PMC

A schematic drawing of our hypothesis concerning the IVH development in this case. Infratentorial SDH, which occurred owing to injury of bridging veins (indicated with x) from the straight sinus (SS) near the suprapineal recessus. The ependyma of the suprapineal recessus was perforated below the entry of ICVs (bold black arrow) and thus IVH (indicated with bold black arrow) developed in the 3^rd ventricle (III), the bilateral lateral ventricle (LV), and the 4^th ventricle (IV)

Mesenteries and peritoneal ligaments build into several larger and less pronounced peritoneal cul de sacs (called fossae, recessus and/or fovea).
(A) Left paraduodenal recessus, located at the duodenojejunal angle where the duodenum is entering again the peritoneal cavity, and subdivided into: a) the superior duodenal fossa, b) the inferior duodenal fossa, c) the retroduodenal fossa and d) the paraduodenal fossa. (B) The sigmoid recessus is found on the outside of the colon sigmoideum, approximately in its middle (arrow). (C) The supravesical fossae are located between the remnants of the urachus and the left or right umbilical artery. (D) The recessus ileocaecalis superior and inferior are located at the junction of the ileum with the caecum.

Computed tomographic (CT) scan on day 1 after birth. (a) Axial images revealing intraventricular hemorrhage (IVH) in the lateral ventricles, the 3^rd ventricle, and the 4^th ventricle. Compared with the IVH, the subdural hemorrhage (SDH) in the infratentorial space and tentorial incisura (white arrows), and the hematoma in the suprapineal recessus (white dotted arrow) are barely visible. (b) Mid-sagittal views. The quadrigeminal cistern in the tentorial incisura (white arrows) is seem to be connected to the IVH in the third ventricle via the suprapineal recessus (white dotted arrow)

Magnetic resonance (MR) images on day 18 after birth. (a) Axial and (b) sagittal views of T1-weighted images show marked enlargement of the ventricular system. The infratentorial SDH persists (white arrows), while most of the IVH is resolved. (c) Sagittal heavily T2-weighted images show an enlarged suprapineal recessus (white dotted arrow), which appears to extend into the infratentorial SDH (white arrows). Internal cerebral veins (ICVs) are depicted as a linear signal void at the roof of the third ventricle and the suprapineal recessus (white arrow heads)