 1998) |
| solitary bone cyst | A unilocular cyst containing serous fluid and lined with a thin layer of connective tissue, occurring usually in the shaft of a long bone in a child. Synonym: idiopathic bone cavity, osteocystoma, simple bone cyst, traumatic bone cyst, unicameral bone cyst. (05 Mar 2000) |
| spleen cyst | <radiology> True cyst, congenital, epithelial lining, pseudocyst, four times more common than true cysts, no epithelial lining, with or without calcification in wall (especially with haematoma or echinococcus), associated with trauma in childhood, metastasis, abscess, echinococcal cyst (12 Dec 1998) |
| nabothian cyst | <radiology> Chronic cervicitis most likely to be inflammatory stenosis of cervical glands most likely to be retention most likely to be cyst Differential diagnosis: cystic mass of cervix, ectopic pregnancy, adenomyosis (12 Dec 1998) |
| nasoalveolar cyst | A soft tissue cyst located near the attachment of the ala over the maxilla; probably derived from the lower anterior part of the nasolacrimal duct. Synonym: Klestadt's cyst, nasolabial cyst. (05 Mar 2000) |