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Computed tomography appearance of idiopathic aneurysm of the azygos vein
1Department of Medical Imaging, Sunnybrook Health Science Centre, North York, Ont.
Abstract:
True idiopathic aneurysm of the azygos vein is a rarely described abnormality. The authors present a case of this anomaly in a 70-year-old woman with a history of rectal carcinoma. The aneurysm was found incidentally on computed tomography, performed to characterize the appearance of a lung nodule. The aneurysm decompressed when the patient was upright. The effects of respiratory and postural manoeuvres on the lesion are discussed and the computed tomography appearance is described.