Tube within Tube-Ultrasonographic appearence of ascaris lumbricoides in small bowel

Hrsg image of fluid filled small bowel loops

 

Hrsg image of small bowel showing ascaris in transverse view

Ascaris lumbricoides in the gastrointestinal  tract has various features.

 Sonographic examination in the diagnosis of ascaridiasis has a high value.

The conventional method of diagnosing ascariasis is by testing the stool for the presence of the eggs.
 When there are atypical abdominal symptoms in association with a vague abdominal mass, a routine ultrasound scan using the common 3-3.5 MHz probe yields no definite findings to diagnose intestinal ascariasis.
 If a high frequency probe of -10-12 MHz is used instead, intestinal ascariasis could be definitely established.
 This case illustrates a typical worm mass diagnosed with the help of a high frequency probe.

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Roundworm infestation, one of the most common helminthic diseases worldwide, is caused by Ascaris lumbricoides, one of the largest parasites that infests the human bowel.
 A lumbricoides is virtually universal at some stage of childhood in semitropical and tropical regions. 

Hrsg image of small bowel showing ascaris in longitudinal view

A longitudinal section of a segment of the Ascaris lumbricoides shows the tubular shadow with brighter parallel walls (strip sign), marked by the arrows. 

The core is hypoechoic (inner tube sign). The patient's bowel walls are also identifiable.