preprints.org > biology and life sciences > parasitology > doi: 10.20944/preprints202401.0535.v1

Preprint Case Report Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 6 January 2024 / Approved: 8 January 2024 / Online: 8 January 2024 (11:27:18 CET)

Consumption of raw and mild processed seafood, in the context of modern western world eating trends, is recognized as a major driver for human fish-borne infections. However, these zoonoses and their unfamiliar risks remain neglected and underappreciated among European diagnosticians. In contemporary Europe anisakiosis is one of the most important fish-borne zoonoses. It is caused by ingesting nematode parasites of the family Anisakidae. The case described herein, is an intestinal and ectopic form of anisakiosis, causing symptoms of subacute abdomen and masquerading as an intraperitoneal malignancy. It is the first anisakiosis case reported in Greece, affecting a young patient who had been repeatedly exposed to the parasite by consuming homemade raw fish. Right hemicolectomy, omentectomy and excision of a descending colon nodule were uneventfully performed. The pathology report confirmed granulomatous tissue with eosinophilic infiltration and parasites that were morphologically and molecularly identified as Anisakis spp. Although challenging, obtaining an accurate diagnosis of anisakiosis can prevent unnecessary surgery. However, in rare cases, extra-gastrointestinal migration of larvae can cause severe damages with practically unknown risks, posing a diagnostic and therapeutic dilemma. In such clinical case scenario, surgical exploration can decisively contribute to a definitive diagnosis and early identification of intraabdominal complications necessitating surgical intervention.

Anisakis; anisakiasis; ectopic; intestinal anisakiasis; extra-gastrointestinal; foodborne; zoonotic; sushi; colectomy

Biology and Life Sciences, Parasitology

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