Abstract
Current ultrasound systems have significantly improved spatial and temporal resolution secondary to increased transducer frequencies, increased bandwidth, and complex signal processing such as harmonics and compound scanning. The case presented describes the differential diagnoses of small, linear, mobile echogenic foci visualized by sonography in the left epididymal tail. Differentiation of moving parasites associated with filariasis versus mobile sperm may become more difficult as the resolution of ultrasound equipment continues to improve.
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