Inferior sinus venosus atrial septal defect

Area of Science:

• Cardiology
• Medical Imaging
• Congenital Heart Disease

Background:

• Sinus venosus defects are uncommon congenital heart anomalies.
• Inferior vena cava (IVC) type sinus venosus defects are a rare subtype.
• Accurate diagnosis is essential for appropriate management.

Observation:

• A case of IVC type sinus venosus defect is presented.
• Transthoracic echocardiography (TTE) may not reliably detect IVC type sinus venosus defects.
• Transesophageal echocardiography (TEE) offers improved visualization.

Findings:

• IVC type sinus venosus defects require a meticulous search during TEE.
• Unlike superior sinus venosus defects, inferior variants are less conspicuous.
• Unexplained right ventricular volume overload on TTE warrants further investigation.

Implications:

• TEE should be considered for patients with unexplained right ventricular volume overload.
• Early detection of IVC type sinus venosus defects can prevent complications.
• This highlights the importance of advanced echocardiographic techniques in diagnosing complex congenital heart disease.