Pheochromocytoma
Pheochromocytoma is a rare neuroendocrine tumor arising from the chromaffin cells of the adrenal medulla. It releases surges of catecholamines (norepinephrine, epinephrine and dopamine). The classic clinical triad is episodic high blood pressure, severe headache and drenching sweats (diaphoresis), often accompanied by obvious skin signs such as sudden pallor or reactive flushing.
About 30–40% of pheochromocytomas are linked to autosomal dominant inherited syndromes (such as NF1, MEN2 and VHL). At Haute-Derma, recognizing the skin signs of these associated syndromes is key to early diagnosis, guiding biochemical metanephrine testing and coordinating multidisciplinary care before surgery and any cosmetic treatment.
Genetic Basis and Effects on Blood Vessels and Skin
In pheochromocytoma, catecholamines act powerfully on the blood vessels and glands of the skin:
- How Catecholamines Cause Vasoconstriction and Sweating:
- Norepinephrine: Stimulates alpha-1 adrenergic receptors on the smooth muscle of peripheral blood vessels, causing intense vasoconstriction. The result is pale skin, cold hands and feet and a sharp spike in blood pressure.
- Epinephrine: Stimulates beta-1 and beta-2 adrenergic receptors, raising the heart rate and basal metabolic rate, and directly drives the eccrine sweat glands through the sympathetic nervous system, causing episodes of heavy, full-body sweating.
- Reactive Flushing: After repeated bouts of severe vasoconstriction, compensatory vasodilation or the sudden release of vasoactive peptides (such as VIP and substance P) produces waves of flushing over the face and chest.
- Inherited Gene Mutations: Pheochromocytoma often occurs as part of an inherited syndrome, involving mutations in RET (MEN2A/MEN2B), VHL (von Hippel-Lindau disease), NF1 (neurofibromatosis type 1) or the genes encoding succinate dehydrogenase (SDHB, SDHD).
Inherited Syndromes Linked to Pheochromocytoma and Their Skin Signs
| Inherited Syndrome | Mutated Gene | Characteristic Skin and Mucosal Findings |
|---|---|---|
| MEN 2A | RET (proto-oncogene) | Lichen amyloidosis on the back/shoulders (itchy, hyperpigmented papules in a rippled pattern) |
| MEN 2B | RET (M918T mutation) | Mucosal neuromas on the lips and tongue (thick lips, bumpy tongue), marfanoid body habitus |
| Neurofibromatosis Type 1 (NF1) | NF1 (neurofibromin) | More than 6 café-au-lait macules (CALMs), axillary/groin freckling (Crowe sign), cutaneous neurofibromas |
| Von Hippel-Lindau Disease (VHL) | VHL (tumor suppressor) | Benign vascular tumors (hemangioblastomas) of the retina and central nervous system; vascular skin lesions |
Biochemical Screening and Imaging at Haute-Derma
- Blood and 24-Hour Urine Biochemistry
- Plasma free metanephrines or 24-hour urine fractionated metanephrines (sensitivity > 97%). This is the gold-standard test for confirming excess catecholamine production.
- Skin Examination and Advanced Dermoscopy
- We look for clinical clues to an inherited syndrome: café-au-lait macules, cutaneous neurofibromas, mucosal neuromas of the lips or tongue, or lichen amyloidosis on the back.
- Dermoscopy helps distinguish pigmented lesions from peripheral vascular lesions.
- Cross-Sectional Imaging and Nuclear Medicine
- Abdominal CT or MRI of the adrenal glands to locate the tumor and measure its size.
- 123I-MIBG scintigraphy or PET-CT (68Ga-DOTATATE) when an extra-adrenal tumor (paraganglioma) or metastatic disease is suspected.
Management and Treatment Plan at Haute-Derma
Managing pheochromocytoma requires strict adherence to medical preparation before surgery, followed by skin rehabilitation once the cause has been removed:
Medical Preparation and Surgery
- Alpha blockade must come before beta blockade:
- Treatment starts with an alpha-adrenergic blocker (phenoxybenzamine or doxazosin) at least 10–14 days before surgery to lower blood pressure and expand the chronically constricted blood volume.
- NEVER start a beta blocker on its own first: Blocking beta receptors without prior alpha blockade removes beta-2 vasodilation, leaving alpha-1 vasoconstriction unopposed and potentially triggering a fatal hypertensive crisis.
- Adrenalectomy: The tumor is removed laparoscopically once blood pressure and circulating volume are stable.
Managing Skin Symptoms and Cosmetic Recovery at Haute-Derma
Once the tumor has been removed and hormone levels are back to normal, Haute-Derma treats any remaining skin concerns:
- Botulinum toxin A for persistent excessive sweating: Microinjections of botulinum toxin A (100–200 units) into the palms, underarms or forehead block acetylcholine release at the sympathetic nerve endings that supply the eccrine sweat glands.
- Light-Based Treatment for Pigment and Blood Vessels:
- Inherited pigmented birthmarks (CALMs in NF1): Picosecond laser at 532 nm / 1064 nm breaks up clusters of accumulated melanosomes.
- Facial telangiectasias: Long-pulse 1064 nm Nd:YAG laser or IPL with a vascular filter coagulates superficial dilated vessels that develop after long periods of alternating constriction and dilation.
