Unilateral Hypoplasia of the Rostral End of the Superior Sagittal Sinus

Abstract

BACKGROUND AND PURPOSE:Hypoplasia of the rostral third of the SSS is a well-known variant and constitutes the most frequent variation of the SSS after preferential drainage to one of the transverse sinuses. Our aim was to describe unilateral hypoplasia of the rostral end of the SSS.

MR imaging of the yucatan pig head and neck vasculature

“…This is homologous to the epidural plexus in humans, however, in the supine position, the dominant outflow in the human is most commonly through the IJVs and in the upright position through the paraspinal network (). In humans, the anterior condylar confluent allows for the redirection of blood flow between these vessels (); however, this structure was not clearly noted in the vasculature of the pig. Anastomoses of varying diameter were observed between the IJV, external jugular veins (EJV), and VVVP in all three pigs.…”

Whole-Brain Computed Tomographic Perfusion Imaging in Acute Cerebral Venous Sinus Thrombosis

“…Anatomical variations of dural venous sinuses are frequently encountered in clinical practice, at times making it challenging to differentiate between a physiologically hypoplastic or absent sinus and incidental arachnoid granulations versus acute sinus occlusion from thrombosis [18,19,20,21]. Digital subtraction angiography can sometimes help establish the correct diagnosis by demonstrating dynamics of venous blood return, but this test is invasive and can also be inconclusive.…”

Total Agenesis of Superior Sagittal Sinus and Falx Cerebri in a Patient Who Has a Subacute Subdural Hematoma Crossing Midline

“…Although segmental abnormalities are more frequent, all segments may be involved in rare occasions. 1,2 Anatomic variations of the SSS described in the literature are duplication (segmental or complete), hypoplasia (unilateral or complete), and atresia (segmental). [2][3][4][5] However, total or segmental agenesis of the SSS has not been described previously.…”

“…Additionally, absence or other anatomical variations of such a large dural venous sinus might affect the intracranial venous drainage pathways in different ways, especially leading to the development of variant drainage patterns to compensate drainage of the brain structures properly. [2][3][4][5]12 Venous drainage affected on account of the absence of the SSS can be compensated by some other enlarged venous structures situated around the region of the SSS. In our case, those are the tentorial sinus, frontal hemispheric veins, and parasagittal large venous channels.…”

“…1 Anatomic abnormalities of the superior sagittal sinus (SSS) are uncommon and mostly include duplication of the rostral SSS, unilateral hypoplastic rostral SSS, complete hypoplastic rostral SSS, hypoplastic dorsal SSS, and atresia of the rostral SSS. [2][3][4][5] However, agenesis of the SSS is such a rare abnormality that we were unable to find any reference in the English literature.…”