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Dirofilariasis, a rare, usually imported dermatosis
1Department of Dermatology, Association Hospitalière Etterbeek-Ixelles, Brussels, Belgium.
Dermatology (Basel, Switzerland)
|January 1, 1996
Summary
Dirofilariasis is a rare zoonotic filariasis transmitted from animals to humans. Infected individuals typically develop subcutaneous nodules containing immature worms, often misdiagnosed as lipomas or cysts.
Area of Science:
- Veterinary Parasitology
- Human Infectious Diseases
- Zoonotic Infections
Background:
- Dirofilariasis is a parasitic disease primarily affecting animals, caused by filarial worms of the genus *Dirofilaria*.
- Human infections (dirofilariasis) are rare zoonotic events, typically resulting from the accidental transmission of infective larvae from animal reservoirs.
- Understanding the transmission dynamics and clinical presentation in humans is crucial for accurate diagnosis and management.
Observation:
- Clinical manifestations in humans commonly present as solitary or few subcutaneous nodules.
- These nodules are frequently misdiagnosed as benign skin tumors such as lipomas or epidermoid cysts.
- Histopathological examination of excised nodules often reveals an adult but immature filarial worm.
Findings:
- The parasitic worm found within the nodule is typically an adult, yet immature, filarial worm.
- Human dirofilariasis does not elicit systemic reactions or significant inflammatory responses.
- The causative agent is a filarial nematode, transmitted exceptionally to humans.
Implications:
- Surgical excision of the subcutaneous nodule is the definitive and sole treatment required for human dirofilariasis.
- Increased awareness among clinicians can improve the diagnostic accuracy of subcutaneous nodules, reducing misdiagnosis.
- Further research into zoonotic transmission patterns may aid in preventing human exposure to *Dirofilaria* species.