Possible association between congenital cytomegalovirus infection and autistic disorder.
Kids born with CMV who show subependymal cysts may be at higher risk for autism, so flag these cases for close developmental watch.
01Research in Context
What this study did
Doctors tracked seven children who were born with active cytomegalovirus (CMV) infection. Two of these kids later met criteria for autistic disorder. Brain scans showed small cysts near the ventricles and patchy white-matter changes in both autistic cases.
This was a small case series, not a trial. The goal was to flag CMV plus certain brain marks as a possible early warning sign for autism.
What they found
Two out of seven CMV-positive children developed autism. Both had the same brain picture: subependymal cysts and periventricular white-matter changes. The other five CMV-positive kids did not receive an autism diagnosis.
The team suggested that CMV infection during pregnancy, when it causes these specific brain changes, might be one route to autism in a small subgroup.
How this fits with other research
Matson et al. (2004) published a near-copy one year later: three more children with congenital CMV who also developed autism. Together the two case series give the same signal—CMV plus brain cysts keeps showing up.
Maeyama et al. (2018) pooled these tiny studies into a meta-analysis. The odds ratio looked huge (11.31), but the authors warn the numbers are too small to trust. So the 2003 finding still stands as a red flag, not proof.
Gillberg et al. (1983) scanned autistic kids and found that about one in four had gross CT abnormalities. Their work says brain changes are common in autism; Yushiro et al. narrow the focus to one infection that can cause those changes.
Why it matters
You will not meet many CMV-positive clients, but when you do, ask about neonatal brain scans. If the report mentions subependymal cysts or white-matter injury, monitor social-communication milestones extra closely. Early signs can be subtle, so start screening before age two and loop in the pediatrician for repeat imaging if delays emerge. Document any CMV history in your intake—this rare medical route to autism is easy to miss but worth tracking for both prognosis and family counseling.
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02At a glance
03Original abstract
We encountered seven children with symptomatic congenital cytomegalovirus (CMV) infection from 1988 to 1995, of whom two (28.6%) developed typical autistic disorder. Case 1: A boy born at 38 weeks' gestation with a birth weight of 3164 g showed generalized petechiae, hepatosplenomegaly, and positive serum CMV-specific IgM antibodies. He was profoundly deaf, mentally retarded, and exhibited a lack of eye contact, stereotyped repetitive play, and hyperactivity. Case 2: A boy delivered at 39 weeks gestation with a birthweight of 2912 g showed non-progressive dilatation of the lateral ventricles observed postnatally. CMV-specific IgM antibodies were positive and CMV-DNA in the urine was confirmed by PCR. The boy was mentally retarded but not deaf. He showed no interest in people and delayed speech development. Subependymal cysts were detected by cranial ultrasound after birth in both patients. This is the first report describing subependymal cysts and the later development of AD. Cranial magnetic resonance imaging revealed an abnormal intensity area in the periventricular white matter suggestive of disturbed myelination; however, no migration disorders were found in our patients. These findings suggest that the timing of injury to the developing brain by CMV may be in the third trimester in some patients with autistic disorder.
Journal of autism and developmental disorders, 2003 · doi:10.1023/a:1025023131029