A growing, yet largely ignored, malnutrition crisis is unfolding in northwest Nigeria, which threatens the lives of tens of thousands of children, Médecins Sans Frontières /Doctors Without Borders (MSF) warned today. Since January, MSF teams, working in partnership with Nigerian health authorities in five northwestern states, have already treated more than 50,000 children with acute malnutrition, including 7,000 who required hospital care.