avalvular

a·val·vu·lar

(ā-val'vyū-lăr),
Nonvalvular; without valves.

a·val·vu·lar

(ā-val'vyū-lăr)
Without valves; not affecting valves.
References in periodicals archive ?
RCC tumor cells can reach the sinonasal region via two routes: the first includes inferior vena cava, lungs, heart, and the maxillary artery; the second involves the communication of the avalvular vertebral venous plexus and the intracranial venous plexus [23].
Ainda, a existencia de um sistema venoso avalvular (exemplificado pelas veias etmoidais, oftalmicas e pelas veias da diploe do osso frontal--chamadas veias de Breschet) justifica a disseminacao do processo inflamatorio por via hematogenica, de maneira retrograda.
En las extremidades inferiores la neoplasia se siembra por embolia de celulas tumorales a traves del plexo de Batson que es avalvular, facilitandose su adherencia al hueso por la coexistencia de insuficiencia venosa iliofemoral (12).
The veins are avalvular and communicate via the basivertebral veins with the internal vertebral venous system.
Fue definido en 1940 por Oscar Batson, quien describio por primera vez una red de vasculatura venosa avalvular, que conecta las venas pelvicas profundas y el plexo vertebral interno.
(9,11,13) This avalvular venous network may provide the necessary conduit between contralateral renal capsular veins and spermatic cord vessels, thus potentially explaining distant seeding from a right RCC to a left testicle, as in our case above.