Related Experiment Video
Updated: Feb 23, 2026

Cardiac Magnetic Resonance for the Evaluation of Suspected Cardiac Thrombus: Conventional and Emerging Techniques
Published on: June 11, 2019
Left atrial thrombus due to transseptal catheterization simulating solid mass of right atrium
Jae Hang Lee1, Ji-Hyun Kim2, Jin-Ho Choi3
1Department of thoracic and cardiovascular surgery, Dongguk University Ilsan Hospital, Siksa-dong, Ilsandong-gu, Goyang-si, Gyeonggi-do, 410-773, South Korea. truemed@hotmail.com.
Background:
Transseptal catheterization has been popularized through ongoing advances in percutaneous procedures, but related complications are known to occur.
Case Presentation:
A 72 year-old female was admitted with left-sided weakness. In the course of various exams, a rounded and smooth-surfaced solid mass of right atrium was identified. However, a septal aneurysm associated with left atrial mural thrombus was evident intraoperatively. Given that percutaneous transseptal mitral valvotomy had been done 7 years previously, a causal relationship is likely.
Conclusions:
Prior cardiac intervention should be considered in patients presenting with mass lesions of interatrial septum.
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Pulmonary Embolism I: Introduction

