Case #401 – August 2015

A worm approximately three centimeters long was observed and removed during a routine colonoscopy of a 54-year-old man from Scandinavia.  The worm was sent to the CDC-DPDx Team for identification.  Figure A shows the gross worm at 10x magnification using a dissecting microscope. It was then cleared with lacto-phenol and examined at 100x magnification (Figures B and C show the anterior and posterior respectively).  A thin cross-section was made and examined at the same magnification (Figure D) and 200x (Figure E).  What is your diagnosis?  Based on what criteria? 

Figure A

Figure B

Figure C

Figure D

Figure E

Images presented in the DPDx case studies are from specimens submitted for diagnosis or archiving. On rare occasions, clinical histories given may be partly fictitious.

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