Ependymoma (cervical cord)
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Extending from C2/3 to the midpoint of C4 is an intramedullary mass which is of high T2 signal, low T1 signal and demonstrate prominent contrast enhancement (seen on axial imaging). It has a prominent haemosiderin capping with some intrinsic high T1 signal consistent with haemorrhage. A moderate amount of vasogenic oedema extends above and below the lesion from the crater cervical junction to C7. The remainder of the cervical cord, the cervical vertebrae, and paraspinal soft tissues are unremarkable. The vertebral arteries are codominant to demonstrate normal flow voids.
The patient went on to have a laminectomy and excision of the mass.
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. Perivascular pseudorosettes are a prominent feature. 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 approximately 1%.
FINAL DIAGNOSIS: The morphological and immunohistochemical features are of an ependymoma (WHO Grade II)
This case illustrates typical and characteristic appearances of an ependymoma with prominent hemosiderin capping.
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