An MRI suggested sarcoma behind an 80-year-old man's knee. A Doppler scan before biopsy revealed a clot-filled artery aneurysm instead.

Pennsylvania passed 1,004 measles cases in 39 counties with 198 hospitalized. Where cases are rising and what families should check now.

Nova Biomedical warns its StatStrip hospital glucose meter can assign results to the wrong patient, risking insulin errors. What patients should know.

WHO's first child obesity guidelines advise against weight-loss drugs and surgery under age 10. What the advice means for U.S. parents.

Kenya confirmed its first Ebola case after a man traveled from Congo through Uganda to Nairobi. Contacts are being traced. CDC says the U.S. risk is low.