Journal of medical primatology · 2026
The First Evidence of Intermittent Rectal Prolapse in a Wild Chimpanzee (Pan troglodytes).
СтатьяКлинический случайНазвание и аннотация: Перевод в очереди
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Shimada Masaki, Yano Wataru
Аннотация
BACKGROUND: Rectal prolapse in wild chimpanzees has been rarely reported. We document a case of rectal prolapse in a wild young male chimpanzee at Mahale Mountains National Park, Tanzania.
METHODS: An affected young male in the Mahale M group was observed with photographs/video and diagnosed according to operational criteria used in human (Oxford grading system). Cause and course of the prolapse were estimated by a set of longitudinal field data.
RESULTS: An intermittently self-reducing full-thickness rectal prolapse was diagnosed. Protrusion fluctuated within minutes; tenesmus and diarrhea were absent; and the mucosa remained bright red and viable, without necrosis or myiasis. Post-traumatic pelvic-floor/anal-sphincter nerve dysfunction after conspecific bite injury on the buttock was estimated as the cause.
CONCLUSIONS: This is the first report of rectal prolapse in wild chimpanzees. The detailed natural course of this persistent condition without medical intervention provides information relevant to case-specific management decisions in wild apes.
METHODS: An affected young male in the Mahale M group was observed with photographs/video and diagnosed according to operational criteria used in human (Oxford grading system). Cause and course of the prolapse were estimated by a set of longitudinal field data.
RESULTS: An intermittently self-reducing full-thickness rectal prolapse was diagnosed. Protrusion fluctuated within minutes; tenesmus and diarrhea were absent; and the mucosa remained bright red and viable, without necrosis or myiasis. Post-traumatic pelvic-floor/anal-sphincter nerve dysfunction after conspecific bite injury on the buttock was estimated as the cause.
CONCLUSIONS: This is the first report of rectal prolapse in wild chimpanzees. The detailed natural course of this persistent condition without medical intervention provides information relevant to case-specific management decisions in wild apes.