varix


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varix

[′var·iks]
(invertebrate zoology)
A conspicuous ridge across each whorl of certain univalves marking the ancestral position of the outer lip of the aperture.
(medicine)
A dilated and tortuous vein, artery, or lymphatic vessel.
References in periodicals archive ?
Outer lip lacking external varix, but thickened internally and bearing up to 15 denticles; denticles ridge-like, more or less in a single row and usually alternating in strength, that nearest columella usually strongest and separated from basal columella tooth by a U-shaped notch; edge of outer lip flaring; interior highly nacreous, not spirally lirate (except at apertural thickening), but somewhat angled beneath cords of external surface.
Colour: First teleoconch whorl uniform white, later whorls pale buff with faint brown spots on primary spiral cords; flared outer lip and external varix with brown marks in intervals between paler primary spiral cords.
75[degrees]; protoconch sunken and apex thus appearing truncated; suture indented, but somewhat adpressed, narrowly channelled, inserted at level of subperipheral cord, but descending below this just prior to outer lip; outer lip with well-developed subterminal varix.
Colour: Spire apex uniform white, later whorls (3rd onwards) with pale fawn ground patterned with darker, brownish markings; markings initially in the form of axial bands or blotches, but penultimate and last adult whorls rather more randomly mottled; subterminal varix and flaring edge of outer lip with brownish spiral bands in cord intervals; precise shade and density of colour pattern variable between individuals, some specimens very sparsely marked, but outer lip varix evidently patterned in all; cord intervals with pink/green iridescence; living and fresh specimens with a buffish intritacalx deposit.
Zimmerman thus advanced the hypothesis that the development of the varix may be secondary to compression of vertebral veins by the adjacent disc, thereby leading to dilation and thrombosis.
6) On MRI, the varix appears as a dilated, serpiginous flow void in the epidural space.
We have presented a case of symptomatic epidural varix.