Pediatric Radiology > Neurological > Head Ultrasound > Germinal Matrix Hemorrhage
Germinal Matrix Hemorrhage Grade 1
The germinal matrix is the stem source for neuroblasts and is a fetal structure only. It typically involutes by term but is still present in premature infants. The germinal matrix is very vascular and is prone to hemorrhage. It lies within the caudothalamic groove, which is the space between the caudate nucleus head and the thalamus. Hemorrhage is seen as echogenic material within the caudothalamic groove. Choroid plexus is also echogenic and care should be made not to misinterpret choroid for hemorrhage; normal choroid plexus does not extend anterior to the caudothalamic groove on the parasagittal views. Germinal matrix hemorrhage is classified into four grades, I-IV. Grade IV hemorrhage is thought to be a venous infarction hemorrhage rather than direct extension from the germinal matrix.
|Coronal, Grade I with hyperechoic hemorrhage in caudothalamic groove|
|Coronal, Grade I hemorrhage showing evolution to cystic changes|
|Sagittal, Hyperechoic hemorrhage in caudothalamic groove|
|Sagittal, Grade I hemorrhage showing evolution to cystic changes|
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