Fecal impaction
Fecaloma

A fecaloma can develop as the fecal matter gradually stagnates and accumulates in the intestine and increases in volume until the intestine becomes deformed. It may occur in chronic obstruction of stool transit, as in megacolon and chronic constipation. Some diseases, such as Chagas disease, Hirschsprung's disease and others damage the autonomic nervous system in the colon's mucosa (Auerbach's plexus) and may cause extremely large or "giant" fecalomas, which must be surgically removed (disimpaction). Rarely, a fecalith will form around a hairball (Trichobezoar), or other absorbent or desiccant core.
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