Space
Transverse pericardial sinus
A pericardial passage behind the arterial roots
High-yield
Behind the arterial roots and in front of the superior caval region on the right: these relations distinguish the transverse sinus.
Overview
The transverse sinus passes behind the ascending aorta and pulmonary trunk, above and in front of the atrial surfaces. It separates the arterial from the venous reflections and opens into the wider pericardial space at both sides. Its shape is curved rather than a straight cylindrical tunnel.
Reference facts
- Boundaries
- Arterial roots anteriorly, atrial surfaces below and behind, and the superior caval region toward the right posterior side
- Contents
- Normally a small amount of pericardial fluid
- Communications
- Opens at right and left into the general pericardial cavity, with adjoining aortic and pulmonary recesses
Clinical correlation
Fluid in its recesses can resemble another structure on cross-sectional imaging. Understanding the continuous pericardial space helps distinguish a recess from a separate mediastinal lesion.
Frequently asked questions
What are the boundaries of the transverse pericardial sinus?
Arterial roots anteriorly, atrial surfaces below and behind, and the superior caval region toward the right posterior side.
What does the transverse pericardial sinus contain?
The transverse pericardial sinus contains the normally a small amount of pericardial fluid.
What does the transverse pericardial sinus communicate with?
The transverse pericardial sinus communicates with the opens at right and left into the general pericardial cavity, with adjoining aortic and pulmonary recesses.