Dioctophyme renale is a roundworm found in dogs, minks and other mammals. It rarely may infect humans, usually affecting the kidneys or urinary tract.


Synonynm: giant kidney worm


Larvae encyst in fish and amphibians. A human may become infected after eating a raw or undercooked host.


Dioctophyme renale may present as:

(1) worms and/or eggs in the urine

(2) cutaneous larva migrans

(3) hyperdense, hemorrhagic renal cyst

(4) renal pseudotumor

(5) retroperitoneal pseudotumor


The eggs are yellowish brown and measure 70 x 45 microns. They show a birefringent double-wall (“rings”) and equally spaced radial striations.


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