112.MR features of cavernous angioma is /are
a. focal central heterogeneity containing areas corresponding to subacute-chronic hemorrhage (methemoglobin)
b. circumferential complete rings of markedly hyperintense iron-storage forms around low -intensity central areas
c. no mass effect or edema
d. no demonstrable feeding arteries or draining veins associated with developmental venous anomalies
e. contrast enhancement
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