Ganglion Cyst
Benign mucinous cyst arising from a joint capsule or tendon sheath, most often on the dorsal wrist.
Also known as: ganglion, wrist ganglion, dorsal wrist cyst, Bible cyst
Overview
A benign, fluid-filled cyst originating from a joint capsule or tendon sheath and containing thick mucinous fluid rich in hyaluronic acid. The dorsal wrist (scapholunate ligament) is the most common location, followed by the volar wrist and the flexor tendon sheath at the A1 pulley (retinacular cyst).
Epidemiology
The most common soft tissue mass of the hand and wrist. Peaks between ages 20-40, with a 3:1 female-to-male predominance.
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Risk factors
- Repetitive wrist motion or overuse
- Prior wrist trauma or sprain
- Underlying osteoarthritis (mucous cysts at the DIP joint)
- Female sex, young adulthood
Pathophysiology
Believed to arise from mucoid degeneration of joint capsule or tendon sheath collagen, producing a one-way valve through which synovial fluid escapes and accumulates within a pseudocapsule lacking a true epithelial lining. Mucous cysts overlying distal interphalangeal joints are associated with underlying osteoarthritis and adjacent osteophytes.
Clinical presentation
Symptoms
- Visible or palpable mass that often fluctuates in size
- Aching pain with wrist extension or repetitive activity
- Occult dorsal ganglion may cause wrist pain without a palpable mass
- Nail deformity or grooving if a mucous cyst compresses the germinal matrix
Signs / physical exam
- Firm, smooth, rounded mass, typically 1-3 cm
- Transilluminates with a penlight (classic teaching point)
- Non-tender unless compressing an adjacent nerve
- Tinel sign if compressing the median or ulnar nerve at the wrist
Classic findings
Dorsal wrist swelling that increases with wrist flexion, transilluminates, and is firmly attached to deeper structures.
Differential diagnosis
- Lipoma — Soft, mobile, non-transilluminating subcutaneous mass; less commonly overlies joints
- Giant cell tumor of the tendon sheath — Firm, lobulated mass adjacent to flexor tendon; does not transilluminate; MRI shows characteristic hemosiderin signal
- Epidermal inclusion cyst — Round subcutaneous nodule with central punctum; common on volar fingertip
- Carpal boss — Bony prominence at base of second or third metacarpal; rigid, non-cystic, transillumination negative
- Synovial sarcoma — Rare; deep, progressively enlarging mass; needs MRI and biopsy; suspect if size >5 cm or growth
- Mucous cyst (DIP) — Small translucent cyst over distal interphalangeal joint associated with underlying Heberden node and OA
Diagnostic workup
Labs
- None required for the typical ganglion cyst
Imaging
- Clinical diagnosis in most cases
- Ultrasound to confirm cystic structure when the mass is small, occult, or atypical
- MRI for occult dorsal ganglion suspected as a source of wrist pain or to exclude solid tumor when features are atypical
- Plain radiographs for DIP mucous cysts to evaluate for osteophytes and concurrent OA
Diagnostic algorithm
| Type | Location | Origin | Notable Feature |
|---|---|---|---|
| Dorsal wrist | Over scapholunate ligament | Scapholunate joint capsule | Most common; bulges with wrist flexion |
| Volar wrist | Radial volar wrist | Radiocarpal or scaphotrapezial joint | Proximity to radial artery |
| Flexor tendon sheath (retinacular) | Base of finger over A1 pulley | Flexor tendon sheath | Small, firm, tender with gripping |
| Mucous cyst | Dorsal DIP joint | Osteoarthritic DIP joint | Associated osteophytes; may dystrophy nail |
Treatment
First-line
- Observation and reassurance — many cysts resolve spontaneously within months
- Activity modification to reduce repetitive wrist strain
- Splinting for symptomatic relief
- Aspiration with an 18-gauge needle, with or without corticosteroid injection (triamcinolone or methylprednisolone); recurrence rate 40-70 percent
Second-line / adjunct
- Surgical excision (open or arthroscopic) for symptomatic, recurrent, or cosmetically bothersome cysts — recurrence after surgery 5-15 percent
- Avoid the traditional Bible thump — historically described, no longer recommended due to risk of soft tissue and tendon injury
Complications
- Recurrence after aspiration or surgical excision
- Median or ulnar nerve compression with paresthesias (volar wrist ganglion)
- Nail dystrophy from mucous cyst pressure on the germinal matrix
- Rare infection or hematoma after aspiration or excision
PANCE pearls
- Transillumination is the bedside finding that distinguishes a ganglion from a solid soft tissue mass.
- Spontaneous resolution occurs in roughly 50 percent of pediatric ganglia and a substantial minority of adult cases — observation is reasonable first-line.
- Mucous cysts of the DIP joint are associated with underlying osteoarthritis; treating the cyst without addressing the osteophyte invites recurrence.
- A volar wrist ganglion overlying the radial artery should be aspirated only with caution or referred for surgical management.
References
- AAOS — American Academy of Orthopaedic Surgeons patient and clinician guidance on ganglion cysts of the wrist and hand
- ASSH — American Society for Surgery of the Hand clinical resources on ganglion cysts
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