Imaging biomarkers for detection and longitudinal monitoring of ventricular abnormalities from birth to childhood

Figure 6 Fronto-occipital horn ratio. Axial T2-weighted magnetic resonance imaging illustrating the Fronto-occipital horn ratio (FOHR). It is calculated by adding the maximum diameters of the frontal (yellow arrow) and occipital (orange arrow) horns of the lateral ventricles at the level of the foramen of Monro and dividing this sum by twice the maximum intracranial biparietal diameter (white arrow). A: Normal FOHR in an 11-year-old girl with a 3-week history of headache; B: Increased FOHR in a 1-week-old full-term neonate with hydrocephalus due to intraventricular hemorrhage.