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A 79-year-old man with persistent eosinophilia and elevated immunoglobulin E.

Joel P Brooks1, Kaoru Harada1, Nicole K Le1

  • 1From the Department of Internal Medicine, Yale School of Medicine/Yale-New Haven Hospital, New Haven, Connecticut.

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Eosinophilia can stem from various conditions. This case shows how targeted testing is crucial for diagnosing rare causes of persistent eosinophilia and elevated immunoglobulin E.

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Area of Science:

  • Immunology
  • Hematology
  • Internal Medicine

Background:

  • Eosinophilia, an increase in eosinophils, has a broad differential diagnosis.
  • Common causes include allergic reactions, infections, autoimmune disorders, and malignancies.
  • Elevated immunoglobulin E (IgE) can be associated with allergic and other conditions.

Observation:

  • A 79-year-old male presented with persistent eosinophilia and elevated IgE.
  • Initial treatments for presumed environmental exposures did not resolve the condition.
  • The patient underwent further specialized diagnostic testing.

Findings:

  • Sequential and targeted investigations were essential for identifying the underlying cause.
  • The case underscores the diagnostic challenges posed by rare etiologies of eosinophilia.
  • Specific diagnostic pathways are critical when common causes are excluded.

Implications:

  • This case emphasizes the need for a systematic approach in evaluating persistent eosinophilia.
  • It highlights the importance of considering rare diagnoses beyond typical differentials.
  • Clinicians should consider advanced diagnostic strategies for refractory eosinophilia and elevated IgE.