| cyst, baker's | A swelling in the space behind the knee (the popliteal space) composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Named after the British surgeon William Morrant Baker (1839-1896). Also called a synovial cyst of the popliteal space. (12 Dec 1998) |
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| cyst, meibomian | Also called a chalazian or a tarsal cyst, an inflammation of the oil gland of the eyelid. (12 Dec 1998) |
| cyst, pilonidal | A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. (12 Dec 1998) |
| cyst, sebaceous | A sebaceous cyst is a rounded swollen area of the skin formed by an abnormal sac of retained excretion (sebum) from the sebaceous follicles. (12 Dec 1998) |
| cyst, synovial, of the popliteal space | A swelling in the space behind the knee (the popliteal space). The swelling is composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Commonly called Baker's cyst. (12 Dec 1998) |
| cyst, tarsal | Also called a chalazian or a Meibomian cyst, an inflammation of the oil gland of the eyelid. (12 Dec 1998) |
| cyst, thyrolingual | A thyrolingual cyst is a fluid-filled sac that is present at birth and located in the midline of the neck. A thyrolingual cyst is a result of incomplete closure of a segent of a tube-like structure (the thyrolingual duct) that is present, and normally closes, as the embryo develops. A thyrolingual cyst is also called a thyroglossal cyst. (12 Dec 1998) |
| cystacanth | The fully developed larva of Acanthocephala, infective to the final host and with an inverted fully formed proboscis characteristic of the adult worm. Origin: cyst-+ G. Akantha, thorn or spine (05 Mar 2000) |
| cystadenocarcinoma | A malignant neoplasm derived from glandular epithelium, in which cystic accumulations of retained secretions are formed. The neoplastic cells manifest varying degrees of anaplasia and invasiveness, and local extension and metastases occur. Cystadenocarcinomas develop frequently in the ovaries, where pseudomucinous and serous types are recognised. (12 Dec 1998) |
| cystadenocarcinoma, mucinous | A malignant cystic or semisolid tumour most often occurring in the ovary. Rarely, one is solid. This tumour may develop from a mucinous cystadenoma, or it may be malignant at the onset. The cysts are lined with tall columnar epithelial cells; in others, the epithelium consists of many layers of cells that have lost normal structure entirely. In the more undifferentiated tumours, one may see sheets and nests of tumour cells that have very little resemblance to the parent structure. (hughes, obstetric-gynecologic terminology, 1972, p184) (12 Dec 1998) |
| cystadenocarcinoma, papillary | An adenocarcinoma in which the tumour elements are arranged as finger-like processes or as a solid spherical nodule projecting from an epithelial surface. (12 Dec 1998) |
| cystadenocarcinoma, serous | A malignant cystic or saemicystic neoplasm. It often occurs in the ovary and usually bilaterally. The external surface is usually covered with papillary excrescences. Microscopically, the papillary patterns are predominantly epithelial overgrowths with differentiated and undifferentiated papillary serous cystadenocarcinoma cells. Psammoma bodies may be present. The tumour generally adheres to surrounding structures and produces ascites. (12 Dec 1998) |
| cystadenoma | A benign neoplasm derived from glandular epithelium, in which cystic accumulations of retained secretions are formed. In some instances, considerable portions of the neoplasm, or even the entire mass, may be cystic. (12 Dec 1998) |
| cystadenoma, mucinous | A multilocular tumour produced by the epithelial cells of the ovary and having mucin-filled cavities. The great majority of these tumours is benign. (12 Dec 1998) |
| cystadenoma, papillary | A benign neoplasm of the ovary. (12 Dec 1998) |