Brain<unk>  is helpful in the diagnosis of<unk> . On brain<unk> ,<unk>  is characterized by a mass which is typically hypointense on T1-weighted images and hyperintense on T2-weighted images. Calcification is observed as areas of "blooming" on T2 decay component of<unk> . T1 C + gadolinium shows heterogeneous contrast enhancement and diffusion weighted images help differentiate lower grade<unk> s from higher grade astrocytomas which have higher ADC values because of lower cellularity and greater hyaluronan proportion. MR perfusion (PWI) is 95% sensitive for diagnosis of<unk> s and 87% sensitive for distinguishing grade II from grade III<unk> s. On PWI, "chicken wire" network of vascularityresults in elevated relative cerebral blood volume (rCBV) of grade II vs grade III and rCBV above the threshold of 1.75 demonstrates more rapid tumor progression.
Oligodendroglioma MRI
Subependymal giant cell astrocytoma MRI
Oligoastrocytoma MRI
Meningioma MRI
Ependymoma MRI
Schwannoma MRI
Medulloblastoma MRI
Subependymal giant cell astrocytoma physical examination