Presented here is an extremely rare case of intradural extraosseous chordoma with tenacious adhesion to the pons During the 5 years' follow-up period, the tumor has recurred locally twice in the prepontine region despite radical excisions and final irradiation with gamma knife. Magnetic resonance image obtained 1 year after radiosurgery demonstrated a new intradural mass growing above the tentorial hiatus, whereas the mass within the pons was markedly reduced. High resolution computed tomographic scan showed no evidence of bone involvement. Even though intradural location without bone involvement is a relatively benign occurrence, the recurrent pattern suggests an aggressiveness that correlates classic chordoma because of its invasion to the pons. Adjuvant radiotherapy will be required in this case for a long-term control.
Chordoma* ; Follow-Up Studies ; Pons ; Radiosurgery ; Radiotherapy, Adjuvant ; Recurrence