A non-midline spheno-orbital encephalocele in a newborn.

Basal encephaloceles in western countries occur in 1 of every 35 000-40 000 live births; with an incidence of less than 10% they are the least common of all encephaloceles. Certain subtypes such as transsphenoidal variants may be as rare as 1 in 700 000 live births. These rare encephaloceles are classified into five anatomic types: spheno-ethmodial, transsphenoidal, spheno-orbital, transethmoidal, and spheno-maxillary.

The position effect in mice on day 19.

This investigation on the position effect in mice on day 19 was based on a total of 610 fetuses from 51 litters of NMRI mice. The relative position of each fetus was determined by setting the distance from the center of each placenta to the cervix in relation to the total length of the uterine horn. After cessation of shrinkage due to fixation, the umbilical-cord and remaining membranes were removed and the fetuses were weighed to the nearest 0.