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Glomus jugulare tumour

a paraganglioma involving the glomus jugulare, a microscopic collection of chemoreceptor tissue in the adventitia of the bulb of the jugular Vein. It may cause paralysis of the vocal cords, attacks of dizziness, blackouts, and nystagmus. It is not resectable but radiation Therapy is effective. It regresses slowly, but permanent control is regularly achieved.