h/o scrotal swelling gradually increasing in size
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The ultrasound study reveals linear echogenic undulating membranes within an anechoic area.
The anechoic area is a dilated lymphatic vessel measuring approximately 8 mm.
The linear echogenic areas represent the microfilariae.
They are exibiting what is known as the "filarial dance sign".
The yellow arrows show the dilated channels and the red arrow points out the microfilariae.
2 case questions available
This is a case of scrotal filariasis.
This parasitic infestation of the scrotal lymphatics is caused by Wuchereria Bancrofti.
These microfilaria form nests in the lymphatic channels causing them to dilate.
This patient also had hydrocoele on both sides.
- 1.Chaubal NG, Pradhan GM, Chaubal JN et-al. Dance of live adult filarial worms is a reliable sign of scrotal filarial infection. J Ultrasound Med. 2003;22 (8): 765-9. Pubmed citation
- 2.Mand S, Marfo-Debrekyei Y, Dittrich M et-al. Animated documentation of the filaria dance sign (FDS) in bancroftian filariasis. Filaria J.2 (1): 3. doi:10.1186/1475-2883-2-3 - Free text at pubmed - Pubmed citation