The value of MRI in diagnosis of cubital tunnel syndrome / 实用放射学杂志

Objective To study the value of magnetic resonance imaging (MRI)in diagnosis of cubital tunnel syndrome (CuTS). Methods We studied the findings of electrophysiological examination and MRI in 30 elbows of 23 patients with CuTS and 15 elbows of 1 5 controls.We observed the motor conduction velocity (MCV),cross sectional area (CSA)and relative signal intensity (RSI)of the ulnar nerve acrossing the elbow at the point of largest size proximal to the entrapment point (CSA1 ,RSI1 )and the entrapment point (CSA2 ,RSI2 ).Then we calculated the ratio of CSA (CSAR=CSA1/CSA2 ),and the ratio of RSI (RSIR=RSI1/RSI2 ).Results The value of CSA1 and RSI1 was significantly greater than CSA2 ,RSI2 in the patient group (P<0.05).The value of CSA1 ,RSI1 , CSAR and RSIR in patients were significantly larger than that in controls (P<0.05).MCV was negatively correlated with CSA1 and CSAR in the patient group (r=-0.62,r=-0.53).There were no correlation between MCV and RSI1 ,RSIR in the patient group. The area under ROC curve of CSAR was the largest 0.94 (95% CI,0.83-1).The optimum cutoff point of CSAR was 1.83.The CSAR had sensitivity of 93.3% and specificity of 80% in diagnosis of CuTS.Conclusion MRI combined with the electrophysiologi-cal examination shows a high accuracy of locating the entrapment point of ulnar never lesion at the elbow.The CSAR of the ulnar nerve is the best MRI parameters in diagnosis of CuTS.

The research on distinguishing benign from malignant breast lesions by diffusion-weighted MR imaging / 中华放射学杂志

Objective To investigate the value of apparent diffusion coefficient (ADC) of diffusion-weighted magnetic resonance imaging (DW-MRI) in distinguishing benign from malignant breast lesions. Methods ADC in 26 normal breasts, 24 malignant breast lesions, and 30 benign breast lesions confirmed by operation and pathology were calculated, respectively, and their differentiations in statistics were compared. The differentiations of different ADCs (b=1000-0, 500-0, 1000-500 s/mm2) were also compared. EPI (TR 2900 ms, TE 84 ms, thickness 5 mm) was used in order to acquire the imaging. Results There were significant differences among the ADC values of normal breast tissue, benign, and malignant lesions. The ADC of malignant lesions was lower than those of normal breast tissue and benign lesions, and the ADC of benign lesions was lower than that of normal breast tissue. There were significant differences among the ADC value of b=1000-0, 1000-500, and 500-0 s/mm2. The lower the b value, the higher the ADC. The sensitivity and specificity of ADC for the diagnosis of malignant lesion were 64% and 96.7% if the upper bound of 95% confidence interval was set as a differential level. Conclusion The differentiation of benign from malignant breast lesions by ADC is applicable, although the sensitivity is low, the specificity is high.

CT and MRI Manifestations of Hemangiopericytoma in Central Nervous System / 实用放射学杂志

Objective To investigate the CT and MRI features of the hemangiopericytoma (HPC) in central nervous system(CNS) and improve its diagnostic accuracy. Methods The CT and MRI features of the HPC in CNS proved by operation and pathology were retrospectively analyzed and the criteria of diagnosis and differential diagnosis were summarized.Results 7 of 9 cases were intracranial and 2 were intraspinal. The lesions appeared homogeneous high density in 4 cases on plain CT scans and 3 cases appeared inhomogeneous density, 4 cases appeared isointense with cortical gray matter on both T_1-weighted and T_2-weighted images, 3 cases were heterogeneous. All contrast-enhanced scans showed marked enhancement.Conclusion The accuracy diagnosis of HPC in CNS can be made by CT and MRI.