Long fish tapeworm in the intestine: an in situ observation by capsule endoscopy.

We present the case of a patient who was referred to our hospital after she reported having passed a long, whitish object per rectum. Accordingly, capsule endoscopy was performed using the PillCam(®) SB video capsule. A tapeworm of the species Diphyllobothrium nihonkaiense was detected; it appeared to be freely floating and unfolded in the jejunum and sometimes tangled or irregularly folded in the ileum. The stretching of the strobila by strong peristalsis in the ileum may have resulted in the separation of the caudal portion of the strobila, which descended into the colon and was eventually passed per rectum.