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A Tense Case-Carney’s Triad

November 26, 2004

A rare differential diagnosis for secondary hypertension is Carney’s triad-extra-adrenal paraganglioma, gastric leiomyosarcoma, pulmonary chondroma.1

CASE HISTORY

A man aged 46 with known refractory hypertension was referred for investigation after a year of occipital headaches on exertion and six months of increasing lethargy and fatigue. Associated symptoms included drenching night sweats, paraesthesiac in his fingers, cold peripheries, a decreasing libido, and weight loss of 7 kg over the past four months. Current treatment was felodipine 10 mg and lisinopril 10 mg daily.

Blood pressure on admission was 162/102 mmHg; routine blood indices were all normal apart from mildly deranged liver function tests. 24-hour urinary excretion of catecholamines and their metabolites was measured by high-performance liquid chromatography with solid phase extraction while the patient was on the original doses of felodipine and lisinopril. Norepinephrine was 20 000 nmol/ 24 h (normal range 0-500), epinephrine 24 nmol/24 h (0-100), normetanephrine 25.2 mol/24 h (0.1-3.3), dopamine 5480 nmol/24 h (0- 3000) and vanillylmandelic acid 114 mol/24 h (

Figure 1 Chest radiograph showing pulmonary chondroma in left upper zone

COMMENT

The diagnosis of Carney’s triad, which was characterized in 1977, requires at least two of three components-gastric leiomyosarcoma, extra-adrenal paraganglioma and pulmonary chondroma1. In the latest review, by Carney in 1999, cases with two or three of the elements had been reported in 79 patients, 84% of them female.2 The neoplasms can appear at any age and in any sequence. 78% of patients had two tumours on presentation, the most frequent combination being gastric leiomyosarcoma and pulmonary chondroma.2 To date, only two patients have shown a complete Carney’s triad at first presentation.3 Typical early features are chronic iron deficiency anaemia or gastrointestinal bleeding.4 Only 4% of patients are detected through hypertension secondary to a catecholamine-secreting extra-adrenal paraganglioma.2 Carney’s triad needs to be thought of in patients with such tumours. The pulmonary chondromas have high calcium content and are often picked up incidentally on chest radiography. These are benign and resection is unnecessary.5 Gastric leiomyosarcomas, by contrast, are potentially fatal. Gastroscopy with biopsy is the investigation of choice. Early operation is desirable since this tumour is insensitive to chemotherapy and radiotherapy.6 A functioning extra-adrenal paraganglioma can be picked up by measurement of urinary catecholamines and the tumour is often delineated by CT, ultrasonography or MRI. Additional information can be had from iodine-123-meta-iodobenzylguanidine scanning (preferably not performed after treatment with intravenous phenoxybenzamine or beta blockade) or from indium-111-octreotide scanning.5 Again, surgery is the best treatment, to prevent life- threatening dysrrhythmias, hypertensive crises and severe end-organ damage.4

Figure 2 CT showing an irregularly shaped left para-aortic mass with central ring calcification (a) and slight enhancement following contrast (b)

In the patient reported here, the detection of a pulmonary chondroma at age 26 should ideally have triggered further investigations at the time. The paraganglioma might then have been more amenable to surgical intervention. HE will now require lifelong treatment together with follow-up to monitor the status of his paraganglioma and exclude the development of gastric leiomyosarcoma.

REFERENCES

1 Carney JA, Sheps SG, Go VLW, Gordon H. The triad of gastric leiomyosarcomas, functioning extra-adrenal paraganglioma and pulmonary chondroma. N Engl J Med 1977;296:1517-18

2 Carney JA. Gastric stromal sarcoma, pulmonary chondroma, and extra-adrenal paraganglioma (Carney’s triad): natural history, adrenocortical component, and possible familial occurrence. Mayo Clinic hoc 1999;74:543-52

3 Wales PW, Drab SA, Kim PC. An unusual case of complete Carney’s triad in a 14-year-old boy. J Pediatr Surg 2002;37:1228-31

4 Valverde K, Henderson M, Smith R, Tallett S, Chan H. Typical and atypical Carney’s triad presenting with malignant hypertension and papilledema. J Pediatr Hematol Oncol 2001;23:519-24

5 Margulies KB, Sheps SG. Carney’s triad: guidelines for management. Mayo Clinic Proc 1988;63:496-502

6 Carney JA. The triad of gastric epithelioid leiomyosarcoma, pulmonary chondroma, and functioning extra-adrenal paraganglioma: a five-year review. Medicine (Baltimore) 1983;62:159-69

John C Bladen MB BSc1 Mariya Moosajee MB BSc1 J H Duncan Bassett PhD MRCP2

J R Soc Med 2004;97:540-541

1 Department of Medicine, East Surrey Hospital, Redhill, Surrey RH1 5RH; 2 Molecular Endocrinology Group, Division of Investigative Science, Faculty of Medicine, Imperial College London, Hammersmith Hospital, London W12 0NN, UK

Correspondence to: Dr J C Bladen

E-mail: john_bladen@hotmail.com

Copyright Royal Society of Medicine Press Ltd. Nov 2004




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