Women, African-Americans, Hispanic-Americans, Asian and Pacific Islanders are more often misdiagnosed for a condition other than stroke when in fact having stroke. In addition, adults under 44 years of age are seven times more likely to have stroke missed than are adults over 75 years of age. This is especially the case for younger people with posterior circulation infarcts. Some medical centers have used hyperacute MRI in experimental studies for people initially thought to have a low likelihood of stroke, and in some of these people, stroke has been found which were then treated with thrombolytic medication.