Ependymoma (cervical cord)

Case contributed by A.Prof Frank Gaillard

Presentation

18 months of neck pain radiating down to right arm.

Patient Data

Age: 65 years
Gender: Female
Modality: MRI

There is a 9 x 11 x 20 mm intramedullary mass in the upper cervical spinal cord. It is centrally located and extends between C2/3 and mid C4 levels.  Associated cord expansion is noted. 

Pre-contrast, the mass shows heterogeneous high T2 signal and T1 signal slightly less than that of spinal cord. There is an associated tumour syrinx extending between C1/2 and the lower C4 vertebral levels (37 mm craniocaudally), at the inferior aspect of which there is low T2 signal compatible with a "hemosiderin cap". The mass shows avid, homogeneous enhancement.

The remainder of the cervical spinal cord is normal in signal and calibre.  The cervico-medullary junction is normally positioned. Posterior disc-osteophyte complexes at C5/6, C6/7, and C7/T1 mildly narrow the central vertebral canal.  The neural exit foramina are adequate.

Modality: Annotated image

Vividly enhancing intramedullary mass ( * ) is located centrally within the cord (note the cord evenly splayed around mass on axial imaging (blue arrows) ) with a prominent inferior hemosiderin cap (yellow arrow). 

The patient went on to have a laminectomy and excision of the tumour. 

Histology

MICROSCOPIC DESCRIPTION: Sections show a moderately cellular glial tumour. The tumour comprises a mixed population of cells, some showing glial features with fibrillary processes, yet others displaying more epithelioid features. There is a prominent population of cells showing signet ring cell like features. Many perivascular pseudorosettes are seen. No mitotic figures are identified and there is no necrosis or endothelial cell hyperplasia.

The tumour cells are strongly GFAP positive, show punctate dot like cytoplasmic staining for EMA, and membranous staining for CD99.  The Ki-67 proliferative index is less than 1%. 

FINAL DIAGNOSIS: The morphological and immunohistochemical features are of ependymoma (WHO Grade II)

Case Discussion

This case illustrates typical and characteristic appearances of an ependymoma with prominent hemosiderin capping. 

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Case Information

rID: 19315
Case created: 26th Aug 2012
Last edited: 4th Nov 2015
Tag: spine
Inclusion in quiz mode: Included

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