Pineoblastoma

Case contributed by A.Prof Frank Gaillard

Presentation

Increasing headaches.

Patient Data

Age: 70 years
Gender: Male
CT

CT brain

Pre-contrast scans showed moderate internal obstructive hydrocephalus, due to a large, partially calcified and dense mass, which appears to be centred upon the pineal gland. The quadrigeminal plate appears anteriorly displaced and the aqueduct obliterated. It does not appear to have an intimate relationship with the tentorium.

MRI

MRI brain

The irregular heterogenous enhancing pineal mass demonstrates several tiny cystic foci and eccentric coarse calcifications There is moderate mass effect on the adjacent tectum and vermis, with loss of definition and possible parenchymal invasion on the left.

There is associated aqueduct compression, with moderate hydrocephalus and hand and or signal abnormality.

Incidental note is made of minor paranasal sinus disease and polypoidal thickening at the posterior margin of the left inferior turbinate.

Pathology

Histology

The patient went on to have a craniotomy and excision of the mass. 

Histology

MICROSCOPIC DESCRIPTION: Paraffin sections show fragments of a densely hypercellular tumour. Tumour cells have small round, oval and angulated hyperchromatic nuclei and delicate processes which show strong immunostaining for neurofilament protein (NFP). Tumour cells are arranged in diffuse sheets. Prominent Homer-Wright rosettes are noted in several areas. Scattered mitotic figures are identified. No areas of necrosis are seen. Tumour cells show strong granular perinuclear immunostaining for synaptophysin. No staining for GFAP or NeuN is seen. The features are of pineoblastoma. The Ki-67/MIB-1 labelling index is approximately 6%. 

FINAL DIAGNOSIS: Pineoblastoma (WHO Grade IV)

Case Discussion

Although the imaging appearances are fairly typical of a pineoblastoma the demographics of the patient are quite unusual; the vast majority of pineoblastomas are seen in children. 

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Case information

rID: 22620
Case created: 11th Apr 2013
Last edited: 24th Jul 2017
Inclusion in quiz mode: Included

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