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Endocrinology, Diabetes and Metabolism Case Reports 2014

Rare association of acromegaly with left atrial myxoma in Carney's complex due to novel PRKAR1A mutation.

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Shweta Birla
Sameer Aggarwal
Arundhati Sharma
Nikhil Tandon

Sleutelwoorden

Abstract

Carney complex (CNC) is a rare autosomal dominant syndrome characterized by pigmented lesions of the skin and mucosae along with cardiac, endocrine, cutaneous, and neural myxomatous tumors. Mutations in the PRKAR1A gene have been identified in ∼70% of the CNC cases reported worldwide. A 30-year-old male was referred to the endocrinology clinic with suspected acromegaly. He had a history of recurrent atrial myxoma for the past 8 years for which he underwent repeated surgeries. Presently, he complained of having headache, excessive snoring, sweating, and also noticed increase in his shoe size. Evaluation for acromegaly revealed elevated levels of GH in random as well as in suppressed condition. Magnetic resonance imaging scan revealed enlarged sella with microadenoma in the left anterior pituitary. Screening of PRKAR1A gene was carried out for the patient, his parents and siblings who were available and willing to undergo the test. The patient was diagnosed to have the rare CNC syndrome characterized by recurrent atrial myxoma and acromegaly due to a novel 22 bp insertion mutation in PRKAR1A which was predicted to be deleterious by in silico analysis. Screening the available family members revealed the absence of this mutation in them except the elder brother who also tested positive for this mutation. The present study reports on a novel PRKAR1A insertion mutation in a patient with acromegaly and left atrial myxoma in CNC.

CONCLUSIONS

Identification of a novel deleterious PRKAR1A insertion mutation causing CNC.It is important that patients with cardiac myxoma be investigated for presence of endocrine overactivity suggestive of CNC.PRKAR1A mutation analysis should be undertaken in such cases to confirm the diagnosis in the patients as well as first degree relatives.This case highlights an important aspect of diagnosis, clinical course, and management of this rare condition.

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