Various<unk>  abnormalities can be diagnosed by microscopic analysis of the tissue sample. The pathologist (a physician<unk> ed in how disease affects the body's tissues) looks for abnormal growth, changes in cell membranes, and/or abnormal collections of cells. In Alzheimer's disease, the cortex of the<unk>  contains abnormal collections of plaques. If infection is suspected, the infectious organism can be cultured from the tissue and identified. Classification of tumors is also possible after<unk> .
Brain biopsy
Meningeal biopsy
Hemoencephalography
Cranioscopy
Lumbar puncture
Stereoelectroencephalography
CSF tap test
Ultrasound-guided lumbar puncture