Gastrointestinal Stromal Tumor: Cause of Massive Lower Gastrointestinal Bleed in Young Patient: 1916. (October 2019) - Rashid, Mamoon Ur; Khan, Muzammil Muhammad; Ullah, Waqas; Zafar, Hammad; Hussain, Ishtiaq; Hasan, Badar; Ur Rehman, Asad FNU; Hurairah, Abu