In two series of 20 cases, each series consisting of 20 patients 38-39, “intraoperative obstruction” was reported in 19 and 30% of the cases with no explanation for the etiology.
En dos series de 20 casos, ambas de 20 pacientes cada una 38,39, se reporta “obstrucción intraoperatoria” en 19 y 30% de los casos, no explicando la etiología.