Fetal Trimethadione Syndrome

Fetal trimethadione syndrome (also known as paramethadione syndrome, German syndrome, tridione syndrome, among others) is a set of birth defects caused by the administration of the anticonvulsants trimethadione (also known as Tridione) or paramethadione to epileptic mothers during pregnancy.

Fetal trimethadione syndrome is classified as a rare disease by the National Institute of Health's Office of Rare Diseases, meaning it affects less than 200,000 individuals in the United States.

The fetal loss rate while using trimethadione has been reported to be as high as 87%.

Presentation

Fetal trimethadione syndrome is characterized by the following major symptoms as a result of the teratogenic characteristics of trimethadione.

• Cranial and facial abnormalities which include; microcephaly, midfacial flattening, V-shaped eyebrows and a short nose
• Cardiovascular abnormalities
• Absent kidney and ureter
• Meningocele, a birth defect of the spine
• Omphalocele, a birth defect where portions of the abdominal contents project into the umbilical cord
• A delay in mental and physical development

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Diagnosis

Treatment