A fecaloma (meaning a tumor mae of feces, also called fecalith and coprolith, i.e., stones made of feces) is a hardening of feces into stones of varying size inside the colon, which may appear whenever chronic obstruction of transit occurs, such as in megacolon and chronic constipation. Some diseases, such as Chagas disease, Hirschsprung's disease and others provoke the destruction of the autonomic nervous system inside the colon's mucosa (Auerbach's plexus) and may cause extremely large (giant) fecalomas, which must be surgically removed (disimpaction). Normally, however, fecalomas can be manually disimpacted or by passing colonic tubes (catheters which carry a flow of disimpaction fluid (solvent).