Pheochromocytoma differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ahmad Al Maradni, M.D. [2] Mohammed Abdelwahed M.D[3]

Overview

Pheochromocytoma must be differentiated from other causes of paroxysmal hypertension including severe paroxysmal hypertension (pseudopheochromocytoma), panic disorder, factitious hypertension, carcinoid syndrome, migraine headache, hyperthyroidism, renovascular hypertension, hypoglycemia, labile hypertension (White coat hypertension), stroke, compression of the lateral medulla, seizures, baroreflex failure and drugs.

Differentiating pheochromocytoma from other diseases

Pheochromocytoma must be differentiated from other causes of paroxysmal hypertension. The differentials include:

Disease	Symptoms	Signs	Investigations
Pheochromocytoma	The symptoms of a pheochromocytoma are those of sympathetic nervous systemhyperactivity and include: Palpitations (especially in epinephrine producing tumors)[3] Anxiety  Sweating Headaches (90 % of patients) Paroxysmal attacks of hypertension May be asymptomatic (incidentally discovered in MEN syndrome patients)	Tachycardia Hypertension, including paroxysmal (sporadic, episodic) high blood pressure, which sometimes can be more difficult to detect. Orthostatic hypotension	High-risk patients: Plasma fractionated metanephrines 24-hour urinary fractionated metanephrines, catecholamines Imaging studies (CT scan, MRI and  iodine-123-meta-iodobenzylguanidine or MIBG scintiscan)[2] Low-risk patients: 24-hour urinary fractionated catecholamines and metanephrines[4]
Pseudopheochromocytoma	Paroxysmal activation of the sympathetic system causing: Emotional distress Acute onset of high blood pressure Headache Chest pain Nausea Palpitations Flushing Duration of attacks ranges from minutes to hours Physical symptoms occur before feeling fear	Hypertension Tachycardia	Increase in plasma catecholamines between and during attacks.
Panic attacks	Paroxysms of increased sympathetic activity Episodes of fear or panic attacks Chest pain Headache Palpitations Flushing Response to antidepressants Fear precedes physical symptoms.		Laboratory studies that can exclude medical disorders other than panic disorder include: Serum electrolytes Serum glucose Cardiac enzymes Urine toxicology screening
Labile hypertension (White coat hypertension)	Elevated blood pressure in a clinical setting but not in other settings[1]		Ambulatory blood pressure monitoring and patient self-measurement using a home blood pressure monitoring device are being increasingly used to differentiate patients with white coat hypertension from patients with true hypertension.
Hyperthyroidism	Weight loss Heat intolerance Tremors Palpitations Anxiety Increased bowel disturbances Shortness of breath	Goiter Skin flushing Proptosis Increased sensitivity of beta receptors in the heart to catecholamines due to an effect of thyroid hormones increase cardiac work and output Systolic hypertension	Low thyroid-stimulating hormone (TSH) High free thyroxine (T4) concentration High triiodothyronine (T3) concentration
Renovascular hypertension	Common in individuals < 30 years or > 55 years Abrupt onset of hypertension Accelerated hypertension that was previously well-controlled Refractory hypertension to 3 anti-hypertensive medications Headache Nausea Subconjunctival hemorrhage	Bruit can be heard over the abdomen	Duplex ultrasonography may be used as an initial screening tool for diagnosis of atherosclerotic renal artery stenosis Ultrasonography (might not be very accurate in obese patients or those with intestinal gas)[1]
Stroke and compression of lateral medulla (Lateral medullary syndrome)	Extensive unilateral infarction of the brain stem in the region of the nucleus tractus solitarius may result in partial baroreflex dysfunction, increased sympathetic activity, and neurogenic paroxysmal hypertension		CT shows mass compressing lateral medulla or infarction in the same area
Seizures	According to type; it may be focal or generalized, clinical or subclinical: tonic-clonic seizure: Repetitive twitches of arm and legs Tongue bitting Loss of consciousness Symptoms occur suddenly and may persist Muscle tension or tightening that causes twisting of the body, head, arms, or legs Amnesia Mood changes (fear, panic, or laughter) Change in sensation of the skin over the arm, leg, or trunk Vision changes and light flashes Hallucinations Tasting a bitter or metallic flavor Complex partial seizure: Confused or dazed and Not be able to respond to questions or direction Absence seizure: Rapid blinking Few seconds of staring into space		Abnormal electroencephalography Positive test without a clinical presentation is called a sub-clinical seizure
Carcinoid syndrome	Hypertensive crisis occurs with malignant carcinoid syndrome. Symptoms include: Severe chest pain Severe headache Confusion and blurred vision Nausea and vomiting Severe anxiety Shortness of breath Seizures Unresponsiveness	Cutaneous flushing Venous telangiectasia Diarrhea Bronchospasm Cardiac valvular lesions (tricuspid incompetence)	High urinary excretion of 5-HIAA High urinary excretion of serotonin High chromogranin concentration(Chromogranin(A, B, and C) are proteins that are stored and released with peptides and amines in a variety of neuroendocrine tissues) CT is recommended for evaluation of all patients with carcinoid tumors.
Migraine headaches	Prodrome: Occurs hours or days before a headache Aura Immediately precedes the headache Pain phase Also known as headache phase Postdrome phase	Conjunctival injection Horner's syndrome[1]  Adie's pupil [2]  Cranial/ cervical muscle tenderness  Bruit at neck and head for clinical signs of an arteriovenous malformation Photosensitivity	CT is indicated in patients with:[1][2] Abnormal physical examination: Increase of headache's frequency Poor coordination Focal neurologic signs Headaches awakening the patient at nigt[3][4] Atypical aura Sudden onset Lasting more than 1 hour Always on the same side With or without visual symptoms Migraine attacks that begin after 50 years of age CT is not indicated in: Patients with a diagnosis of a migraine in accordance with the criteria for migraine Differentiating a migraine from other primary headaches
Drugs	Sympathomimetic drugs that can induce symptoms simulating pheochromocytoma include: High-dose phenylpropanolamine Cocaine Amphetamines Lysergic acid diethylamide (LSD) Phenylcyclidine (PCP) Combination of a monoamine oxidase (MAO) inhibitor and ingestion of tyramine-containing foods.	Disturbed consciousness Nasal septum perforation in cocaine addiction Needle marks on the skin History of antidepressantintake	Urine toxicology screening
Baroreflex failure	Marked and frequent fluctuations in blood pressure, with both high and low readings It is caused by hypofunctioning of baroreflexes that normally buffer blood pressure fluctuations The disorder is usually a result of injury to carotid baroreceptors, with most patients reporting a history of neck irradiation or surgery		Neck CT scan