Left sided pleural effusion, an unusual presentation of a detrimental pathology

Abstract We report a rare presentation of a left-sided painless pleural effusion, initially suspected to be due to malignancy or tuberculosis based on clinical history and preliminary findings. However, detailed evaluation and imaging revealed the underlying etiology to be a dissecting aortic aneurysm. This case highlights the importance of considering vascular causes in the differential diagnosis of unexplained pleural effusions, particularly when classical symptoms are absent. Early identification of such atypical presentations is crucial for timely intervention and improved patient outcomes.