Ascaris lumbricoides is the most common roundworm in warm and temperat
e areas. Although radiological features of Ascaris lumbricoides are we
ll defined, there are only a few reports on the ultrasonographic findi
ngs of intestinal ascariasis. In our two patients with no acute abdomi
nal symptoms, intestinal ascariasis was initially diagnosed by abdomin
al ultrasonography. In both patients, tubular structures in the segmen
ts of the small intestine were demonstrated by ultrasonography.