Peritoneal Spaces Explained (How Fluid Spreads on CT) | Radiology Anatomy

Understanding the peritoneal spaces is essential for interpreting abdominal imaging and predicting how fluid and disease spread. In this lecture, I break down the peritoneal cavity into its key compartments and spaces, with a focus on clinical application. You’ll learn: The divisions of the peritoneal cavity (greater and lesser sacs) The key peritoneal spaces and recesses How fluid spreads within the peritoneal cavity The relationship between peritoneal anatomy and surrounding organs A practical framework for interpreting peritoneal pathology on imaging This talk, “Peritoneal spaces”, was presented at Radiopaedia 2025. 📅 I’m releasing one anatomy lecture per week in the lead-up to Radiopaedia 2026. Radiopaedia 2026 features 10 new anatomy talks, alongside hundreds of lectures from global experts. 👉 Don’t miss the world’s largest virtual radiology conference: https://radiopaedia.org/courses/radio...