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].
Metastatic Renal Cell Carcinoma Presenting as a Paranasal Sinus Mass: The Importance of Differential Diagnosis
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.
Rhinosinusitis complications/Complicacoes das rinossinusites/Complicaciones de la rinosinusitis
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).
Acrometastasis de miembros inferiores
The veins are avalvular and communicate via the basivertebral veins with the internal vertebral venous system.
Pre-sacral venous plexus bleed during laparoscopic/open APR: a rare case report
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.
Endoscopia epidural. Desde el endoscopio rigido hasta el microprocesador
(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.
Metastatic renal cell carcinoma to the testis: a case report and review of the literature
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