日本小児循環器学会雑誌 Pediatric Cardiology and Cardiac Surgery

Online ISSN: 2187-2988 Print ISSN: 0911-1794
特定非営利活動法人日本小児循環器学会 Japanese Society of Pediatric Cardiology and Cardiac Surgery
〒162-0801東京都新宿区山吹町358-5アカデミーセンター Japanese Society of Pediatric Cardiology and Cardiac Surgery Academy Center, 358-5 Yamabuki-cho, Shinju-ku, Tokyo 162-0801, Japan
Pediatric Cardiology and Cardiac Surgery 33(3): 265-266 (2017)
doi:10.9794/jspccs.33.265

Images in Pediatric and Congenital Heart DiseaseImages in Pediatric and Congenital Heart Disease

A Case of Pericardial Cyst in a Child

Department of Pediatric Cardiology and Nephrology, Kyoto Prefectural University of Medicine ◇ Kyoto, Japan

受付日:2017年1月6日Received: January 6, 2017
受理日:2017年3月30日Accepted: March 30, 2017
発行日:2017年5月1日Published: May 1, 2017
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Key words: pericardial cyst; echocardiography

This report describes the case of a 6-year-old male patient with a pericardial cyst. He was originally referred to our hospital for treatment of idiopathic pulmonary arterial hypertension, without any structural abnormalities of the heart.

An echocardiographic study identified an anechoic lesion with a clear border located outside the right atrium (Fig. 1A). Chest contrast-enhanced computed tomography revealed a 16×14-mm lesion with the CT number of water (Fig. 2). A pericardial cyst or diverticulum of the right atrium was suspected, given the location and distinct visual features of the lesion.

Pediatric Cardiology and Cardiac Surgery 33(3): 265-266 (2017)

Fig. 1 Transthoracic echocardiography

A: An anechoic lesion (arrow) is located outside of the right atrium (RA) with a clear border in the apical four-chamber view. B: Microbubbles injected from the inferior vena cava fill the chambers, but do not flow into the lesion. RA, right atrium; RV, right ventricle; LA, left atrium; LV, left ventricle

Pediatric Cardiology and Cardiac Surgery 33(3): 265-266 (2017)

Fig. 2 Contrast-enhanced computed tomography

The lesion (arrow) measured 16×14 mm, with the CT number of water (5–10 Hounsfield units).

The presence of a cyst was finally confirmed using microbubble echocardiography; this study was added to preplanned cardiac catheterization to evaluate pulmonary arterial hypertension. In this test, the contrast agent injected from the inferior vena cava did not flow into the cavity (Fig. 1B), indicating the lack of communication between the cavity and cardiac structures.

Pericardial cysts are rare mediastinal lesions; they are frequently located at the right cardiophrenic angle. The incidence rate is 1 in 100,000.1) Patients are usually asymptomatic, and the cysts are found incidentally on chest radiographs or echocardiography. They are mostly caused by the failure of fetal lacunae to coalesce into the pericardial coelom. However, the cysts can also occur as sequelae of pericarditis. Our patient had no history of pericarditis; therefore, the cyst was congenital. No etiological relationship was found between the cyst and the idiopathic pulmonary arterial hypertension.

We performed contrast echocardiography to distinguish the cyst from a diverticulum. If the anechoic lesion was a diverticulum, the chamber would be filled with contrast agent, as reported previously.2) Direct injection from the inferior vena cava yielded a vivid image, even with a small amount of contrast medium.

Pericardial cysts are usually benign and do not require surgical resection, which is only considered for symptomatic patients with chest pain or dyspnea. The cyst in our case appeared the same over one year and the patient showed no associated symptoms. However, we plan to continue conservative follow up, because some case reports describe cyst rupture, erosion of the cyst into the right ventricle or superior vena cava, and cardiac tamponade.3)

Conflicts of interest

None.

Note

Supplementary movies are provided online for this article.

引用文献References

1) Nina VJ, Manzano NC, Mendes VG, et al: Giant pericardial cyst: Case report. Rev Bras Cir Cardiovasc 2007; 22: 349–351

2) Sánchez-Brotons JA, López-Pardo FJ, López-Haldón JE, et al: Giant right atrial diverticulum: Utility of contrast-enhanced ultrasound. Rev Esp Cardiol 2013; 66: 222–223

3) Patel J, Park C, Michaels J, et al: Pericardial cyst: Case reports and a literature review. Echocardiography 2004; 21: 269–272

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