Patients with known potentially anaphylactic allergic reactions to gadolinium-diethylenetriamine penta-acetic acid (DTPA) Patients with known potentially anaphylactic allergic reactions to gadolinium- diethylene triamine pentaacetic acid (DTPA) Patients with a known allergy to gadolinium-DTPA Known sensitivity to gadolinium-DTPA. Known sensitivity to gadolinium-DTPA Patients with known potentially anaphylactic allergic reactions to gadolinium-diethylenetriamine penta-acetic acid (DTPA) Known allergic reaction to gadopentetate dimeglumine (Gd-DTPA) Known allergic reaction to diethylene triamine pentaacetic acid (Gd-DTPA) Known allergic reaction to gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA) Known reaction to gadopentetate dimeglumine (Gd-DTPA) Patients who have presence of a known contraindication to DCE-MRI may not participate in that portion of the study:\r\n* Known reaction to gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA), contrast agent \r\n* Chronic kidney disease\r\n* Nursing women Women who have had a moderate or severe contrast reaction to intravenous gadolinium-diethylenetriamine pentaacetic acid (DTPA)