Proton MR spectroscopy and diffusion-weighted MR imaging for the diagnosis of XXXX . Report of two cases.

@entity1 @entity6551 @entity1313 @entity11 @entity1877 @entity6550 @entity378 @entity1907
With the current prevalence of @entity378 , the incidence of @entity6550 may be on the rise in industrialized nations. However, clinical findings suggestive of systemic @entity378 are frequently subtle or absent in @entity1 with @entity6550 , and no specific neuroradiologic characteristics of @entity6551 have been defined as yet. We report two cases of ring-enhanced @entity6550 in which magnetic resonance (MR) proton spectroscopy and diffusion-weighted (DW) imaging were useful in the differential diagnosis between @entity6551 and other ring-enhanced mass lesions. @entity1907 had been diagnosed in one @entity1 , but radiologic lung study and tuberculin skin test were negative in the other. DW imaging showed bright signal intensity in the core of all lesions in both @entity1 . @entity11 and metastatic @entity1313 do not have this characteristic. Proton MR spectroscopy of lesion cores showed lipid peaks and a @entity1877 peak in one, and a lipid/lactate mixture pattern in the other, which differed distinctively from those of the pyogenic brain abscess. in each case, one lesion was surgically removed. Antituberculosis drugs were started before surgery for one @entity1 and after surgery for the other. In both, the remaining lesions were reduced significantly in size. We discuss the diagnostic potential of these MR techniques and management options of @entity6550 .
