Ganglion Cyst

Clinical History: 
22 yr old woman with injury to her wrist one month ago. She noticed mild right wrist pain and swelling the day after the injury. She had pain with movement of her fingers. Recent X-rays were negative.

Diagnosis:
Focal cystic lesion around the extensor pollicis longus tendon with septation is suggestive of a large ganglion cyst.

MR Technique: 
3 T scanner (Siemens Verio) using wrist coil. Image 1: Axial proton density (TR/TE 3000/40 ms, scan time 2 min 59 secs, slice thickness 3 mm); Image 2: Axial T2 with fat saturation (TR/TE 4000/71 ms, scan time 4 min 2 secs, slice thickness 3 mm.)

Imaging Findings:
The tendons are normally located and appear normal in morphology and signal without evidence of tendonitis. No fluid is visualized in the tendon sheaths to suggest tenosynovitis. A focal fluid collection is noted around the extensor pollicis longus tendon at the level of proximal carpal row measuring approximately 0.7 x 1.0 x 1.7 cm. A septation is noted within this fluid collection. This lesion completely surrounds the extensor pollicis longus tendon.