Prenatal sonographic description of fetuses affected by pyruvate dehydrogenase or pyruvate carboxylase deficiency.

INTRODUCTION: Pyruvate dehydrogenase deficiency (PDHD) and pyruvate carboxylase deficiency (PCD) are diseases with severe neonatal forms, and their low prevalence makes them difficult to diagnose during pregnancy. Our objective was to describe prenatal ultrasound features that may be suggestive of these diagnoses.

METHODS: We analyzed 3 cases from our institution and reviewed 12 published cases of PDHD and 6 cases of PCD, recording all of the ultrasound signs, as well as magnetic resonance (MR) findings when available. Because of the small number of cases of PCD, we also included post-natal signs that could have been observed during imaging during pregnancy, for a total of 11 cases of PCD.

RESULTS: We conclude that PDHD can be suggested in the presence of ventriculomegaly or paraventricular cysts, associated with an abnormality of the cerebral parenchyma such as abnormal gyration or involvement of the corpus callosum. PCD can be suggested in the presence of ventriculomegaly, frontal horn impairment associated with sub-ependymari and paraventricular cysts.

DISCUSSION: When confronted to the ultrasound abnormalities we described, and after eliminating the most frequent etiologies, a metabolic deficiency should be considered. Furthermore, the hereditary character of these diseases makes that it is important to send the family with genetic advice in particular in case of history of a foetal death in utero or a death neonatal unexplained.