Intussusception: How to Diagnose

Written by Yao Li Qin
Pediatrics
Updated on January 19, 2025
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Intussusception is one of the most common acute abdominal conditions in infants and toddlers, primarily seen in children under one year old. It refers to the condition where part of the intestine and its mesentery slip into an adjacent intestinal lumen, causing obstruction at the root of the intestine. The diagnosis of intussusception in children is mainly based on clinical symptoms. A previously healthy child may suddenly experience an episode of severe, regular, intermittent colicky pain. The child may appear restless, crying, with knees bent, a reduced amplitude of movement, and a pale complexion, with the abdominal pain easing after 10 to 20 minutes. The child may also vomit and pass bloody stools. Bloody stools are a very important symptom; approximately 85% of cases will pass jelly-like, mucousy bloody stools within 6 to 12 hours of onset, or even if there is no bloody stool visible, rectal examination can reveal its presence. A sausage-shaped mass can be felt in the abdomen. Furthermore, an ultrasound can show a typical image of a concentric circle or target-sign mass. Under ultrasound monitoring, procedures such as air or hydrostatic enema can be performed, which help in the early diagnosis of intussusception.

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Can intestinal intussusception have bowel movements?

After the occurrence of intussusception, the patient's symptoms often manifest as those of intestinal obstruction, causing significant abdominal pain, cessation of gas and stool passage through the anus, and a palpable abdominal mass can be felt. Imaging studies can clearly indicate signs of intussusception. Once intussusception occurs, the patient stops passing stool, and symptoms such as vomiting and nausea also occur. Once diagnosed, it is crucial to treat promptly, including air enema reduction or surgical treatment, to promptly address the symptoms of intussusception, prevent the worsening of intestinal obstruction symptoms, and avoid severe complications such as intestinal necrosis, which can endanger the patient's life.

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Caused by infantile intussusception

Intussusception is divided into primary and secondary types, with 95% being primary cases, most commonly seen in infants and young children. This is due to the fact that the mesentery of the ileocecal part in infants and young children is not yet fully fixed and has a greater degree of mobility, which are structural factors that facilitate the occurrence of intussusception. The remaining 5% are secondary cases generally occurring in older children, where the affected intestines often have a clear organic cause, such as a Meckel's diverticulum turning into the ileal lumen, serving as the starting point for intussusception. Other causes like intestinal polyps, tumors, duplications, or abdominal purpura can cause the intestinal wall to swell and thicken, which can also trigger intussusception.

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Does intussusception require a CT scan?

Intussusception is commonly diagnosed through routine abdominal ultrasound examinations, which have a positive rate of over 90%. In the ultrasound, the transverse section of the intussusception can show concentric circles or target ring-shaped mass images, and the longitudinal section may reveal the sleeve sign. Additionally, a barium enema can be employed, along with X-ray imaging. Under X-ray, the lead point of intussusception appears as a mass shadow, and air enema reduction treatment can be performed concurrently. Generally, CT is not used as a routine diagnostic tool.

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Written by Hu Qi Feng
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Symptoms of intussusception in infants

The clinical manifestations of intussusception mainly include abdominal pain, vomiting, bloody stools, and an abdominal mass. The abdominal pain is often spasmodic and regular, manifesting as sudden severe colicky pain. The child appears to be crying and restless, with knees drawn up to the abdomen, pale complexion, and the pain lasts for several minutes or longer but lessens after; it recurs every ten to twenty minutes, accompanied by intestinal movements. Vomiting is an early clinical symptom, initially consisting of milk curds or food residue, and later may include bile and fecal-like liquid. Bloody stool is an important symptom, appearing within the first few hours; initially, the stools can be normal, with about 85% of cases excreting jam-like mucoid bloody stools within six to twelve hours of onset. The abdominal mass is often located in the upper right abdomen below the costal margin, where a slight, tender mass can be palpated.

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Can pediatric intussusception be cured?

Once intussusception occurs, only a small portion of the small intestinal intussusception can reduce on its own. Those occurring in the colon or where re-intussusception occurs generally cannot reduce spontaneously and require enema therapy or surgical treatment. Enema therapy refers to cases where the intussusception occurs within forty-eight hours, the overall condition is good, there is no abdominal distension, no obvious dehydration or electrolyte disorders, and air or barium enema can be used. If the condition persists for more than forty-eight hours, the overall condition is poor, with symptoms such as dehydration, lethargy, high fever, shock, significant abdominal distension, signs of peritoneal irritation, multiple occurrences of intussusception, prior organic changes, or situations requiring surgical treatment for small bowel intussusception.