Spontaneous retroperitoneal hematoma in a patient under anticoagulant agents presenting as upper gastrointestinal bleeding

by Gabriel Carrilero-Zaragoza, Juan Egea-Valenzuela, María Moya-Arnao, María Muñoz-Tornero, Roxanna Jijón-Crespín, Paula Tomás-Pujante, Elena Iglesias-Jorquera, Josefa Parra-García, Eduardo Sánchez-Velasco, Ana Pereñíguez-López, Manuel Miras-López, Matilde Fuster-Quiñonero, Fernando Carballo-Álvarez