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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Question 1MusculoskeletalMedium
A 28-year-old graphic designer presents with a lump on the back of her wrist that has been present for several months and fluctuates in size, becoming more prominent with repetitive typing. She reports a dull ache with wrist extension but denies trauma or constitutional symptoms. On examination there is a firm, smooth, rounded 2-cm mass on the dorsal wrist that grows more prominent with wrist flexion and feels attached to deeper structures. When a penlight is held against the mass, it transilluminates. Which of the following is the most likely diagnosis?
ATenosynovial giant cell tumor
BCarpal boss bony prominence
CDorsal wrist ganglion cyst
DDorsal subcutaneous lipoma
Reveal answer & full explanation
Correct answer: C — Dorsal wrist ganglion cyst
ATenosynovial giant cell tumor
BCarpal boss bony prominence
CDorsal wrist ganglion cyst✓
DDorsal subcutaneous lipoma
Why Dorsal wrist ganglion cyst is correct
It is the most common soft tissue mass of the hand and wrist, peaks in women aged 20 to 40, and classically arises from the dorsal wrist over the scapholunate ligament.
The constellation here is characteristic: a firm, smooth, rounded mass that fluctuates in size, aches with repetitive use, becomes more prominent with wrist flexion, and transilluminates with a penlight.
Transillumination is the bedside finding that separates a fluid-filled ganglion from a solid mass; diagnosis is clinical, with ultrasound or MRI reserved for small, occult, or atypical lesions.
Why the others are wrong
Carpal boss bony prominence — a hard, immobile osteoarthritic spur at the second or third carpometacarpal joint that is fixed in size and does not transilluminate, unlike this fluctuating, transilluminating mass.
Tenosynovial giant cell tumor — a firm, lobulated mass adjacent to a flexor tendon that does not transilluminate and shows hemosiderin signal on MRI.
Dorsal subcutaneous lipoma — a soft, mobile fat mass that is non-tender, does not transilluminate, and less commonly overlies a joint.
Question 2MusculoskeletalMedium
A 28-year-old woman presents with a 6-week history of a painless lump on the back of her wrist that she first noticed after taking up tennis. She reports the lump seems to change size and occasionally aches with vigorous wrist extension but does not limit her daily activities. On exam there is a firm, smooth, 1.5-cm rounded mass over the dorsal wrist that transilluminates with a penlight and is non-tender. Neurovascular exam of the hand is normal, and she is most worried that it might be cancer. Which of the following is the most appropriate initial management?
ANeedle aspiration and steroid injection
BReassurance and clinical observation
COpen surgical excision of the cyst
DWrist immobilization in a rigid cast
Reveal answer & full explanation
Correct answer: B — Reassurance and clinical observation
ANeedle aspiration and steroid injection
BReassurance and clinical observation✓
COpen surgical excision of the cyst
DWrist immobilization in a rigid cast
Why Reassurance and clinical observation is correct
The classic findings — a fluctuating, transilluminating dorsal wrist mass in a young woman — are diagnostic of a ganglion cyst, the most common soft tissue mass of the hand and wrist.
For a minimally symptomatic ganglion, first-line management is observation and reassurance; roughly half of cysts resolve spontaneously over months, and addressing her cancer fear is part of treatment.
Invasive treatment is reserved for cysts that are painful, functionally limiting, recurrent, or cosmetically bothersome — none of which apply here.
Why the others are wrong
Needle aspiration and steroid injection — a reasonable option for bothersome cysts, but it carries a 40-70 percent recurrence rate and is not first-line for a mass that is barely symptomatic.
Open surgical excision of the cyst — second-line therapy for symptomatic, recurrent, or cosmetically problematic cysts; too aggressive as an initial step and still recurs in 5-15 percent.
Wrist immobilization in a rigid cast — splinting can give symptomatic relief, but rigid casting is excessive, promotes stiffness, and does not treat the cyst.
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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.
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
Four common ganglion cyst presentations and their anatomic origins.
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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