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T crassicuada, the rat (R norvegicus) urinary bladder nematode can be found in the lumen as well as in the mucosal epithelium (black arrows). (HE stain, 10× magnification).
(Courtesy of D. R. Reavill, DVM, DABVP (Avian and Reptile & Amphibian Practice), DACVP, Carmichael, CA).
