Secondary carcinoma involving the left atrium

Area of Science:

• Cardiology
• Oncology
• Pathology

Background:

• Metastatic cancer involvement of the heart is relatively common.
• Endocardial surface involvement by metastatic tumors is rare.
• Tumor obstruction of cardiac blood flow is an unusual presentation.

Observation:

• A patient presented with a clinical picture mimicking atrial myxomas.
• The patient had a large cell, undifferentiated carcinoma of the lung.
• The tumor migrated down the pulmonary vein into the left atrium.

Findings:

• The lung carcinoma successfully invaded the endocardial surface of the left atrium.
• The tumor caused intermittent obstruction of blood flow, presenting as a ball-valve effect.
• This represents an unusual metastatic pathway and cardiac complication.

Implications:

• Highlights the importance of considering metastatic disease in cardiac masses.
• Underscores the potential for unusual tumor migration and obstruction.
• Emphasizes the need for thorough diagnostic workup in cases with atypical cardiac symptoms.