ec , ( characterized in computed tomography by hypo or iso-density areas non-enhanced by contrast ) , are characterized in mri by : 1 ) an important variability of signal intensity between the different cases , and sometimes between the different parts of the same cyst , 2 ) the absence of edema in surrounding parenchyma , in spite of important mass effect , 3 ) well defined limits , permitting certainty of the extra-cerebral nature of this tumor , 4 ) the presence of calcifications easily perceptible in mri .
C0014511
ec
C0010709
cyst