The discovery of a mediastinal mass is usually alarming. A benign organ, thymus is a bi-lobed encapsulated structure located
in the anterior mediastinum, anterior to the great vessels. It is usually prominent in young children with the classical
morphological appearance of a nautical sail, confirming its normal position [1-3]. We present a child with an x-ray of a
thymus mimicking a mediastinal mass which was located in the inferior aspect of the heart.