Fig. 1From: Subcutaneous dirofilariasis in a 25-year-old male patient in Belgium on ultrasonography: a case reportA Ultrasound shows a cystic structure with a diameter of circa 8Â mm and an internal tubular serpiginous structure with parallel echogenic lines (arrow). During the investigation, there was active twirling movement of the serpentine structure. B Doppler ultrasonography showed no significant vascularization of the lesionBack to article page