gray matter abnormalities
Introduction
Introduction Ectopic gray matter is a manifestation of abnormal gray matter. The diseases associated with abnormal gray matter are glioblastoma, glioblastoma, pediatric cerebral hemisphere glioma, and glioma. Symptoms associated with abnormal gray matter are sluggish, calcified, abnormal gray matter, edema, and small head. The cerebral gray matter ectopic is caused by the inability of the proliferating neuroblasts to move from the periphery of the ventricles to the gray matter (the darker part of the central portion visible on the transverse section of the spinal cord is called "grey matter") during embryonic development.
Cause
Cause
The cerebral gray matter ectopic is caused by the inability of the proliferating neuroblasts to move from the periphery of the ventricles to the gray matter (the darker part of the central portion visible on the transverse section of the spinal cord is called "grey matter") during embryonic development. A typical gray matter island is located around the ventricles and can hang over the ependymal membrane and protrude into the lateral ventricle. The large focal gray matter is ectopic, located in the center of the semi-oval, and can have a mass effect.
Examine
an examination
Related inspection
Brain CT examination brain MRI examination EEG examination brain nerve examination
[clinical performance]
Small focal gray matter ectopic is generally asymptomatic, typical symptoms often have mental retardation, seizures and abnormal brain development.
[Image performance]
1.CT performance:
1 The ectopic gray matter is located in the semi-oval center or the periventricular white matter area, showing a relatively high density, which is equal to the normal brain cortex density.
2 Enhanced scan showed that the lesion was consistent with the enhancement of the normal cerebral cortex.
3 no edema around the stove.
4 can be associated with microcephaly, cerebellar hypoplasia and so on.
2.MR performance:
1 gray matter signal appears in the white matter of the brain, connected or not connected with the cortex, that is, the T1 weight is slightly lower, and the T2 weight is slightly higher.
2 large gray matter ectopic with place-holder effect, compression of ventricle deformation, should be differentiated from better differentiated glioma.
3 often combined with cerebral schizophrenia or other malformations.
4 no enhancement after enhancement.
Diagnosis
Differential diagnosis
Differential diagnosis of gray matter abnormalities:
1 gliosis: CT plain scan is usually equal to the cerebral cortex, but there are many mild enhancement, some around edema, and some visible calcification.
2 low-grade astrocytoma: CT plain scan is usually equal or slightly lower density with white matter, when it is equal to the cortex and the enhanced scan is not enhanced, H is more difficult to identify, but astrocytoma There is a mass effect and peritumoral edema.
3 lymphoma: occurs in the ventricles, CT scan is usually equal density or slightly higher density, but there is edema around the tumor, enhanced scan lesion enhancement.
