Erratum
=======


The authors of “Disorder in Pixel-Level Edge Directions on T1WI Is Associated with the Degree of Radiation Necrosis in Primary and Metastatic Brain Tumors: Preliminary Findings” (*AJNR Am J Neuroradiol* 2019;40:[412–17](http://www.ajnr.org/lookup/volpage/40/412); [https://doi.org/10.3174/ajnr.A5958](https://doi.org/10.3174/ajnr.A5958)) reported missing references 19–21, which were cited in the text but do not appear in the “References” section. The references are provided below in the same order. The Journal regrets this error.

## REFERENCES

1.  19. Chaddad A, Tanougast C. Extracted magnetic resonance texture features discriminate between phenotypes and are associated with overall survival in glioblastoma multiforme patients. Med Biol Eng Comput 2016;54:1707–18 doi:10.1007/s11517-016-1461-5 pmid:26960324
    
    [CrossRef](http://www.ajnr.org/lookup/external-ref?access_num=10.1007/s11517-016-1461-5&link_type=DOI) 
    
    [PubMed](http://www.ajnr.org/lookup/external-ref?access_num=26960324&link_type=MED&atom=%2Fajnr%2F40%2F6%2FE33.atom) 

2.  20. Rathore S, Akbari H, Doshi J, et al. Radiomic signature of infiltration in peritumoral edema predicts subsequent recurrence in glioblastoma: implications for personalized radiotherapy planning. J Med Imaging (Bellingham) 2018;5:021219 doi:10.1117/1.JMI.5.2.021219 pmid:29531967
    
    [CrossRef](http://www.ajnr.org/lookup/external-ref?access_num=10.1117/1.JMI.5.2.021219&link_type=DOI) 
    
    [PubMed](http://www.ajnr.org/lookup/external-ref?access_num=29531967&link_type=MED&atom=%2Fajnr%2F40%2F6%2FE33.atom) 

3.  21. Ismail M, Hill V, Statsevych V, et al. Shape features of the lesion habitat to differentiate brain tumor progression from pseudoprogression on routine multiparametric MRI: a multisite study. AJNR Am J Neuroradiol 2018;39:2187–93 doi:10.3174/ajnr.A5858 pmid:30385468
    
    [Abstract/FREE Full Text](http://www.ajnr.org/lookup/ijlink/YTozOntzOjQ6InBhdGgiO3M6MTQ6Ii9sb29rdXAvaWpsaW5rIjtzOjU6InF1ZXJ5IjthOjQ6e3M6ODoibGlua1R5cGUiO3M6NDoiQUJTVCI7czoxMToiam91cm5hbENvZGUiO3M6NDoiYWpuciI7czo1OiJyZXNpZCI7czoxMDoiMzkvMTIvMjE4NyI7czo0OiJhdG9tIjtzOjE5OiIvYWpuci80MC82L0UzMy5hdG9tIjt9czo4OiJmcmFnbWVudCI7czowOiIiO30=) 

*   © 2019 by American Journal of Neuroradiology