Cestode infections are considered uncommon in commercial laying hens maintained in elevated cages because contact with soil, litter, and potential intermediate host is reduced. This case describes naturally occuring Raillietina tetragona infection in a commercial flock of approximately 25,000 Lohmann White hens, 100 hens, 100 weeks of age, maintained in elevated cages in Tepatitlán, Jalisco, México. Affected birds exhibited emaciation and diarrhea. Postmortem examination identified thinning of the intestinal wall, mucosal hemorrhages, and cestodes throughout the small intestine. Morphological examination of recovered cestodes supported identification as R. tetragona; recorded features included an approximately 18-cm flattened strobila, an armed rostellum, four ovoid armed suckers, and reproductive structures in mature and gravid proglottids. Histopathological examination of the duodenum showed disruption of mucosal architecture, partial villous atrophy and destruction, epithelial and mucosal necrosis, glandular hypertrophy and luminal enlargement, and inflitration by plasma cells, lymphocytes, and eosinophils. The findings describe a clinically relevant intestinal challenge in a cage-production setting. They also support the incomplete biological exclusion. Because enviromenmental transmission routes and functional resilience were not measured, these concepts are discussed as epidemiological and interpretive frameworks rather demonstrated outcomes.