On an angiogram, a healthy aorta and its branches look roughly like a diagram: a clean arch, orderly divisions, vessels running more or less where anatomy textbooks put them. In children with arterial tortuosity syndrome, the same scan looks like a tangled cable. Arteries elongate, and because their endpoints are anchored, the extra length has nowhere to go except into loops, kinks, and spirals.
For decades, the condition carried a grim reputation. MedlinePlus, whose page on the disorder was last updated in 2015, still describes it as often fatal in childhood, with only milder cases surviving into adulthood. A cohort published in Biomedicines in January 2025 complicates that picture: among 21 genetically confirmed Qatari patients, researchers recorded no deaths attributable to the syndrome.
Arteries That Loop Where They Should Run Straight
Arterial tortuosity syndrome is an autosomal recessive connective tissue disorder caused by biallelic variants in SLC2A10, the gene encoding the glucose transporter GLUT10. It is genuinely rare. A 2023 report on four newly identified patients noted that, at that time, only 106 individuals with genetically confirmed disease had been described worldwide.
The vascular findings are the signature. Beyond tortuosity and elongation, patients can develop arterial narrowing, aneurysms, and dissection. Pulmonary artery involvement is common in infancy and can produce breathlessness and cyanosis in babies. Outside the vessels, the disorder shows up as distinctive facial features, hernias, joint hypermobility, skeletal abnormalities, and eye problems.
Those eye findings are more consistent than many clinicians realize. A small case series from a specialty clinic at Arkansas Children's Hospital documented myopia and thin corneas in every patient examined, with a tendency toward corneal ectasia progressing to keratoconus or keratoglobus.
One Mutation, Twenty-One Patients and No Deaths
All 21 Qatari patients carried the same homozygous variant, c.243C>G (p.Ser81Arg), which the authors associated with mild outcomes, including no mortality and reduced morbidity. Every patient had aortic tortuosity, but only two required cardiovascular surgery, and none had an arterial dissection.
The cohort's composition matters. These were children, ranging from 19 months to 13 years old, with a mean age of about five. A cohort that young cannot settle what happens in adulthood, though the authors note that this is precisely the age band the older literature described as lethal.
An earlier study of 12 newly identified families pointed in the same direction. Its patients were significantly older than those in the published literature, and only one affected relative had died, most likely from an unrelated cause. That series was not reassuring across the board: tortuosity of the aorta or large arteries was present in every patient, two adult probands aged 23 and 35 had aortic root dilation, and two patients first presented with stroke, one at eight months old.
That same study found something reassuring about carriers. Heterozygous relatives showed no vascular anomalies, and glucose metabolism was normal in the patients and carriers tested, meaning the GLUT10 defect does not translate into overt diabetes.
The likely explanation for the shifting picture is a classic problem in rare disease research. Early reports came from infants sick enough to be hospitalized and investigated, so the recorded natural history skewed toward catastrophe. As genetic testing spreads to relatives and milder presentations, the average changes.
The Findings Nobody Had Cataloged Before
Because the Qatari group pulled records across multiple specialties, it also picked up features not previously associated with the syndrome. The list is long and unusually varied: flat philtrum, bulbous nose, bilateral nasolacrimal duct obstruction, allergic conjunctivitis, latent nystagmus, café-au-lait spots, eczema and dermatitis, bilateral temporomandibular joint cysts, syndactyly of the toes, parapelvic cysts, kidney malrotation, vesicoureteral reflux, and kidney stones.
Rarer features already noted in small numbers of patients elsewhere, including leg length discrepancy, epilepsy, and migraine, also turned up.
The clinical consequence is straightforward. A child with looping arteries and a confirmed SLC2A10 variant may need surveillance well beyond cardiology, extending to kidneys, eyes, and skin. The authors also emphasized counseling to reduce cousin marriage, which drives the recessive inheritance pattern in the population they studied.
Why the Diagnosis Still Arrives Late
Imaging often supplies the first real clue. A case published in December 2025 described a boy in Bahrain who was flagged in the newborn period after desaturation at birth and was sent to intensive care. Scans showed tortuosity and kinking of the aortic arch, along with left main pulmonary artery stenosis, and the team planned stenting of the narrowed vessel. Genetic testing had not been performed, so the diagnosis remained provisional, resting on the imaging pattern.
Those authors made a point that applies well beyond Bahrain: in infancy, the external physical features of the syndrome are unreliable, so radiological findings can support the diagnosis when genetic testing is limited or inaccessible. Misdiagnosis is the other obstacle, since the syndrome is frequently mistaken for Marfan syndrome, Loeys-Dietz syndrome, and vascular Ehlers-Danlos syndrome.
None of this means the condition is safe. A longitudinal analysis of 14 patients by the CLARITY collaborative, published last year, found aortic root dilation on echocardiography in 71.4% of patients, with a median age at diagnosis of 3.3 years. The published record still includes infants with severe cardiopulmonary complications, strokes in early life, and arterial dissection. What has changed is the assumption that the diagnosis is automatically a death sentence in childhood. Families should discuss prognosis and surveillance with a clinical geneticist and a cardiologist familiar with the disorder, because the answer increasingly depends on the specific variant involved.
Key Questions Answered
What is arterial tortuosity syndrome?
A rare inherited connective tissue disorder in which large and medium-sized arteries become elongated and twisted, with added risks of narrowing, aneurysm, and dissection. It is caused by biallelic variants in the SLC2A10 gene.
How rare is it?
Very. A 2023 report noted that, at that time, only 106 individuals with genetically confirmed disease had been described worldwide.
Is it always fatal in childhood?
No. Reference sources still describe it as often fatal in childhood, but a cohort of 21 genetically confirmed Qatari children recorded no deaths from the syndrome, and an earlier multi-family study found patients older than the published literature suggested.
What symptoms show up outside the arteries?
Distinctive facial features, hernias, joint hypermobility, skeletal changes, and eye findings, including myopia, corneal thinning, and keratoconus. The Qatari cohort also documented kidney and skin findings that had not been previously cataloged.
Do carriers have any risk?
In the multi-family study, heterozygous carriers showed no vascular anomalies, and glucose metabolism was normal in both patients and carriers despite the gene's role in glucose transport.
How is it diagnosed?
Imaging usually raises suspicion, since twisted, elongated arteries are visible on CT angiography and MR angiography. Genetic testing confirms it. In infants, physical features alone are unreliable.
