Vera Baptista1, Inês Azevedo2, Gisela Rio3, Carla Moreira1. 1. Department of Pediatrics, Hospital de Braga, Braga, Portugal. 2. Department of Pediatrics, Faculty of Medicine, Centro Hospitalar S João, Oporto, Portugal. 3. Department of Radiology, Hospital de Braga, Braga, Portugal.