Recommended Medical Investigations in Pediatric Acute-Onset Neuropsychiatric Syndrome

Area of Science:

• Pediatric Neurology
• Child Psychiatry
• Immunology

Background:

• Pediatric acute-onset neuropsychiatric syndrome (PANS) diagnosis relies on comprehensive investigations, but their clinical utility is debated.
• Lack of comparative studies with psychiatric controls hinders understanding of PANS pathogenesis and diagnostic accuracy.

Purpose of the Study:

• To determine if recommended laboratory tests differentiate PANS from idiopathic obsessive-compulsive disorder (OCD) and/or tic disorders.
• To assess if extensive medical investigations identify underlying somatic conditions in children with PANS.

Main Methods:

• A case-control study compared 51 children with PANS to 58 children with idiopathic OCD/tic disorders.
• Evaluated 56 laboratory variables, cerebrospinal fluid, MRI, and EEG in a subsample.

Main Results:

• Abnormal laboratory findings were frequent in both PANS and control groups, with no significant differences.
• Most participants had multiple abnormal results; only one PANS case had a diagnosed somatic condition (celiac disease).
• Incidental and non-actionable findings were common.

Conclusions:

• Current laboratory investigations do not reliably distinguish PANS from idiopathic OCD/tic disorders.
• Extensive medical workups seldom identify underlying somatic conditions in PANS patients.
• The clinical utility and cost-effectiveness of current PANS diagnostic protocols require re-evaluation.