King M A, Vrachliotis T G, Bergin C J
Department of Radiology, The Ohio State University Hospitals, Columbus 43210, USA.
J Magn Reson Imaging. 1998 Jul-Aug;8(4):991-3. doi: 10.1002/jmri.1880080431.
We frequently observed a nodular soft-tissue structure in the region of the left atrium anterior to the orifice of the left inferior pulmonary vein on MR scans of the chest. To assess its morphologic characteristics and appearance, chest MR scans obtained in 49 patients were reviewed. ECG-gated conventional spin-echo T1-weighted and fast spin-echo (FSE) T2-weighted sequences were used. The location, morphology, and appearance of this soft-tissue structure was evaluated by two radiologists during one consensus reading. The pseudomass in the region of the left atrium was identified on the T1-weighted images in 25 of 49 patients. The structure was also identified on FSE T2-weighted images in 6 of these patients. On the T1-weighted images, its appearance was either linear (54%) or nodular (46%). In conclusion, a nodular soft-tissue mass anterior to the orifice of the left inferior pulmonary vein into the left atrium is a frequent finding on chest MR scans and should not be confused with an intra-atrial mass. Careful evaluation of the regional anatomy identifies this structure as extraluminal and helps to avoid misinterpretation of an intracardiac mass.
在胸部磁共振成像（MR）扫描中，我们经常在左下肺静脉开口前方的左心房区域观察到一种结节状软组织结构。为了评估其形态特征和表现，我们回顾了49例患者的胸部MR扫描图像。使用了心电图门控的传统自旋回波T1加权序列和快速自旋回波（FSE）T2加权序列。在一次共识读片中，由两位放射科医生评估该软组织结构的位置、形态和表现。49例患者中，25例在T1加权图像上发现左心房区域有假肿块。其中6例患者在FSE T2加权图像上也发现了该结构。在T1加权图像上，其表现为线性（54%）或结节状（46%）。总之，左下肺静脉开口进入左心房前方的结节状软组织肿块在胸部MR扫描中很常见，不应与心房内肿块混淆。仔细评估区域解剖结构可将该结构识别为管腔外结构，有助于避免对心内肿块的误判。
