Available online 24 February 2024

A 34-year-old male, non-smoker, presented with a sudden onset of massive hemoptysis, characterized by bright red blood with a volume of approximately 250 ml. The CT angiography (CTA) revealed a mass in the right lower lobe (Fig. 1A), which was being supplied by a vessel originating from the descending thoracic aorta (Fig. 1B, marked with the green arrow). Additionally, several thickened and twisted vascular shadows were present, including pulmonary arteries (Fig. 1B and Fig. 1C, marked with the

The incidence rate of PS is extremely low, accounting for 0.15% to 6.4% of all congenital lung malformations. Approximately 98% of cases occur in the left lower lobe, which is supplied by the thoracic aorta and drained by the pulmonary veins. Venous drainage into adjacent pulmonary arteries is rarely reported.

This case presented in the right lower lobe, and a CTA examination confirmed that the lesion was being supplied by the descending thoracic aorta, thus confirming the diagnosis. In addition

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