Sandbox: Ifeoma

• Patent foramen ovale may be classified anatomically according to the shape of the tunnel using a real time 3-dimensional transesophageal echocardiography (RT3D-TEE). It is classified based on the minimum overlap of the septum primum and septum secundum under valsalva maneuver.
• The table below shows the different tunnel types:

Patent Foramen Ovale Tunnel Type	Description
Type 1	Complete overlap
Type 2	Partial overlap (≧ 4 mm)
Type 3	Little or zero overlap (< 3 mm)

Diseases	Anatomy	Shunt	Symptoms	Physical Education	Diagnosis	Treatment	Complications
Type 1	Complete overlap
Type 2	Partial overlap (≧ 4 mm)
Type 3	Little or zero overlap (< 3 mm)