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FIG 4. A (20 x 20 x 20 mm) proton MR spectrum (2000/144 [TR/TE]) obtained at the level of the mesencephalic cystic formation. A slight increment of Cho with no lactate is shown. This pattern is different from that observed in parasitic or tumor cysts. The increment in Cho could be due to demyelination surrounding the lesions, explained by the mass effect exerted by the spaces adjacent to parenchyma.
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