Definition
Mucin-filled cyst arising from an adjacent joint capsule or tendon sheath and joined to it by a stalk. The wall has no true synovial lining.
Pathology
- Mucoid degeneration of capsular or tendon sheath connective tissue
- Wall of compressed collagen without an epithelial or synovial lining
- Thick clear fluid rich in hyaluronic acid
Epidemiology
- Most common soft tissue mass of the hand and wrist
- Women more often, in the second to fourth decades
Classification
- Dorsal wrist. 60 to 70%, arising from the scapholunate ligament
- Volar wrist. About 20%, from the radiocarpal or scaphotrapezial joint, beside the radial artery
- Flexor tendon sheath. Firm seed ganglion at the A1 or A2 pulley
- Mucous cyst. Dorsal DIP joint, with Heberden’s nodes and nail grooving
- Occult dorsal ganglion. Dorsal wrist pain without a palpable mass
- Intraosseous ganglion. Lytic carpal lesion, often in the lunate
Clinical Features
- Smooth firm mass that transilluminates
- Size fluctuates with activity
- Median or ulnar nerve compression from ganglia in the carpal tunnel or Guyon’s canal
Investigations
- Ultrasound confirms a cystic lesion and its stalk
- MRI for occult ganglia
- Radiographs to exclude arthritis or an intraosseous lesion
Differential Diagnosis
- Giant cell tumour of tendon sheath
- Lipoma
- Extensor tenosynovitis
- Carpal boss
- Radial artery aneurysm for volar wrist masses
Management
- Observation. About half resolve without treatment
- Aspiration. Recurrence above 50% at most sites, lower for flexor sheath ganglia
- Open excision. Recurrence about 5% when the stalk and a cuff of capsule are excised, see Ganglion Excision
- Arthroscopic excision. Option for dorsal wrist ganglia, resecting the stalk and adjacent capsule
- Mucous cyst excision. Combined with DIP joint osteophyte debridement to reduce recurrence
Complications
- Recurrence
- Radial artery injury during volar excision
- Wrist stiffness and scapholunate ligament injury
Reviewed by Professor Phong Tran, Head of Orthopaedic Surgery, Western Health. Last updated 19 October 2026.