Left atrial septal pouch thrombus: An unusual cause of an embolic stroke

Key Clinical Message Left‐atrial septal pouch (LASP) is a newly described anatomical variant caused by incomplete fusion of the septa primum and secundum. This case visualizes LASP as a potential nidus for blood stasis and cardiac embolism and highlights the need for consideration of TEE in the work up of cryptogenic stroke. Application of transesophageal echocardiography to detect a left atrial septal pouch thrombus as an unusual cause of cryptogenic stroke.