Case 7
A stool specimen from a 20-year-old man was sent to the Oregon State Public Health
Laboratory for examination. An FEA (formalin-ethyl acetate) concentration was performed
and wet mounts prepared for examination. The objects seen in the images were present in
moderate numbers and ranged in size from 33 to 40 micrometers (Figures A and B). The
specimen also contained several larger objects that were forwarded to CDC for
identification. The objects averaged 1 centimeter in length. The images show one of the
submitted objects after clearing with lacto phenol solution, before (Figure C) and after
injecting with ink (Figure D). What is your diagnosis? Based on what criteria?