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Colonic pseudo-obstruction
Functional obstruction of the colon leading to megacolon in the absence of obvious colonic diseases or mechanical obstruction. When this condition is acquired, acute, and coexisting with another medical condition (trauma, surgery, serious injuries or illness, or medication), it is called Ogilvie's syndrome. [from MONDO]
Constipation
Infrequent or difficult evacuation of feces. [from HPO]
Hypoganglionosis
Sparse and small myenteric ganglia [from HPO]
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