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Neuroradiology

Choroid plexus tumour

The choroid plexus can be the site of different types of tumours, primary or secondary, benign or malignant.

Secondary tumours are metastases of various origins; the most common primary tumours are choroid plexus papilloma, choroid plexus carcinoma, choroid plexus meningioma. Non-neoplastic lesions like cysts or arteriovenous malformations can also involve the choroid plexus.

Radiological diagnosis is based on location within the ventricles, mainly lateral ventricles in the trigonal region but also the fourth and more rarely the third ventricle. MR better shows a thin rim of CSF around the tumour; sometimes, however, the tumour reaches a large size that makes it difficult to appreciate a primary intraventricular origin.

Meningiomas are isointense with marked enhancement. Choroid plexus papillomas are more inhomogeneous both without and with contrast enhancement. Angiography shows as a characteristic sign hypertrophy of the choroidal arteries, mainly anterior choroidal for atrial meningiomas and papillomas.

GS