Items tagged “thymus”
9 results found
Article
Thymus
The thymus (plural: thymi) is a lymphoid organ in the anterior mediastinum responsible for the production and maturation of T-cells until puberty. It is a vital component of the immune system and plays a role in prevention of cancer 12, infection and autoimmunity 11.
Gross anatomy
It is relati...
Article
Thymic epithelial tumors
Thymic epithelial tumors are rare tumors arising from thymus in anterior mediastinum of middle age patients, these tumors encompass thymomas, invasive thymomas and thymic carcinoma. Despite their relative rarity, they are the most common primary neoplasm of the thymus and anterosuperior mediasti...
Article
Thymolipoma
Thymolipoma is a rare, benign anterior mediastinal mass of thymic origin, containing both thymic and mature adipose tissue.
Epidemiology
Thymolipomas comprise ~5% (range 2-9%) of all thymic neoplasms, but are less common than a mediastinal lipoma of non-thymic origin. There is no recognized s...
Article
Primary neoplasms of the thymus
Although primary tumors of the thymus are rare, they are the most common causes of a neoplasm of the anterosuperior mediastinum 1.
thymoma (staging)
one-third are benign
two-thirds are malignant
invasive thymoma (most)
thymic carcinoma (rare)
thymolipoma/thymoliposarcoma
thymic cyst
cong...
Article
WHO classification of thymic tumors
The World Health Organization (WHO) classification of tumors of the thymus is a component of the WHO classification of thoracic tumors, which was published in its 5th edition in 2021 1. It is a pathological classification of thymic epithelial tumors, including thymomas, thymic carcinomas, and ne...
Article
Thymic rebound hyperplasia
Thymic rebound hyperplasia is considered a form of true thymic hyperplasia.
Pathology
In periods of bodily stress the thymus may acutely shrink to 40% of its original volume (depending on the severity and duration of the stress). During the recovery phase it can grow back to its original size ...
Article
Retrocaval thymus
Retrocaval thymus is defined as an ectopic location of thymus between the superior vena cava and great arteries. It is a rare finding and mostly asymptomatic.
Radiographic features
Plain radiograph
may mimic mediastinal mass or right upper lobe collapse 2
CT and MRI
soft tissue that is cons...
Article
Thymic notch sign
The thymic notch sign represents the normal thymus in a newborn on a frontal chest radiograph. Interruption of the cardiac silhouette forms a notch, which may be seen on either side, but more frequently is seen on the left side.
See also
thymic sail sign
thymic wave sign
Article
Thymic sail sign
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. This sign should not be confused with the spinnaker sail ...
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