Intestinal intussusception described by ultrasound.

Written by Hu Qi Feng

Pediatrics

Updated on September 13, 2024

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The appearance of intussusception under ultrasound shows concentric or target ring-shaped mass images on a transverse section scan, and a sleeve sign on a longitudinal section scan. For an ultrasound-guided hydrostatic reduction, a balloon is inserted through the anus and inflated, connecting a T-tube to a Foley catheter with a side tube connected to a sphygmomanometer to monitor water pressure. Isotonic saline at a temperature of thirty to forty degrees is injected, and the target ring-shaped mass image can be seen retracting to the ileocecal region. The disappearance of the concentric circles or sleeve sign under ultrasound indicates the completion of this therapeutic diagnosis.

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Intussusception earliest symptoms

The earliest symptoms of intussusception are primarily abdominal symptoms, including mild abdominal distension, abdominal pain, with pain mainly around the navel. This pain generally does not show significant relief and tends to intensify. There may also be cessation of passing gas and stool, and the patient might sometimes experience nausea and vomiting. If the symptoms of intussusception do not alleviate, we carry out an abdominal imaging examination, which may reveal fluid levels, indicating intestinal obstruction, and the intussuscepted bowel can be found. At this point, early air enema reduction can be performed. If the condition is not treated timely, it can lead to aggravated symptoms of intestinal obstruction, and even require surgical treatment.

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Why does intussusception cause bloody stool?

Once intussusception occurs, only a small portion of the small intestine intussusceptions can reset themselves. Due to the continuous spasm of the sheathed intestinal tract, microcirculatory disorders occur in the intussuscepted segment. Initially, venous blood flow is obstructed, leading to tissue congestion and edema, venous varicosity, and mucosal cells secrete a large amount of mucus into the intestinal lumen, which mixes with blood and feces to form a jam-like jelly substance that is expelled. The intestinal wall becomes edematous, and the obstruction of venous return worsens, affecting the arteries, resulting in insufficient blood supply, and leading to systemic toxic symptoms. In severe cases, intestinal perforation and peritonitis can occur.

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Pediatrics

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Typical symptoms of intussusception in children

The typical symptoms of intussusception include abdominal pain, which initially presents as sudden, severe, crampy pain. The affected child may cry, appear restless, draw their knees up to their stomach, and have a pale complexion. The pain may last several minutes or longer and then relieve, with repetitions every ten to twenty minutes. The second symptom is vomiting, which is an early symptom that initially may include curdled milk and food residues, and later may contain bile or fecal matter. The third symptom is bloody stools, where approximately 85% of affected children may pass jelly-like mucus and blood within six to twelve hours of onset. An abdominal mass is often found in the upper right abdomen, and a sausage-shaped mass that is slightly movable upon touch can be felt beneath the ribs. Regarding the overall condition of the child, they may be able to attend school in the early stages without showing signs of toxicity. As the condition progresses, complications such as bowel necrosis or peritonitis can develop, leading to worsening systemic symptoms, including severe dehydration, high fever, drowsiness, coma, or shock.

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How is intussusception diagnosed?

Intussusception is one of the common acute abdominal conditions in infants and young children. The primary clinical symptoms include abdominal pain, vomiting, and "jam-like" stools, with a mass often palpable in the abdomen. Initially, the overall condition of the child is generally fine, but in the later stages, symptoms such as dehydration, lethargy, coma, and shock can appear. Any healthy infant or young child who suddenly experiences episodic abdominal pain or periodic, regular bouts of crying, accompanied by vomiting, bloody stools, and a sausage-shaped mass in the abdomen, should be highly suspected of having intussusception. Once intussusception is confirmed, timely enema treatment should be administered to the child, and if the opportunity for an enema has passed, surgical treatment should be considered.

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Pediatrics

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Causes of intussusception in children

The etiology of intussusception is divided into primary and secondary types, with 95% being primary, which is common in infants and young children. In infants, the mesentery of the ileocecal region is not yet fully fixed and has a larger degree of mobility, which is a structural factor conducive to the occurrence of intussusception. Secondary cases account for about 5%, often secondary to Meckel's diverticulum, intestinal polyps, intestinal tumors, intestinal duplications, and abdominal purpura causing swelling and thickening of the intestinal wall, which can lead to intussusception. Certain factors may cause a change in the rhythmic movement of the intestines leading to disorder, thereby inducing intussusception, such as changes in diet, viral infections, and diarrhea.