1. Immunohistochemistry of ecchordosis physaliphora and chordoma;Macdonald;Can J Neurol Sci,1990
2. A case of ecchordosis physaliphora presenting with an intratumoral hemorrhage;Alkan;Turk Neurosurg,2009
3. Intradural chordoma presenting with intratumoral bleeding;Vellutini Ede;J Clin Neurosci,2016
4. Proposed diagnostic criteria, classification schema, and review of literature of notochord-derived ecchordosis physaliphora;Lagman;Cureus,2016
5. Fatal subarachnoid haemorrhage originating in an intracranial chordoma;Simonsen;Acta Pathol Microbiol Scand,1963