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Detection of adultWuchereria bancroftiby ultrasonography of the scrotal region in men is a suitable diagnostic tool for lymphatic filariasis, whereas there are only a few case reports of adult filariae observed by ultrasonography in women. We examined 35 microfilaraemic women ultrasonographically in sites of the body suspected as locations for worm nests. In 15 women the‘filaria dance sign’ (FDS) was detected in various locations, some being novel, such as adult worms within lymphatic vessels between muscular fibres of the thighs. The surprisingly high number of worm nests detectable in microfilaraemic women recommends ultrasonography for diagnosis and treatment efficacy monitoring of female patients infected withW. bancrofti. [ABSTRACT FROM AUTHOR]