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Logo of thijTexas Heart Institute JournalSee also Cardiovascular Diseases Journal in PMCSubscribeSubmissionsTHI Journal Website
 
Tex Heart Inst J. 2010; 37(2): 244–245.
PMCID: PMC2851441

Giant Pulmonary Artery Aneurysm Secondary to Primary Pulmonary Hypertension

Raymond F. Stainback, MD, Section Editor
Department of Adult Cardiology, Texas Heart Institute at St. Luke's Episcopal Hospital, 6624 Fannin St., Suite 2480, Houston, TX 77030

A 19-year-old woman with a 2-year history of progressive dyspnea, dull aching chest pain, and hoarseness was referred to our institution for clinical evaluation. Her general physical examination was normal. Auscultation revealed a palpable systolic impulse in the 2nd left anterior intercostal space and a grade 2/6 systolic murmur at the lower left sternal border. Her chest radiograph showed cardiomegaly, together with a hugely dilated main pulmonary artery (PA) and bilateral PA enlargement (Fig. 1) with peripheral pruning. Electrocardiography suggested right ventricular (RV) hypertrophy with strain. Later, transthoracic echocardiography showed dilated right atrium and RV with aneurysmally dilated main PA (4.6 cm) and right (3.4 cm) and left (4 cm) PA branches (Fig. 2A). The pulmonary valve was normal. She had mild tricuspid regurgitation with pulmonary hypertension (PA systolic pressure, 80 mmHg) and RV dysfunction. The left-sided chambers were normal, with normal left ventricular function. There was no echocardiographic evidence of congenital or valvular heart disease. In order to evaluate the lesions of the pulmonary vasculature, 64-slice computed tomographic angiography was performed; it confirmed the aneurysm, which affected the main PA (4.8 cm) and bilateral branches (right PA, 4.4 cm; left PA, 4.6 cm), with blunting of the lobar, segmental, and sub-segmental PA radicles (Fig. 3). The bilateral peripheral lung fields were mosaic patterned and hypoperfused, with marked attenuation of the computed tomographic image, possibly due to trapped air secondary to pressure on the bronchi by the aneurysm (Fig. 2B). There was no evidence of thrombus within the pulmonary vasculature.

figure 26FF1
Fig. 1 Chest radiograph (posteroanterior view) shows cardiomegaly, dilated main pulmonary artery, and right pulmonary artery with peripheral pruning.
figure 26FF2
Fig. 2 A) Transthoracic echocardiography (basal short-axis view) shows dilated main pulmonary artery (MPA), right pulmonary artery (RPA), and left pulmonary artery (LPA). B) Multislice contrast computed tomographic scan of the thorax shows dilated pulmonary ...
figure 26FF3
Fig. 3 Multislice computed tomographic scans (volume-rendered images) show dilated main pulmonary artery and its branches. A) Anterior view. B) Posterior view, showing also the peripheral pruning.

The patient was investigated for causes of the pulmonary hypertension that possibly were associated with other clinical conditions. It was decided to administer a calcium-channel blocker, an anticoagulant, and sildenafil citrate. There was dramatic improvement in her signs and symptoms upon follow-up.

Comment

Pulmonary artery aneurysm—defined as PA dilation greater than 4 cm1—is a rare condition, regardless of cause. It may develop as a result of congenital heart disease, infection, vasculitis, arteriovenous communication, trauma, or connective-tissue disease.2 The most common cause (in approximately 50% of cases) is congenital heart disease productive of pulmonary hypertension. We present a highly unusual phenomenon: giant pulmonary artery aneurysm secondary to pulmonary hypertension in a young woman.

Chest radiography can provide the initial clue indicative of PA aneurysm. Echocardiography is useful both for confirmation of diagnosis and for ascertainment of possible cause. Multislice computed tomography of the thorax provides excellent 3-dimensional images that show the relationships of mediastinal and thoracic structures to the aneurysm.

Supplementary Material

Video for Fig. 2A:

Footnotes

Address for reprints: Nagaraja Moorthy, MD, Department of Cardiology, Sri Jayadeva Institute of Cardiovascular Sciences and Research, 9th block Jayanagar, Bangalore – 560069, Karnataka, India

E-mail: moc.oohay@yhtroom;f5000x#&jaraganrd

References

1. Chetty KG, McGovern J, Mahutte CK. Hilar mass in a patient with chest pain. Chest 1996;109(6):1643–4. [PubMed]
2. Mann P, Seriki D, Dodds PA. Embolism of an idiopathic pulmonary artery aneurysm. Heart 2002;87(2):135. [PMC free article] [PubMed]

Articles from Texas Heart Institute Journal are provided here courtesy of Texas Heart Institute