Fig. 10

Partial response. A 55-year-old female with breast cancer. Initial staging MRI demonstrates a large rim-enhancing left frontoparietal brain metastasis. Follow-up imaging obtained 9 months after completion of radiation (not on steroid medication) demonstrates a > 30% decrease in the size of the metastasis, no associated low ADC signal, and the absence of elevated cerebral perfusion (arrows). Spectroscopy demonstrates suppressed NAA, choline, and creatine peaks as well as an elevated lipid/lactate peak (arrowhead). Findings consistent with partial response