| angiography, digital subtraction | A method of delineating blood vessels by subtracting a tissue background image from an image of tissue plus intravascular contrast material that attenuates the X-ray photons. The background image is determined from a digitised image taken a few moments before injection of the contrast material. The resulting angiogram is a high-contrast image of the vessel. This subtraction technique allows extraction of a high-intensity signal from the superimposed background information. The image is thus the result of the differential absorption of X-rays by different tissues. (12 Dec 1998) |
|---|---|
| angiohyalinosis | Hyaline degeneration of the walls of the blood vessels. Origin: angio-+ G. Hyalos, glass, + -osis, condition (05 Mar 2000) |
| angiohypertonia | Synonym: vasospasm. Origin: angio-+ G. Hyper, over, + tonos, tension (05 Mar 2000) |
| angiohypotonia | Synonym: vasoparalysis. Origin: angio-+ G. Hypo, under, + tonos, tension (05 Mar 2000) |
| angioid | Resembling blood vessels; an arborizing pattern. Origin: angio-+ G. Eidos, resemblance (05 Mar 2000) |
| angioid streaks | Tiny breaks in the elastin-filled tissue in the back of the eye (retinae). These abnormalities are visible to the doctor during an examination using a viewing instrument called an ophthalmoscope. Angioid streaks are seen in patients with pseudoxanthoma elasticum (abbreviated PXE), a rare disorder of degeneration of the elastic fibres with tiny areas of calcification in the skin, back of the eyes (retinae), and blood vessels. Angioid streaks can be associated with blindness. (12 Dec 1998) |
| angioimmunoblastic lymphadenopathy with dysproteinaemia | A lymphoproliferative disorder characterised by generalised lymphadenopathy, hepatosplenomegaly, fever, sweats, weight loss, skin lesions, and pruritus with hypergammaglobulinaemia; occurs primarily in older adults, often with fatal outcome. Proliferation of B-cells, deficiency of T-cells has been demonstrated. Synonym: immunoblastic lymphadenopathy. (05 Mar 2000) |
| angioinvasive | Denoting a neoplasm or other pathologic condition capable of entering the vascular bed. (05 Mar 2000) |
| angiokeratoma | A discrete, pink to red telangiectasia having a tendency to undergo secondary epithelial changes, including acanthosis and hyperkeratosis. An underlying vascular abnormality is present in many cases. The term angiokeratoma is applied to a number of quite distinct conditions which share a common clinical presentation with asymptomatic hyperkeratotic vascular skin lesions and a histological combination of superficial dermal vascular ectasia. (12 Dec 1998) |
| angiokeratosis | The occurrence of multiple angiokeratomas. (05 Mar 2000) |
| angiokinesis | Synonym: vasomotion. Origin: angio-+ G. Kinesis, movement (05 Mar 2000) |
| angiokinetic | Synonym: vasomotor. Origin: angio-+ G. Kinetikos, pertaining to movement (05 Mar 2000) |
| angioleiomyoma | <tumour> A markedly vascular leiomyoma, apparently arising from the smooth muscle of blood vessels. Synonym: angioleiomyoma, angiomyofibroma, angiomyoma. (05 Mar 2000) |
| angiolipofibroma | <tumour> A neoplasm composed of fibroblasts, capillaries, and adipose tissue. Synonym: angiolipofibroma. (05 Mar 2000) |
| angiolipoma | A benign neoplasm composed of a mixture of adipose tissue and blood vessels. (12 Dec 1998) |