With respect to phaeochromocytoma:
a) What is the usual mode of clinical presentation? (30% marks)
b) What biochemical tests and imaging can be performed to make the diagnosis?
c) Outline the key features of preoperative preparation and postoperative management.
a) What is the usual mode of clinical presentation
Symptomatic patient. Classic triad of symptoms consists of episodic headache, sweating, and tachycardia. Sustained or paroxysmal hypertension and less commonly visual blurring, papilledema, weight loss, polyuria, polydipsia and cardiomyopathy.
Incidental adrenal mass
Family history in patients with familial disease.
b) What biochemical tests and imaging can be performed to make the diagnosis
24-hour urinary excretion of catecholamines and total metanephrines.
Plasma fractionated catecholamines (dopamine, norepinephrine, and epinephrine) and fractionated metanephrines (metanephrine and normetanephrine)
CT or MRI of abdomen and pelvis Scintigraphy and PET scanning
c) Outline the key features of preoperative preparation and postoperative management
Combined alpha and beta-adrenergic blockade
Calcium channel blockers
Metyrosine which inhibits catecholamine synthesis
Post-operative management in ICU
Hypertensive crises or arrhythmias common complications
Patients who have bilateral adrenalectomies will require steroid cover
"What is the usual mode of clinical presentation", they ask. Depending on what one means by mode, the answer may be "private car, ambulance, or fixed wing aircraft". Judging by the college answer, what they wanted was something about the clinical manifestations of a symptomatic patient, as well as the various ways in which an incidental phaechromocytoma may be discovered. About 10% of them are found on random CTs and MRIs which are done for other reasons (Kudva et al, 1999).
There is also a possibility that one has their phaemochromocytoma diagnosed in the course of intentional phaeochromocytoma screening, because of some some sot of familial predisposition. There is also a well-known association between thyroid carcinoma and phaeochromocytoma - investigators in 1961 concluded that "the incidence of carcinoma of the thyroid gland is increased far beyond expectation based on chance concurrence".
What biochemical tests and imaging can be performed to make the diagnosis?
Investigations for phaeochromocytoma should include the following:
Overall, one's management should be guided by some sort of interational consensus guidelines, which take the following shape:
Outline the key features of preoperative preparation and postoperative management
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