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Fig. 9 —12-year-old boy with ascariasis after recent 1-year stay in
Pakistan. Patient presented with abdominal pain, emesis, and fever. Transverse
sonogram shows curvilinear structure within bowel with hyperechoic outer walls
(arrows) and hypoechoic central line (arrowhead) consistent
with ascariasis worm. Sonogram can show single central echogenic line when
bowel is collapsed, alternating hyperechoic with central hypoechoic lines when
bowel is distended, or target sign when in transverse plane of imaging of worm
in alimentary canal [5].
