Patients who were diagnosed as having brain tumors in the results of interpretations of radiograms of head MRI tests.
Criteria of case 2
Patients who had clinically significant cerebrovascular damage (stenosis and cerebral stroke) identified in the results of interpretations of radiograms of head MRA or MRI testsNote 1,2.
Control group ()
Criteria of control
Applying to any of the above names (more than one item can be selected)
Patients who did not show clinically significant abnormalities upon head MRI or head MRA tests.
Note 1: definition of clinically significant cerebrovascular stenosis. Stenosis in 50% of the internal carotid artery, common carotid artery, forebrain/midbrain/hindbrain artery, vertebral artery, and basilar artery. Note 2: definition of clinically significant cerebral stroke. (i) Findings of brain infarction on images that clearly explain symptoms in the medical records. (ii) Findings of brain infarction in diffusion MRI. (iii) Findings of brain hemorrhaging determined to be within four weeks after onset.