Radiological quiz.

@article{Williams1976RadiologicalQ,
  title={Radiological quiz.},
  author={Arthur G. Williams and Bhagirath Majmudar},
  journal={Radiology},
  year={1976},
  volume={120 1},
  pages={148, 158}
}
The authors report a case of Letterer-Siwe syndrome presenting primarily as a mediastinal mass erroneously diagnosed as cystic thymoma. Although thymic involvement in Letterer-Siwe syndrome is common, only 2 previous cases have involved a mediastinal mass.