This case is a colon biopsy that contained an unexpected object:
(CLICK ON IMAGES TO ENLARGE)
For the non-pathologists, note that what we're seeing is a worm cut in cross-section. Use the internal structures to help you identify it. Another hint: notice that the worm portion shown is external to the intestinal mucosa.
![](http://3.bp.blogspot.com/_G6IliCMl5tc/SzjGK8aVw6I/AAAAAAAAA-U/29d2uR0k_VI/s400/COW7.jpg)
![](http://4.bp.blogspot.com/_G6IliCMl5tc/SzjGKj-nogI/AAAAAAAAA-M/4TaWwnGANb4/s400/COW8.jpg)
![](http://2.bp.blogspot.com/_G6IliCMl5tc/SzjGJ8MU2FI/AAAAAAAAA-E/Xw_oT4W3BNU/s400/COW9.jpg)
Identification?