Breakthrough rhino-orbito-cerebral mucormycosis caused by Rhizopus arrhizus during posaconazole prophylaxis after allogeneic hematopoietic stem cell transplantation: a case report and focused literature review - Jie Qu; Hui Ying; Rui-Hua Li; Da-Ping Nie; Shanshan Liang; Shuang Han (Frontiers in Medicine, 2026)