[On the problem of malignant degeneration of ependymomas].
D001932:Brain Neoplasms / Q000473:pathology*; D004806:Ependymoma / Q000473:pathology*; D006801:Humans; D009369:Neoplasms; D013120:Spinal Cord Neoplasms
BRAIN NEOPLASMS/pathology; EPENDYMOMA/pathology; SPINAL CORD/neoplasms