The inner tube sign in Ascariasis

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Correspondence to Kabilan Chokkappan.

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Video 1. Real time ultrasound clip showing the mobile adult worm with re-demonstration of its sonographic features. Note a target appearance of the worm on axial cross section. Mobility on ultrasound depends on in-vivo viability of the worm at the time of scanning. Supplementary material 1 (WMV 1879 kb)

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Chokkappan, K., Subramanian, M. The inner tube sign in Ascariasis. Abdom Radiol 44, 1193–1194 (2019).

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  • Tube Signal
  • Adult Roundworms
  • Echogenic Stripe
  • Fluid-filled Lumen
  • Tuber Appearance