occurs in occurs in phenotype affects entity glial cell growth Abnormal basal ganglia morphology Gliosis Basal ganglia gliosis Focal proliferation of glial cells in the basal ganglia. HP:0006999 UMLS:C1864114 Gliosis refers to a proliferation of astrocytes in an area of damage of nervous tissue. Gliosis in the basal ganglia UMLS:C2750915 basal ganglion increased glial cell growth in basal ganglion