Succinate dehydrogenase deficient gastrointestinal stromal tumor in a three month old boy with a fatal clinical course: a case report and review of literature oleh Bei-Bei Lv, Jia-Mei Li, Zhi-Gang Yao, Xian-Kui Cheng, Fu-Xin Ren, Wen-Jing Su, Ye-Jun Qin, Zhou Wang, Zhi-xin Cao