Castro-Poças, FMAraújo, TPSilva, JDLopes, CDMascarenhas-Saraiva, M2016-01-312016-01-312015Rev Esp Enferm Dig. 2015 Dec;107(12):759-60.http://hdl.handle.net/10400.26/11137Duodenal gastrointestinal stromal tumors (GISTs) are a very rare condition. The pre-operative diagnosis can be a challenge but it is very important because GISTs have singularities that differ from other tumors and their location in the duodenum itself can have a major role in the choice of the surgical approach. We present two cases of duodenal GISTs where endoscopic ultrasound had a single role in their management, namely allowing the possibility to obtain material for immunocytochemical pre-operative diagnosis and regarding the precise relation to the papilla of Vater. The patients were operated and histological examination confirmed the diagnosis in both cases.engTumores do Estroma GastrointestinalNeoplasias DuodenaisEndossonografiaEndosonographyNeoplasias DuodenaisGastrointestinal Stromal Tumorsjournal article