| OROS | oral osmotic |
|---|---|
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
| OSCC | oral squamous cell carcinoma |
| OTD | oculotrichodysplasia; oral temperature device; organ tolerance dose |
| wolffian cyst | A cyst lying in the broad ligaments of the uterus and arising from any mesonephric structures. (05 Mar 2000) |
|---|---|
| multilocular cyst | A cyst containing several compartments formed by membranous septa. Synonym: compound cyst. (05 Mar 2000) |
| multilocular hydatid cyst | A hydatid cyst of a multiloculate type, usually in the liver, caused by Echinococcus multilocularis, adults of which are in foxes; larvae (alveolar hydatid) are found chiefly in microtine rodents, but also among humans such as trappers and others handling pelts of infected foxes and other carnivores; growth is by exogenous budding and is not limited by an outer laminated membrane as in the hydatid cyst from E. Granulosus; necrosis, cavitation, contiguous spread, and death usually ensue. Synonym: multilocular hydatid cyst, multiloculate hydatid cyst. (05 Mar 2000) |
| Cowper's cyst | A retention cyst of a bulbourethral gland. (05 Mar 2000) |
| popliteal cyst | A synovial cyst in the popliteal space arising from the semimembranous bursa or the knee joint. (12 Dec 1998) |
| myxoid cyst | 1. A knot or knotlike mass. 2. <anatomy> A general term for a group of nerve cell bodies located outside the central nervous system, occasionally applied to certain nuclear groups within the brain or spinal cord, for example basal ganglia. 3. <oncology, tumour> A benign cystic tumour occurring on a aponeurosis or tendon, as in the wrist or dorsum of the foot, it consists of a thin fibrous capsule enclosing a clear mucinous fluid. (18 Nov 1997) |
| posttraumatic leptomeningeal cyst | A persistent cystic accumulation of cerebrospinal fluid with progressive loss of bone and dura, occurring at the site of a previous fracture. (05 Mar 2000) |
| haemorrhagic cyst | A cyst containing blood or resulting from the encapsulation of a haematoma. Synonym: blood cyst, haematocele, haematocyst, sanguineous cyst. (05 Mar 2000) |
| cyst | <anatomy> Any closed cavity or sac that is lined by epithelium often contains liquid or semi-solid material. Origin: Gr. Kystis = sac, bladder (09 Oct 1997) |
| 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) |
| 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) |