Diffusion weighted magnetic resonance imaging (DWI) is an imaging technique which provides tissue contrast by the measurement of diffusion properties of water molecules within tissues. Diffusion is expressed in an app...Diffusion weighted magnetic resonance imaging (DWI) is an imaging technique which provides tissue contrast by the measurement of diffusion properties of water molecules within tissues. Diffusion is expressed in an apparent diffusion coefficient (ADC), which reflects the diffusion properties unique to each type of tissue. DWI has been originally used in neuroradiology. More recently, DWI has increasingly been used in addition to conventional unenhanced and enhanced magnetic resonance imaging (MRI) in other parts of the body. The reason for this delay was a number of technical problems inherent to the technique, making DWI very sensitive to artifacts, which had to be overcome. With assessment of ADC values, DWI proved to be helpful in characterization of focal liver lesions. However, DWI should always be used in conjunction to conventional MRI since there is considerable overlap between ADC values of benign and malignant lesions. DWI is useful in the detection of hepatocellular carcinoma in the cirrhotic liver and detection of liver metastases in oncological patients. In addition, DWI is a promising tool in the prediction of tumor responsiveness to chemotherapy and the follow-up of oncological patients after treatment, as DWI may be capable of detecting recurrent disease earlier than conventional imaging.This review focuses on the most common applications of DWI in the liver.展开更多
Granular cell tumor(GCT)of the breast is an unusual neoplasm,tipically benign,it represents between 5-6% of all GCT cases.These tumors are more common in middle-aged premenopausal women with a greater predilection Afr...Granular cell tumor(GCT)of the breast is an unusual neoplasm,tipically benign,it represents between 5-6% of all GCT cases.These tumors are more common in middle-aged premenopausal women with a greater predilection African American race[1].Nevertheless,there are also cases described in men[2-4].Almost all of them are favorable,the malignant cases are uncommon(only 1-3%).Sometimes it could be clinically and radiologically confused with a malignant breast tumor;so it's very important to make a differential diagnosis.The choice therapy is an extensive local extirpation with free margins[5],without the need for adjuvant chemotherapy or radiotherapy.Our case is a 61-year-old woman with a GCT,and three years ago a history of breast carcinoma in the same breast.展开更多
文摘Diffusion weighted magnetic resonance imaging (DWI) is an imaging technique which provides tissue contrast by the measurement of diffusion properties of water molecules within tissues. Diffusion is expressed in an apparent diffusion coefficient (ADC), which reflects the diffusion properties unique to each type of tissue. DWI has been originally used in neuroradiology. More recently, DWI has increasingly been used in addition to conventional unenhanced and enhanced magnetic resonance imaging (MRI) in other parts of the body. The reason for this delay was a number of technical problems inherent to the technique, making DWI very sensitive to artifacts, which had to be overcome. With assessment of ADC values, DWI proved to be helpful in characterization of focal liver lesions. However, DWI should always be used in conjunction to conventional MRI since there is considerable overlap between ADC values of benign and malignant lesions. DWI is useful in the detection of hepatocellular carcinoma in the cirrhotic liver and detection of liver metastases in oncological patients. In addition, DWI is a promising tool in the prediction of tumor responsiveness to chemotherapy and the follow-up of oncological patients after treatment, as DWI may be capable of detecting recurrent disease earlier than conventional imaging.This review focuses on the most common applications of DWI in the liver.
文摘Granular cell tumor(GCT)of the breast is an unusual neoplasm,tipically benign,it represents between 5-6% of all GCT cases.These tumors are more common in middle-aged premenopausal women with a greater predilection African American race[1].Nevertheless,there are also cases described in men[2-4].Almost all of them are favorable,the malignant cases are uncommon(only 1-3%).Sometimes it could be clinically and radiologically confused with a malignant breast tumor;so it's very important to make a differential diagnosis.The choice therapy is an extensive local extirpation with free margins[5],without the need for adjuvant chemotherapy or radiotherapy.Our case is a 61-year-old woman with a GCT,and three years ago a history of breast carcinoma in the same breast.
