What tumor secretes dopamine?

A pheochromocytoma or a paraganglioma that exclusively secretes dopamine is extremely rare. It is usually found at extra-adrenal sites and is diagnosed as a subtype of paraganglioma.

How do you know if you have a tumor in your ear?

Common signs and symptoms of acoustic neuroma include: Hearing loss, usually gradually worsening over months to years — although in rare cases sudden — and occurring on only one side or more severe on one side. Ringing (tinnitus) in the affected ear. Unsteadiness or loss of balance.

What causes tinnitus tumors?

Acoustic neuroma or other head and neck tumors. Acoustic neuroma is a noncancerous (benign) tumor that develops on the cranial nerve that runs from your brain to your inner ear and controls balance and hearing. Other head, neck or brain tumors can also cause tinnitus.

Are there any tumors that secrete dopamine?

Such tumors are extremely rare, usually found as extraadrenal paragangliomas. This report describes measurements of plasma concentrations of free methoxytyramine, the O-methylated metabolite of dopamine, in 120 patients with catecholamine-producing tumors, including nine with extraadrenal paragangliomas secreting predominantly dopamine.

Are there any cases of dopamine secreting pheochromocytomas?

Dopamine-secreting pheochromocytomas: in search of a syndrome Pheochromocytomas rarely produce dopamine as the only catecholamine. Two cases are reported here, and a review of the literature was conducted.

How is Metyrosine used to treat dopamine-secreting tumors?

The function of metyrosine is to block dopamine synthesis; it has no alpha-blocking effect. This medication is an option for controlling symptoms but should not be used routinely in these patients. The prognosis for patients with these tumors is worse than for those with an epinephrine- and norepinephrine-secreting tumor.

What are biochemical and clinical manifestations of dopamine?

Patients with dopamine-secreting tumors are often normotensive, posing a significant diagnostic challenge ( 4 ). The difficulty of diagnosis may be further compounded by emphasis in biochemical testing on norepinephrine and epinephrine and the metabolites of these two catecholamines.