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Related Experiment Videos

A left atrial pseudomass: potential pitfall at thoracic MR imaging

M A King1, T G Vrachliotis, C J Bergin

  • 1Department of Radiology, The Ohio State University Hospitals, Columbus 43210, USA. king-2@medctr.ohio-state.edu

Journal of Magnetic Resonance Imaging : JMRI
|August 14, 1998
PubMed
Summary

A common finding on chest MR scans is a soft-tissue structure near the left atrium, anterior to the left inferior pulmonary vein. This pseudomass should not be mistaken for an actual intra-atrial mass.

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Area of Science:

  • Radiology
  • Cardiovascular Imaging
  • Medical Diagnostics

Background:

  • A nodular soft-tissue structure is frequently observed anterior to the left inferior pulmonary vein orifice on chest MR scans.
  • This finding can be mistaken for an intra-atrial mass, necessitating further investigation into its characteristics.

Purpose of the Study:

  • To assess the morphologic characteristics and appearance of this soft-tissue structure.
  • To differentiate this common finding from actual intra-atrial masses.

Main Methods:

  • Review of chest MR scans from 49 patients.
  • Utilized ECG-gated conventional spin-echo T1-weighted and fast spin-echo (FSE) T2-weighted sequences.
  • Consensus reading by two radiologists to evaluate location, morphology, and appearance.

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Main Results:

  • The pseudomass was identified in 25 of 49 patients on T1-weighted images.
  • It appeared linear in 54% and nodular in 46% of cases on T1-weighted images.
  • The structure was identified on FSE T2-weighted images in 6 patients.

Conclusions:

  • A nodular soft-tissue mass anterior to the left inferior pulmonary vein orifice is a frequent finding on chest MR scans.
  • This structure is extraluminal and should not be confused with an intra-atrial mass.
  • Careful evaluation of regional anatomy is crucial to avoid misinterpretation.