Fig. 3

MRI and nasal endoscopy images at diagnosis and during the follow-up of NEC of Patient 1 and Patient 3. A MRI images of patient 1 at diagnosis. B MRI images of Patient 1 during the follow-up. Progression in the upper bound of the tumor during the follow-up of Patient 1 (red arrow). C Nasal endoscopy images at diagnosis (2018/09) and during the follow-up (2019/05) of Patient 1. D MRI images of patient 3 at diagnosis. E MRI images of Patient 3 during the follow-up. Brain metastasis during the follow-up of Patient 3 (red arrow). F Nasal endoscopy images at diagnosis (2018/12) and during the follow-up (2019/06) of Patient 3