When Tuberculosis Starves the Body Enough to Trap the Gut: A Rare Artery Syndrome Uncovered

A sixteen-year-old boy in Ethiopia arrived at Arsi University College of Health Sciences with a story that, on its surface, looked like a straightforward case of advanced tuberculosis. He had spent three months losing weight, coughing up sputum, drenching his sheets with night sweats, and refusing food. But alongside those familiar symptoms came something far more unusual: severe abdominal pain and vomiting of green, bile-stained fluid. As clinicians would soon discover, the boy was suffering from a rare anatomical trap in which one of the body’s major arteries had effectively pinned his small intestine shut, a complication of malnutrition so uncommon in children that it can be missed until it becomes fatal.

The condition, known as superior mesenteric artery syndrome, arises from a deceptively simple piece of anatomy. The superior mesenteric artery branches off the body’s largest vessel, the abdominal aorta, and runs downward to supply the intestines. Sandwiched between these two arteries lies the third portion of the duodenum, the first stretch of the small intestine just beyond the stomach. Normally, a cushion of fat in the retroperitoneum, the space behind the abdominal cavity, holds the two arteries apart and keeps the duodenum in a roomy channel. When that fat pad is depleted, as happens in profound weight loss, the angle between the aorta and the artery narrows and the duodenum is compressed like a hose pinched between two cables.

In this patient, the compression was severe enough to block the passage of food and digestive juices entirely. Computed tomography, the imaging gold standard for the diagnosis, revealed an aortomesenteric angle of just 22 degrees and a distance of only 6 millimeters between the two vessels. Healthy individuals typically show angles far wider than this, and the measurement confirmed that the boy’s duodenum was being squeezed shut. The clinical picture matched: bilious vomiting, abdominal pain, and a body mass index of only 12 kilograms per square meter, with a mid-upper arm circumference of 13 centimeters, both confirming severe acute malnutrition. A sputum test using GeneXpert molecular diagnostics confirmed the underlying driver, Mycobacterium tuberculosis, and a household contact with confirmed pulmonary tuberculosis pointed to the likely source of infection.

The case, reported in BMC Pediatrics by Tesfa Gebremeskel and colleagues, is notable because it illustrates a vicious cycle in which each disease feeds the other. Pulmonary tuberculosis drove the boy’s anorexia and metabolic wasting, stripping away the retroperitoneal fat that protects the duodenum. The resulting arterial compression then caused vomiting and pain that made eating nearly impossible, accelerating the malnutrition further. Left unchecked, this loop can spiral quickly. The medical literature attributes a mortality of up to 33 percent to superior mesenteric artery syndrome when diagnosis is delayed, a figure that underscores how dangerous a treatable anatomical problem can become when it hides inside another illness.

What makes the case especially instructive is that the syndrome predominantly affects adolescents, who undergo rapid growth and may lose protective fat quickly during illness, yet it remains rare in younger children. That rarity means pediatricians in tuberculosis-endemic regions may not consider it when a malnourished child fails to improve. The authors argue that clinicians should maintain a high index of suspicion for the syndrome whenever standard malnutrition management stalls, particularly when vomiting or abdominal pain accompanies wasting. In resource-limited settings, where computed tomography may not be immediately available, the diagnosis can be delayed by days or weeks, and every delay compounds the risk of intestinal perforation, electrolyte chaos, or death.

Once the diagnosis was made, the treatment team faced a delicate balancing act. The standard surgical options for superior mesenteric artery syndrome include procedures that reposition the duodenum or bypass the compressed segment, but surgery in a severely malnourished, actively infected patient carries prohibitive risks. Instead, the team chose conservative management, betting that restoring the fat pad through careful nutrition would reopen the duodenal channel on its own. The boy received ReSoMal, a specialized oral rehydration solution designed for severe malnutrition, delivered through a nasogastric tube, along with careful correction of electrolyte abnormalities that often accompany wasting.

Nutritional rehabilitation in such patients must proceed with unusual caution because of a phenomenon called refeeding syndrome. When a starved body suddenly receives carbohydrates, insulin surges and drives phosphate, potassium, and magnesium into cells, potentially causing dangerous drops in blood levels of these electrolytes and triggering cardiac and neurological complications. The team anticipated this risk and monitored the boy throughout, starting feeds with F-75, a low-protein, carefully balanced therapeutic formula used in the initial phase of malnutrition treatment, and advancing to the higher-calorie F-100 formula only once he was stabilized. Intravenous antibiotics covered secondary infections, and after two weeks of nutritional stabilization, the team initiated four-drug anti-tuberculosis therapy with isoniazid, rifampicin, ethambutol, and pyrazinamide, the standard first-line regimen.

The recovery unfolded slowly but decisively. Surgery that had been planned was deferred as the boy improved clinically, a decision that validated the conservative approach. Over four months, the bilious vomiting and abdominal pain resolved completely as his nutritional status recovered and, presumably, the retroperitoneal fat pad regenerated, widening the aortomesenteric angle and freeing the duodenum. By seven months, he had achieved significant weight gain and was tolerating a full family diet, a remarkable turnaround for a patient who had arrived with one of the lowest body mass indices recorded in pediatric case reports of the syndrome.

Beyond its clinical specifics, the case carries a broader message about the interplay between infectious disease, nutrition, and anatomy in the world’s most vulnerable populations. Tuberculosis remains a leading killer in many low-income countries, and severe acute malnutrition is both a cause and a consequence of the epidemic. This report demonstrates that the complications of that intersection are not always the obvious ones. A rare vascular compression syndrome, normally associated with surgical wards and weight-loss disorders in high-income countries, can emerge silently in a teenager with tuberculosis, and it can be cured not with a scalpel but with patient, protocol-driven nutritional care. For clinicians working where tuberculosis and malnutrition overlap, the lesson is to look beyond the expected diagnosis when a patient fails to respond, because the anatomy may be telling a different story than the infection.

The authors, spanning pediatrics, radiology, public health, and surgery at Arsi University in Asella, Ethiopia, published the case as open access with written informed consent from the patient’s legal guardian, and they emphasize that no financial support was received for the work. Their combined specialties reflect the multidisciplinary effort the boy’s care demanded, from interpreting the CT measurements that confirmed the diagnosis to managing the metabolic hazards of refeeding. As tuberculosis continues to drive wasting in adolescents worldwide, reports like this one serve as a reminder that the consequences of starvation can be mechanical as well as metabolic, and that recognizing them early can mean the difference between a feeding tube and a fatal outcome.

Subject of Research: Superior mesenteric artery syndrome complicating severe acute malnutrition secondary to pulmonary tuberculosis in an adolescent

Article Title: Superior mesenteric artery syndrome complicating severe acute malnutrition secondary to pulmonary tuberculosis in an adolescent: a case report

Article References: Superior mesenteric artery syndrome complicating severe acute malnutrition secondary to pulmonary tuberculosis in an adolescent: a case report. (n.d.). https://doi.org/10.1186/s12887-026-07830-2

Image Credits: AI Generated

DOI: 10.1186/s12887-026-07830-2

Keywords: superior mesenteric artery syndrome, severe acute malnutrition, pulmonary tuberculosis, duodenal obstruction, pediatrics, case report, refeeding syndrome, computed tomography, Ethiopia, nutritional rehabilitation, aortomesenteric angle, adolescent health