In an 80-year-old man with new unilateral lower‑thoracic chest pain for 7 days followed by erythema over the same area 3 days later and no comorbidities, what are the differential diagnoses other than atypical herpes zoster?

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Differential Diagnosis for Unilateral Lower Thoracic Chest Pain with Delayed Erythema

The most likely alternative diagnosis to consider is Mondor's disease (superficial thrombophlebitis of the chest wall veins), followed by musculoskeletal causes, though the clinical presentation strongly suggests herpes zoster even if appearing atypical.

Primary Differential Considerations

Mondor's Disease

This is a rare but important consideration given the unilateral distribution and erythema. Mondor's disease presents as superficial sclerosing thrombophlebitis of chest wall veins, causing localized pain and visible cord-like swelling or erythema 1. The condition is self-limiting and can present with acute-onset unilateral chest pain with localized swelling, matching key features of this case. On examination, look for a palpable cord-like structure along the affected vein, which distinguishes it from other causes.

Musculoskeletal Pain

Musculoskeletal chest pain is the most common cause of chest pain in ambulatory settings 2. However, the delayed appearance of erythema 4 days after pain onset makes pure musculoskeletal etiology less likely. Look for:

  • Reproducible pain with palpation or movement
  • Absence of skin changes (which this patient has)
  • History of trauma or strain

Cutaneous Fungal Infection (Mucormycosis)

Though rare in non-immunocompromised patients, mucormycosis of the thoracic wall can present with chest pain and abscess formation 3. An 80-year-old patient with this exact presentation was reported, initially misdiagnosed as tuberculosis. Key features include:

  • Progressive subcutaneous abscess formation
  • May show epithelioid granuloma on biopsy
  • Consider if erythema progresses to nodules or ulceration 4

Clinical Reasoning Algorithm

Step 1: Examine the skin carefully

  • Look for vesicles or grouped lesions (even subtle ones) that would confirm zoster
  • Palpate for cord-like structures suggesting Mondor's disease
  • Assess for nodules, ulceration, or abscess formation suggesting fungal infection

Step 2: Assess pain characteristics

  • Dermatomal distribution strongly favors zoster, even without classic vesicles 4
  • Pain preceding rash by 24-72 hours (or longer) is typical for herpes zoster 4
  • This patient's 4-day interval between pain and erythema fits zoster's timeline

Step 3: Consider age-related factors At 80 years old, this patient has significant age-related immunosenescence. Herpes zoster can present with nonspecific lesions that do not initially have vesicular appearance, particularly in elderly patients 4. The guideline explicitly states that "some patients may present with nonspecific lesions that do not initially have the vesicular appearance of varicella" 4.

Critical Pitfalls to Avoid

  1. Don't dismiss atypical zoster too quickly: The absence of classic vesicles doesn't exclude zoster in elderly patients. Early lesions are erythematous macules that evolve over time 4.

  2. Don't delay antiviral therapy if zoster is suspected: Even with atypical presentation, empiric treatment should be considered given the patient's age and risk of complications including postherpetic neuralgia.

  3. Perform skin biopsy if diagnosis remains unclear: This is essential for identifying fungal infections that can mimic other conditions 4.

Other Considerations (Lower Priority)

  • Rib fracture: Unlikely without trauma history
  • Sarcoidosis: Possible but would typically have systemic symptoms 5
  • Tietze syndrome: Affects costochondral junctions, not dermatomal distribution 2
  • Pleuritic causes: Would have respiratory symptoms

The key distinguishing feature is the dermatomal distribution and temporal relationship between pain and skin findings, which remains most consistent with herpes zoster despite atypical appearance 4. If vesicles develop over the next 24-48 hours, this confirms the diagnosis. If the erythema forms a palpable cord, consider Mondor's disease. If it progresses to nodules or ulceration, urgent biopsy is needed to exclude fungal infection.

References

2
Research

[Chest pain].

Therapeutische Umschau. Revue therapeutique, 2015

3
Research

[A case of mucormycosis of the thoracic wall in a non-immunocompromised man].

Nihon Kokyuki Gakkai zasshi = the journal of the Japanese Respiratory Society, 2010

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