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Paediatric Imaging

Caudothalamic groove

an anatomical landmark on the floor of the lateral ventricle formed by the white matter of the internal capsule which forms a groove between the head of the caudate nucleus and the thalamus. In the premature infant (less than 35 weeks gestation), the germinal matrix may persist in this area and predispose the infant the development of subependymal (grade I intraventricular) haemorrhage. This landmark is used in cranial sonography to assist the detection of subependymal haemorrhage. The groove is best seen on parasagittal imaging of each lateral ventricle (Fig.1).

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Fig.1

Sagittal sonogram showing the caudothalamic groove. Note the dense signal from the choroid plexus extending to the slight dip centrally, the caudothalamic groove.
Caudothalamic groove, Fig.1