📌 Posterior Capsular Recess vs PCL Ganglion — Ultra Short Guide

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“The 10-second rule every radiologist should know.”

✅ More structured MSK MRI guidance is available in my book,
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📌 Posterior Capsular Recess vs PCL Ganglion — Ultra Short Guide 

1) Location (Start Here)

Recess: Posteromedial, behind the joint capsule, deep to the medial gastrocnemius
PCL Cyst: Intercondylar notch, around the PCL or between cruciate fibers

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2) Morphology

Recess: Flat crescent-shaped fluid, widely communicating with the joint
PCL Cyst: Rounded or multilobulated, well-defined discrete fluid mass

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3) Joint Communication (Most Important)

Recess: Clearly communicates with the joint space
PCL Cyst: No true communication; size independent of effusion

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4) Signal & Structure

Recess: Simple fluid signal, thin wall, no septations
PCL Cyst: T2 bright, internal septations common, possible wall thickening

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5) One-Line Differentiation

Recess → Posteromedial + joint-connected fluid
PCL Cyst → Intercondylar + PCL-attached mass

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