Clinical and neuroimaging patterns of perinatal intracranial haemorrhage in fetuses and term-born neonates: a prospective observational cohort study.

Objectives: To characterise perinatal, clinical and neuroimaging patterns and aetiology of perinatal intracranial haemorrhage (pICH), and to assess potential differences between cases diagnosed antenatally and postnatally.

Methods: Prospective, observational, single-centre study of 110 consecutive cases of pICH identified in the fetal or neonatal period or diagnosed with presumed pICH between 2014 and 2023. Prematurity-related cases were excluded. Antenatal and postnatal MRI data were analysed for patterns and mechanisms of haemorrhage and their potential aetiology. Potential associations between pICH with perinatal and clinical risk factors were also explored.

Results: Fifty-nine of the 110 included cases (53.6%) were diagnosed antenatally (termination of pregnancy, n=22), and postnatal data on 81/88 (92%) children were available. Intraventricular haemorrhage (IVH) was the most common haemorrhage type (83/110 (75.5%)) and was more common prenatally (p=0.004). Subpial haemorrhage was exclusively diagnosed postnatally (p<0.001), and it was more commonly detected in primigravida women (p=0.013). The germinal matrix was the most common origin of IVH (n=56, 50.9%) occuring more frequently prenatally (p<0.001), whereas sinus venous thrombosis-related IVH was more commonly detected postnatally (p=0.002). Subdural haemorrhage was associated with haematological abnormalities (p=0.023). Genetic disorders caused 31.9% of the cases (15 of 47 tested cases). Genetic disorders and associated congenital anomalies were more common in the prenatally diagnosed group (p=0.038 and p=0.04, respectively).

Conclusions: The patterns and pathogenesis of pICH appear to be different for prenatally and postnatally diagnosed cases and for types of haemorrhages. Given the important role of genetic factors in prenatal intracranial haemorrhage, next-generation sequencing is indicated in these cases.