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.
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.