Define Ganglion. Describe its clinical features and management.

The Concept

A ganglion is a cystic swelling arising from a joint capsule or a tendon sheath, containing clear, gelatinous, mucoid fluid. It is one of the commonest soft-tissue swellings, and its typical and diagnostic location is the dorsum of the wrist (also the volar wrist, dorsum of the foot and around the fingers). Its connection to the underlying synovial structure is central to its identity.

Clinical Features

A ganglion is a smooth, well-defined, rounded swelling that is often tense (and may therefore feel firm or even hard rather than obviously cystic); because it contains clear fluid it may transilluminate. It is usually painless (though it can ache), and is characteristically tethered to the deeper joint or tendon sheath from which it arises (so it moves little, and may become more prominent on flexing the joint).

Management

Because many ganglia are harmless and some resolve spontaneously, simple reassurance is often sufficient. Symptomatic ganglia can be treated by aspiration (though recurrence is common) or surgical excision; even after excision, recurrence can occur if the connection to the joint/sheath is not fully dealt with. (The old remedy of striking it with a heavy book is no longer recommended.)

A Note on the Compound Palmar Ganglion

A specific variant worth knowing is the compound palmar ganglion — a swelling of the common flexor tendon sheath at the wrist, crossing the flexor retinaculum so that it bulges both above and below it, sometimes with a 'cross-fluctuation' sign (pressure on one part transmits to the other). It is classically associated with tuberculous tenosynovitis and may contain fibrin bodies ('melon-seed bodies'). This links the everyday ganglion to an important infective cause.

The Bottom Line

A ganglion is a mucoid-filled cystic swelling from a joint capsule or tendon sheath, commonest at the dorsum of the wrist, often resolving spontaneously but treated by excision if symptomatic.

A Note on Transillumination & Consistency

A point that often causes confusion is that a ganglion, despite being a fluid-filled cyst, is frequently so tense that it feels firm or even bony-hard rather than obviously cystic, and fluctuation can be difficult to elicit. Its clear mucoid contents do allow transillumination, and its fixed relationship to the underlying joint or tendon sheath — becoming tenser when the joint is put into certain positions — helps confirm the diagnosis. Appreciating this prevents a tense ganglion being mistaken for a solid tumour.

Becomes more prominent on flexing the wrist.

• Ganglion = cystic swelling from a joint capsule or tendon sheath containing clear gelatinous/mucoid fluid; commonest on the dorsum of the wrist.
• Smooth, well-defined, often tense (may feel firm/hard), may transilluminate, usually painless, tethered to the deeper joint/sheath.
• Many resolve spontaneously → reassurance; aspiration (recurs) or surgical excision if symptomatic (recurrence possible).