Pulmonary Embolism. (a) Axial CTA chest demonstrating large central pulmonary embolism(arrow) in the right main pulmonary artery (b) Coronal CTA chest demonstrating large central pulmonary embolism (arrow) in the right main pulmonary artery (c) Coronal CTA chest demonstrating right lower lobe pulmonary infarct (arrow). Pulmonary embolism: An abdominal pain masquerader. Gantner J, Keffeler JE, Derr C - Journal of emergencies, trauma, and shock (2013). Not Altered. CC.