Multimodality Imaging of Sinus Venosus Atrial Septal Defect: A Challenging Diagnosis in Adults.

• SVASD should be suspected in cases of unexplained RV volume overload. • Direct visualization of SVASD with TTE is difficult in adults compared with children. • TEE is helpful for diagnosing SVASD and associated pulmonary venous abnormalities. • Multimodal imaging techniques offer incremental value in the workup of SVASD.