A 28-year-old man is brought after a high-speed road traffic accident. On FAST examination, an anechoic collection is seen in Morrison's pouch. Which anatomical space is being assessed by this probe position?
- A Hepatorenal (Morrison's) pouch — right paracolic gutter ✓
- B Right subphrenic space
- C Pouch of Douglas
- D Splenorenal recess
Correct answer: A. Hepatorenal (Morrison's) pouch — right paracolic gutter
Explanation
Morrison's pouch is the hepatorenal recess, the potential space between the liver and right kidney; it is the most dependent part of the peritoneal cavity in a supine patient and collects free fluid first. FAST uses four windows: subxiphoid (pericardium), right flank (Morrison's pouch), left flank (splenorenal recess), and suprapubic (pelvis). Anechoic fluid here indicates intraperitoneal hemorrhage and is a positive FAST. The subphrenic space lies above the liver, and Morrison's pouch is distinct from it.
Reference: Grainger & Allison's Diagnostic Radiology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.