| atrial myxoma | <cardiology, oncology, tumour> A very rare primary cardiac tumour, composed of connective tissue, located in the left or right atrium. Symptoms include chest pains, shortness of breath, orthopnoea, paroxysmal nocturnal dyspnoea, fainting, palpitations, dizziness and syncope. Diagnosis is confirmed by echocardiogram. Treatment involves the surgical excision of the tumour. (27 Sep 1997) |
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| rabbit myxoma virus | The poxvirus of the genus Leporipoxvirus causing myxomatosis of rabbits. Synonym: myxomatosis virus. (05 Mar 2000) |
| myxoma | <oncology, tumour> A tumour made up of a gelatinous tissue resembling that found in the umbilical cord. Source: Websters Dictionary (01 Mar 1998) |
| myxoma enchondromatosum | <tumour> A benign neoplasm of cartilaginous tissue, i.e., a chondroma, in which the stroma resembles relatively primitive mesenchymal tissue. Synonym: myxoma enchondromatosum. Origin: myxo-+ G. Chondros, cartilage, + -oma, tumour (05 Mar 2000) |
| myxoma fibrosum | <tumour> A benign neoplasm of fibrous connective tissue that resembles primitive mesenchymal tissue. Synonym: fibroma myxomatodes, myxoma fibrosum. Origin: myxo-+ L. Fibra, fibre, + G. -oma, tumour (05 Mar 2000) |
| myxoma lipomatosum | <tumour> A benign neoplasm of adipose tissue in which portions of the tumour resemble mucoid mesenchymal tissue. Synonym: lipoma myxomatodes, myxoma lipomatosum. Origin: myxo-+ G. Lipos, fat, + -oma, tumour (05 Mar 2000) |
| myxoma sarcomatosum | A sarcoma, usually a liposarcoma or malignant fibrous histiocytoma, with an abundant component of myxoid tissue resembling primitive mesenchyme containing connective tissue mucin. (12 Dec 1998) |
| myxoma virus | <virology> A poxvirus (see Poxviridae) that causes myxomatosis. Originally isolated from a species of wild rabbit, Sylvilagus in Brazil, in which it causes a mild nonfatal disease, it was found to be 99% fatal in the European rabbit Oryctolagus. It causes the characteristic, sub cutaneous gelatinous swellings, myxomata and usually kills in 2-5 days. It has been used to control rabbit populations in Australia and Britain, but there are signs that they have developed immunity. (18 Nov 1997) |
| odontogenic myxoma | <tumour> A benign, expansile, multilocular radiolucent neoplasm of the jaws consisting of myxomatous fibrous connective tissue; presumably derived from the mesenchymal components of the odontogenic apparatus. (05 Mar 2000) |
| nerve sheath tumours | Tumours arising in the sheath surrounding the axon of some nerve cells and formed by the plasma membrane of schwann cells in the peripheral nervous sytem and by oligodendrocytes in the central nervous system. Neurofibromas and neurilemmomas are the most commonly occurring tumours of this type. (12 Dec 1998) |
| dural sheath of optic nerve | <anatomy, nerve> The outer sheath around the optic nerve, continuous with the dura mater. Synonym: vagina externa nervi optici, dural sheath of optic nerve. (05 Mar 2000) |
| internal sheath of optic nerve | <anatomy, nerve> The innermost sheath around the optic nerve, continuous with the leptomeninges (pia-arachnoid) and including a cerebrospinal fluid-filled intervaginal space, continuous with the subarachnoid space. Synonym: vagina interna nervi optici. (05 Mar 2000) |
| optic nerve sheath decompression | A venting of the optic nerve sheath into the retrobulbar space, by slitting or by fenestrating the sheath. See: optic nerve sheath fenestration. (05 Mar 2000) |
| optic nerve sheath fenestration | The cutting of a window in the dura of the optic nerve sheath to relieve papilledema and prevent further loss of optic nerve fibres. (05 Mar 2000) |
| external sheath of optic nerve | <anatomy, nerve> The outer sheath around the optic nerve, continuous with the dura mater. Synonym: vagina externa nervi optici, dural sheath of optic nerve. (05 Mar 2000) |