Congenital Absence of the Left Pulmonary Artery Associated With Right-Sided Aortic Arch Presenting as Hemoptysis in an Adult: A Case Report.

Congenital unilateral absence of the pulmonary artery is a rare vascular anomaly that may remain undiagnosed until adulthood. Patients can present with unexplained hemoptysis, recurrent respiratory infections, or pulmonary hypertension. Contrast-enhanced CT plays a crucial role in diagnosis, evaluation of collateral circulation, and guiding appropriate therapeutic management.