Case 1

53 year old man with pain in his left shoulder after a skiing accident-he has particular difficulty lifting objects up from in front of him.

This is a proton density image (PD). That means that water (like joint fluid, in this case) is medium grey rather then white (like T2) or dark (like T1). Fat is bright so there is no fat suppression.

Key to color labels:

dark green - clavicle

light green - scapula

lavender - humerus

aqua - supraspinatus muscle and ruptured tendon

red - infraspinatus tendon, also ruptured

yellow - joint effusion

dark blue - long head of biceps tendon

orange, dark orange and blue - posterior humeral circumflex artery, vein and axillary nerve

pink - subscapularis muscle

purple - short head of biceps tendon