Anisakiasis of the tonsils

Area of Science:

• Parasitology
• Human Pathology
• Infectious Diseases

Background:

• Chronic recurrent tonsillitis is a common pediatric condition often treated with tonsillectomy.
• Anisakis simplex is a nematode parasite typically found in marine fish, known to cause human anisakiasis through ingestion of raw or undercooked seafood.
• Human anisakiasis commonly affects the gastrointestinal tract, but ectopic presentations are occasionally reported.

Observation:

• A six-year-old Indian girl underwent tonsillectomy for symptoms consistent with chronic recurrent tonsillitis.
• Histopathological examination of the removed tonsil tissue revealed a cross-section of an Anisakis worm.
• The parasite was identified within the tonsillar tissue, not causing overt inflammatory changes suggestive of acute infection.

Findings:

• This case represents a novel anatomical location for Anisakis worm presence in a human host.
• The histopathological finding suggests a potential, albeit rare, route of parasitic migration or lodging in the tonsils.
• The absence of typical gastrointestinal symptoms in this patient broadens the clinical spectrum of Anisakis infections.

Implications:

• This finding expands the known anatomical distribution of Anisakis infections in humans.
• It suggests the need for considering parasitic etiologies in unexplained tonsillar pathologies, even without a clear history of seafood consumption.
• Further research may be warranted to understand the prevalence and mechanisms of such ectopic Anisakis infections.