larva mi·grans (m  gr nz )n. pl. larvae mi·gran·tes (m -grnt z) A larval worm, typically a nematode, that wanders in the host tissues but does not develop to the adult stage. |
larva migrans.
larva [lahr´vah] (pl. lar´vae) (L.)
1. an independent, immature stage in the life cycle of an animal, in which it is markedly unlike the parent and must undergo changes in form and size to reach the adult stage.
2. something that resembles such an immature animal.
larva cur´rens a rapidly progressive creeping eruption caused by autoinoculation of larvae of Strongyloides stercoralis that migrate to and mature at the anus in intestinal infections with the parasite.
cutaneous larva mi´grans (larva mi´grans) a convoluted threadlike skin eruption that appears to migrate, caused by the burrowing beneath the skin of roundworm larvae, particularly of the species Ancylostoma; similar lesions are caused by the larvae of botflies. Called also creeping eruption.
ocular larva migrans infection of the eye with larvae of the roundworm Toxocara canis or T. cati, which may lodge in the choroid or retina or migrate to the vitreous; on the death of the larvae, a granulomatous inflammation occurs, the lesion varying from a translucent elevation of the retina to massive retinal detachment and pseudoglioma.
visceral larva migrans a condition due to prolonged migration by the skin larvae of animal nematodes in human tissue other than skin; commonly caused by larvae of the roundworms Toxocara canis and T. cati.
larva migrans
Parasitology An infestation by non-human nematodes that penetrate and migrate through the skin, but which cannot complete their life cycle in humans
Larva migrans
Cutaneous LM Due to dog & cat hookworm, Ancylostoma braziliense, the larvae of which migrate a few mms/day, producing pruritic serpiginous tracks in the stratum germinatum that are visible below the skin
Visceral LM Due to dog–Toxocara canis or cat parasites–T cati, the life cycles of which in their usual hosts resemble that of Ascaris lumbricoides in humans; in VLM, embryonated eggs are accidentally ingested and hatch in the
intestine, penetrating the mucosa, aimlessly wander through the circulation, passing to liver and/or lung vessels and may be fatal if they involve the myocardium or CNS; in the eye, the resulting retinal granuloma mimics retinoblastoma
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