Abstract
A 68-year-old man underwent colonoscopy for a positive fecal occult blood test. A whipworm (Trichuris trichiura), which was seen to be moving gently in the cecum (A), was discovered during the examination. The whipworm was judged to be female because its caudal end was obtuse (A,black arrow). By use of a magnifying colonoscope (EC-590ZW/M, Fujinon, Saitama, Japan), we could identify some small eggs in the vicinity of vulva (B,yellow arrow), uterus (B,blue arrow), and intestine (B,red arrow). At the esophageal part, there were round cells called stichocytes that were regularly beaded into an arrangement (C) called a stichosome.
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