16. Brain, Acute Spontaneous Intraparenchymal Hemorrhage -
Gross
Two-thirds to three-fourths of all cases of spontaneous
intraparenchymal hemorrhage are found in the basal ganglia/thalamus
region. The qualifier "spontaneous" is used to indicate that there is
no external cause such as trauma to explain the hemorrhage. The most
common underlying reason for spontaneous intracerebral hemorrhage is
hypertension. Because arising in the morning results in a relatively
sudden increase in blood pressure, this is when spontaneous
intaparenchymal hemorrhages often occur. What is the basis of
hemorrhage in a primary intraparenchymal hemorrhage?
Answer
In the above image, the hemorrhage compresses the ipsilateral
ventricle, but the blood itself is confined to the parenchyma. Blood
sometimes dissects through the parenchyma to fill the lateral
ventricle.
