Text and Data Mining valid from 2019-04-09
First Online: 9 April 2019
Compliance with Ethical Standards
: The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article.
: The study was approved by the Institutional Review Board of the University of Santiago de Compostela (USC), Spain.
: All the images used in this study belong to the historical archive of the Radiology Unit of the Faculty of Medicine and Dentistry of the University of Santiago de Compostela in Spain. No specific informed consent was required,givenall participants or, as appropriate, their legal representatives, signed an informed consent to authorize the use of images for teaching or research purposes.