Intradural clival chordoma and ecchordosis physaliphora: a challenging differential diagnosis: case report.

Objective: Purely intradural clival chordomas are rare neoplasms, and only a few cases have been reported. The reported cases present features similar to ecchordosis physaliphora, which is a notochordal remnant. We describe these 2 entities and their differential diagnoses, clinical courses, and management. This is the first reported case to be treated using a neuroendoscopic technique.
Clinical Presentation: A 60-year-old man presenting with memory loss underwent magnetic resonance imaging, which revealed an intradural retroclival mass without bone involvement.
Intervention: The patient underwent an endoscopic transsphenoidal-transclival procedure with subtotal removal of the tumor. Histological findings confirmed the diagnosis of a chordoma.
Conclusion: Even if some parameters exist for a differential diagnosis, ecchordosis physaliphora and intradural chordoma may represent different aspects of the spectrum of the same pathology. Intradural clival chordomas have a better prognosis with respect to classic chordomas. Therefore, in subtotal removal such as that performed in our case, postoperative radiation therapy should be performed only if a regrowth of the remnant is seen during neuroradiological follow-up.