What is the likely diagnosis and appropriate management for a swollen, hard tendon in the mid‑palm that makes it difficult to make a fist?

Swollen Tendon in Mid-Palm with Difficulty Making a Fist

This presentation most likely represents flexor tenosynovitis, and you should immediately obtain plain radiographs followed by ultrasound or MRI to differentiate between infectious, inflammatory, or tuberculous causes—particularly if the patient is from an endemic region or immunocompromised.

Differential Diagnosis Priority

The clinical picture of a swollen, hard tendon in the mid-palm with restricted fist formation points to several key diagnoses:

Most Likely: Flexor Tenosynovitis

• Tuberculous tenosynovitis (compound palmar ganglion) should be your top consideration if the swelling is chronic (>3 months), painless or minimally painful, and progressively enlarging 1, 2, 3
• This is frequently misdiagnosed as rheumatoid arthritis or simple ganglion cysts due to its insidious onset
• Particularly suspect this in patients from TB-endemic regions or those who are immunocompromised (HIV-positive, chronic steroid use) 2

Alternative Diagnoses:

• Trigger finger/stenosing tenosynovitis 4
• Flexor tendon rupture (though typically presents with sudden loss of function rather than swelling) 5
• Non-specific inflammatory tenosynovitis 4

Diagnostic Approach

Step 1: Clinical Examination

Look for these specific findings:

• Palpable "spongy" or firm swelling along the flexor tendon sheath, often extending from wrist to palm 1, 3
• Loss of active flexion at specific digits (test each finger's DIP and PIP joint independently)
• Absence of pain or minimal tenderness (suggests chronic process rather than acute infection)
• No systemic symptoms (fever, weight loss) in most cases of tuberculous tenosynovitis 1
• Assess for "rice bodies" - these may occasionally be palpable as small nodules along the tendon sheath

Step 2: Imaging Algorithm

First-line: Plain radiographs of the hand and wrist 6

• Rule out fracture fragments, calcifications, or bony abnormalities
• May show soft tissue swelling but typically non-diagnostic for tendon pathology

Second-line: MRI without IV contrast 7, 1

• This is your definitive imaging study
• Look specifically for:
  • "Rice bodies" within the flexor tendon sheath (pathognomonic for tuberculous tenosynovitis) 1, 2
  • Flexor tendon thickening and synovial proliferation 2
  • Extent of involvement (single vs. multiple compartments)
• MRI changed clinical management in 69.5% of hand/wrist cases in one surgical series 7

Alternative: Ultrasound 7

• Can identify tenosynovitis, tendinopathy, and synovial proliferation
• Operator-dependent but useful if MRI unavailable
• Contributory to clinical assessment in 76% of hand cases 7

Management Algorithm

If Imaging Suggests Tuberculous Tenosynovitis:

Surgical excision is mandatory 1, 2, 3

• Open surgical exploration and complete excision of the mass
• Send tissue for:
  • Histopathology (look for caseating granulomas and Langhans giant cells)
  • Ziehl-Neelsen staining (acid-fast bacilli)
  • Culture (though often negative)

Post-operative management:

• Start 12-month course of anti-tubercular therapy (ATT) immediately after histopathological confirmation 1, 2
• Standard first-line four-drug regimen (rifampin, isoniazid, pyrazinamide, ethambutol for 2 months, then rifampin and isoniazid for 10 months)
• Early hand therapy and mobilization to prevent adhesions

If Non-Tuberculous Tenosynovitis:

Conservative management first 8:

• Relative rest - avoid repetitive gripping and forceful flexion
• Ice therapy - 10-minute applications through wet towel 8
• NSAIDs for short-term pain relief (topical or systemic) 8
• Splinting in position of function for 2-3 weeks

If conservative fails after 3-6 months:

• Consider corticosteroid injection (use with caution in flexor tendons due to rupture risk) 8
• Surgical release if persistent symptoms 8

Critical Pitfalls to Avoid

1. Do not dismiss chronic, painless swelling as a simple ganglion cyst - tuberculous tenosynovitis can persist for years and cause permanent flexor dysfunction if untreated 1

2. Do not inject corticosteroids blindly - if tuberculous etiology is possible, steroid injection will worsen the condition and delay diagnosis 8

3. Do not rely on systemic TB symptoms - most patients with tuberculous tenosynovitis have NO pulmonary symptoms or constitutional signs 1, 2

4. Do not skip histopathology - clinical and imaging findings alone cannot definitively distinguish tuberculous from other chronic inflammatory conditions 2

5. In acute presentations with severe pain, erythema, and fever - consider pyogenic flexor tenosynovitis (surgical emergency requiring urgent irrigation and debridement)

Expected Outcomes

• Tuberculous tenosynovitis: Full functional recovery expected with combined surgical excision and 12-month ATT, with no recurrence 1, 2
• Non-specific tendinopathy: 80% fully recover within 3-6 months with conservative management 8
• Delayed diagnosis consequences: Tendon rupture, permanent loss of flexion, and chronic hand dysfunction 1