anisakiasis
Anisakiosis is a parasitic infection that follows consumption of raw or insufficiently pickled, salted, smoked, or cooked wild marine fish infected with Anisakis sp. larvae.
Microscopical synopsis
localized area of serositis
mucosal edema
submucosal abscess rich in eosinophils surrounding a parasite consistent with the third larval stage of Anisakis sp.
Diagnostic morphologic of the parasite
unpaired excretory gland (renette cell)
Y-shaped lateral epidermal cords
no apparent reproductive system
a ventriculus (glandular esophagus)
absence of lateral alae excluded Ascaris sp.
absence of ventricular appendage and intestinal cecum excluded other anisakids of the genera Pseudoterranova and Contracaecum.
Differential diagnosis
acute abdominal syndromes
eosinophilic infiltrates of the stomach, small intestine, colon, omentum, and mesentery
References
Couture C, Measures L, Gagnon J, Desbiens C. Human intestinal anisakiosis due to consumption of raw salmon. Am J Surg Pathol. 2003 Aug;27(8):1167-72. PMID: 12883252