What is a sail sign thymus?
The thymic sail sign represents a triangular-shaped inferior margin of the normal thymus seen on a neonatal frontal chest radiograph. It is more commonly seen on the right side, but can also be bilateral. It is seen in 3-15% of all cases.
What causes a sail sign in the thoracic cavity?
On a chest X-ray, the sail sign is a radiologic sign that suggests left lower lobe collapse. In children, however, a sail sign could be normal, reflecting the shadow of the thymus. The thymic sail sign or spinnaker-sail sign is due to elevation of the thymic lobes in the setting of pneumomediastinum.
What is a sail sign on xray?
The sail sign on an elbow radiograph, also known as the anterior fat pad sign, describes the elevation of the anterior fat pad to create a silhouette similar to a billowing spinnaker sail from a boat. It indicates the presence of an elbow joint effusion.
What is thymic shadow?
Widening of the superior mediastinal shadow by a prominent thymus is commonly seen on the frontal film of infants. A large thymus is no longer accepted as a cause of respiratory distress or other symptoms, and its presence is probably indicative of normalcy rather than pathology (2).
Is Sail sign normal?
The thymic sail sign is a normal finding in infants and should not be confused with the “spinnaker-sail sign” where the thymic lobe shadow is laterally and superiorly displaced due to pneumomediastinum, as though an actual boat sail blown by strong wind [1].
What is a fat pad sign?
The posterior fat pad sign is the visualization of a lucent crescent of fat located in the olecranon fossa on a true lateral view of an elbow joint with the elbow flexed at a right angle indicating an elbow joint effusion.
What age does thymic shadow disappear?
Gross anatomy It gradually involutes with age (between 20 and 60 years) with progressive fatty replacement of the cellular components (15 g at 60 years of age). Fatty replacement starts at puberty and occurs more rapidly in males than females. There can be a wide variation in size between patients 3.
When does the thymic shadow disappear?
lead to thymic atrophy. The thymus decreases in size by 1-3 years old. By 4 years of age it can only be seen on a CXR in 2% of patients, but it is usually seen on CT of the chest in patients less than 20 years old.
What is a fatty elbow?
Lipoma. A lipoma is a benign fatty tissue growth. Lipomas can grow on your elbow and increase to a size that can affect movement. Usually a lipoma doesn’t require treatment. However, if the bump on your elbow is growing or painful, your doctor might suggest surgery or liposuction to remove it.