Rebound hyperplasia of the thymus reflects regrowth of the thymus after temporary atrophy of the gland, which occurs during a period of illness or physical stress. It occurs mainly in children and adolescents. It is very uncommon in adults and has been des- cribed in only a few reports following chemo-therapy (1,2).
What causes thymic hyperplasia?
Thymic hyperplasia is an increase in size and weight of a thymus gland that is otherwise normal. It usually is a rebound phenomenon after atrophy caused by corticosteroids or chemotherapy, and it occurs several months after resolution of the cause of atrophy. Occasionally, it may result from hyperthyroidism.
Is thymic tissue normal?
Although thymic lymphoid hyperplasia usually appears as a normal thymus at conventional radiography, at CT it may appear normal (45% of cases), enlarged (35%), or as a focal thymic mass (20%) (24).
What happens if the thymus is removed?
After puberty, the thymus does not play an important role and removing it does not result in any ill-effects or any problems with the immune system.
What are the symptoms of an enlarged thymus?
Swelling in the face, neck, and upper chest, sometimes with a bluish color. Swelling of the visible veins in this part of the body. Headaches. Feeling dizzy or light-headed….Symptoms caused by the tumor
- Shortness of breath.
- Cough (which may bring up bloody sputum)
- Chest pain.
- Trouble swallowing.
- Loss of appetite.
- Weight loss.
What happens if the thymus gland is damaged?
Symptoms may include shortness of breath, cough (which may bring up bloody sputum), chest pain, trouble swallowing, loss of appetite and weight loss, headaches, swelling of head face or neck, a bluish color to the skin and dizziness, according to the American Cancer Society.
What kind of doctor treats thymus gland?
Who treats thymus cancer? Your health care team may include: Thoracic surgeon: a surgeon who specializes in chest surgery. Radiation oncologist: a doctor who treats cancer with radiation therapy.
Does thymic hyperplasia go away?
Thymic hyperplasia by itself does not require any treatment, but the associated conditions, such as hyperthyroidism, may. In patients with MG and thymic hyperplasia, we will probably recommend surgery to remove the thymus gland.
What are the symptoms of thymic hyperplasia?
Thymic hyperplasia can compress these structures, causing the following symptoms:
- Shortness of breath.
- Dysphagia.
- Cough.
- Loss of appetite.
- Weight loss.
- Chest pain.
What does the thymus do?
The thymus gland is in the chest, between the lungs and behind the breastbone (sternum). It is just in front of, and above, the heart. The thymus makes white blood cells called T lymphocytes (also called T cells). These are an important part of the body’s immune system, which helps us to fight infection.
When does thymic tissue disappear?
age 75
Once you reach puberty, the thymus starts to slowly shrink and become replaced by fat. By age 75, the thymus is little more than fatty tissue. Fortunately, the thymus produces all of your T cells by the time you reach puberty.
What is the pathophysiology of thymic rebound hyperplasia?
It gradually involutes with age and may acutely shrink during periods of bodily stress. During the recovery period, it grows back to its original size or even larger, a phenomenon known as thymic rebound hyperplasia. These anatomic variations and dynamic changes appear to be the main source of confusion with pathologic conditions.
What is the role of Radiology in the workup of thymus?
Familiarity with the embryology, anatomy, and dynamic physiology of the thymus is essential to avoid unnecessary imaging or invasive procedures. Radiologists play a major role in differentiating normal thymic variants, ectopic thymic tissue, and nonneoplastic thymic conditions such as rebound hyperplasia from neoplastic conditions.
What is the normal thickness of the thymus?
Baron et al (, 14) analyzed 154 mediastinal CT scans and reported that the mean thickness of a normal thymus decreased with advancing age from 1.1 cm (standard deviation, 0.4 cm) for the 6–19-year age group to 0.5 cm (standard deviation, 0.27 cm) for patients over age 50 years.
Which radiographic findings are characteristic of thymic lymphoid hyperplasia (HL)?
Although thymic lymphoid hyperplasia usually appears as a normal thymus at conventional radiography, at CT it may appear normal (45% of cases), enlarged (35%), or as a focal thymic mass (20%) (24).
