A case of @entity424 with anaplastic features in 15-year-old @entity1 is reported. The @entity5 was located in the intradural space extending to the 12th thoracic to 2nd lumbar vertebral level. It was excised with the accompanying spinal arch of the T12 to L2 vertebra. At operation, the @entity5 was not attached to the surrounding soft and bony tissues. The @entity5 , measuring 49 x 19 x 15 mm, was brownish-yellow in color and involved the conus medullaris and filum terminale. Histologically, the @entity5 was composed of biphasic features of a hypercellular papillary growth area and a hypocellular myxoid area. In the papillary growth area, ependymal rosettes and perivascular pseudorosettes were observed. These findings were consistent with those of a @entity424 , although multiple foci of punctate @entity39 within the @entity5 and proliferation of endothelial cells showing glomeruloid structures were observed. Many mitotic figures were also observed. In addition, the Ki-67 labeling index of @entity5 cells was 10.1%. These findings are unusual for @entity424 , and therefore, it appeared that the diagnosis of @entity424 with anaplastic features was appropriate.

XXXX with anaplastic features.

@entity1 :: ('9606', 'Species') :: ['boy'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity424 :: ('MESH:D004806', 'Disease') :: ['myxopapillary ependymoma'] @entity39 :: ('MESH:D009336', 'Disease') :: ['necrosis']
@entity424 :: (MESH:D004806,Disease) :: ['Myxopapillary ependymoma']
