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© 2003 by the American Institute of Ultrasound in Medicine
J Ultrasound Med 22:765-769 • 0278-4297

Dance of Live Adult Filarial Worms Is a Reliable Sign of Scrotal Filarial Infection

Nitin G. Chaubal, MD, Gautam M. Pradhan, DNB, DMRD, DMRE, Jyoti N. Chaubal, MD, RDMS and Subhash K. Ramani, MD

Thane Ultrasound Centre, Thane, India (N.G.C., G.M.P., J.N.C.); Jaslok Hospital and Research Centre, Mumbai, India (N.G.C.); and Tata Memorial Hospital, Mumbai, India (S.K.R.).

Address correspondence and reprint requests to Gautam M. Pradhan, DNB, DMRD, DMRE, A-201 Ravi Estate, Opposite DevDaya Nagar, Off Pokharan Rd 1, Thane 400 606, Maharashtra, India.

Objective. To determine the value of the filarial dance sign as a diagnostic sign of scrotal filarial infection and to recognize unsuspected scrotal filariasis by this sign. Methods. Eight symptomatic patients in whom the filarial dance sign was shown on high-resolution ultrasonography were studied, investigated, and followed after treatment with diethylcarbamazine citrate. Two patients underwent fine-needle aspiration. Results. Multiple foci (nests) of motile (live) filarial worms were observed in most patients. Fine-needle aspiration of the dilated lymphatic vessels in 2 patients confirmed the presence of microfilariae. Five of 8 patients had a favorable response to treatment with diethylcarbamazine citrate. Conclusions. High-resolution ultrasonography is a useful technique for diagnosing scrotal filariasis in symptomatic patients and is very useful in the follow-up period for assessing the response of worms to treatment.

Key Words: diethylcarbamazine citrate • filarial dance sign • filariasis • high-resolution ultrasonography • scrotum

Abbreviations: DEC, diethylcarbamazine citrate • FDS, filarial dance sign • HRUS, high-resolution ultrasonography




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