Abstract
A 60-year-old woman with constipation and a sensation of inadequate defecation visited a local doctor. Because barium enema showed the presence of a 75-mm fecal mass in the rectum, she was referred to our hospital. She had undergone a operation for an anal fistula about 35 years previously. Plain abdominal radiography revealed an enormous high-density mass in the rectum. Endoscopy of the large intestine also revealed a huge fecal mass within the rectum. A hard calculus was detected in the center of the fecal mass. With holmium: yttrium-aluminum-garnet (Ho:YAG) laser endoscopy, the calculus was bored and partially disintegrated. Finally, the calculus was completely crushed using chalazion forceps and removed through the anus. The intestinal calculus was composed of ammonium magnesium phosphate. Herein, we report on this rare case of an ammonium magnesium phosphate enterolith.
