Transverse scan of left testis. In para-testicular position an enlarged lymphatic vessel can be seen (arrow). One or more adult worms are detectable by their typical movements (filaria dance sign). The following m-mode imaging presents the dilated lymphatic vessels, containing moving adult worms, as a section marked by the cursor in the b-mode image.
Reproduced from: Mand S, Marfo-Debrekyei Y, Dittrich M, et al. Animated documentation of the filaria dance sign (FDS) in bancroftian filariasis. Filaria J 2003; 2:3. Available at:
http://www.filariajournal.com/content/2/1/3. Copyright © 2003 BioMed Central Ltd.