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.
Synopsis
acute intestinal obstruction
multiple small bowel stenosis
acute inflammatory ileitis simulating appendicitis
ulcer type epigastralgia
purulent peritonitis
latent small bowel tumor
positive serodiagnosis
consumption of undercooked fishes
Microscopical synopsis
eosinophilic granulomas
parasitic fragments
intestinal eosinophilic granuloma
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 sp. and Contracaecum sp. .
Localization
gastric anisakiasis
Differential diagnosis
acute abdominal syndromes
eosinophilic infiltrates of the stomach, small intestine, colon, omentum, and mesentery
References
Chronic gastric anisakiasis presenting as pneumoperitoneum. Ito Y, Ikematsu Y, Yuzawa H, Nishiwaki Y, Kida H, Waki S, Uchimura M, Ozawa T, Iwaoka T, Kanematsu T. Asian J Surg. 2007 Jan;30(1):67-71. PMID: #17337375#
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#