23 December 2025
: Case report 
Platypnea-Orthodeoxia Syndrome Associated With a Right-to-Left Cardiac Shunt Detected by Lung Perfusion Scintigraphy
Challenging differential diagnosis, Rare disease
Yusuke Nakano
ABCDEFG 1,2*, Hirohiko Ando CDE 1, Akinori Satake DE 3, Reiji Goto DE 1, Kentaro Mukai DE 1, Tetsuya Amano CDE 1
DOI: 10.12659/AJCR.949642
Am J Case Rep 2025; 26:e949642
Figure 1 Chest imaging findings. (A) Chest X-ray showing mild cardiomegaly and dilation of the right pulmonary hilum. (B) Contrast-enhanced chest CT scan demonstrating compression of the right atrium by an enlarged ascending aorta (red arrow). CT – computed tomography; Ao – aorta; RA – right atrium.