SN6 SHORT NOTE 5M

Define Ganglion. Describe its clinical features and management.

General Surgery · Final Professional

Definition

A ganglion is a benign cystic swelling arising from a joint capsule or tendon sheath, filled with a clear, viscous, gelatinous (mucin-like) fluid. It is the commonest soft-tissue swelling of the hand and wrist, most often on the dorsum of the wrist.

Clinical Features

A smooth, rounded, well-defined swelling, usually painless (occasionally aching), that may fluctuate in size. It is firm and characteristically transilluminates (because it is fluid-filled) — a useful bedside sign. Common sites are the dorsal and volar wrist and the flexor tendon sheath of a finger. It is usually of cosmetic concern or causes mild discomfort.

CLINICAL PEARL

A cystic wrist swelling that transilluminates and is attached to a joint/tendon sheath is almost certainly a ganglion — the transillumination distinguishes a fluid-filled cyst from a solid tumour.

Management

Many ganglia are harmless and resolve spontaneously, so reassurance and observation is appropriate for an asymptomatic lesion. Symptomatic ones may be treated by aspiration (± steroid, though recurrence is common) or, for persistent/recurrent or troublesome ganglia, surgical excision (removing the root/stalk to reduce recurrence). The old ‘hitting it with a book’ remedy is not recommended.

Clinical Note

Although the classic teaching is that a ganglion transilluminates and is harmless, an atypical, firm or rapidly enlarging swelling should not be assumed to be a ganglion, and imaging (ultrasound or MRI) is used where the diagnosis is in doubt to exclude other soft-tissue lesions. When a ganglion is excised, removing its stalk and a cuff of the underlying capsule reduces the significant recurrence rate that follows simple aspiration.

CLINICAL PEARL

The bedside clincher is transillumination: a soft, well-defined wrist swelling that glows when a light is held to it is a fluid-filled ganglion rather than a solid tumour.

DANGER / REMEMBER

An important trap is the volar wrist ganglion, which lies close to the radial artery: aspiration or surgery in this location carries a risk of vascular injury, so these are approached with particular care, and Allen’s test and imaging are used to define the anatomy before any intervention.

Becomes more prominent on wrist flexion.

KEY POINT

Key points TO remember

Benign cyst from a joint capsule/tendon sheath with gelatinous fluid; commonest hand/wrist swelling.
Smooth, well-defined, usually painless, transilluminates; often dorsal wrist.
Many resolve spontaneously → reassure/observe.
Aspiration (recurs) or surgical excision (remove stalk) for symptomatic/recurrent lesions.

EXAM TIP

Sources: Maheshwari's Essential Orthopaedics; Apley & Solomon's System of Orthopaedics and Trauma; AO Principles of Fracture Management.

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