Lymphoid thymic hyperplasia
A diagnostic
approach to the mediastinal masses. Thymic lymphoid hyperplasia in a 41-year-old woman with clinical diagnosis of myasthenia gravis. Non-contrast-enhanced CT scan shows an enlarged thymic gland (arrows) without mass effect on adjacent structures
nicht verwechseln mit: primäres Lymphom des ThymusLymphoid thymic hyperplasia, also referred to as lymphoid follicular thymic hyperplasia or autoimmune thymitis, is a form of thymic hyperplasia.
Epidemiology
Associations
This condition is most commonly associated with conditions, such as:
- autoimmune conditions
- myasthenia gravis: may be seen in up to 65% of cases
- immunologically-mediated disorders
Pathology
Unlike in true thymic hyperplasia, there is a presence of an increased number of lymphoid follicles.
Radiographic features
CT
Some publications (with small sample sizes) suggest that CT attenuation of lymphoid hyperplasia can be significantly higher than that of true hyperplasia, with the optimal threshold of around 40 HU useful for differentiating lymphoid hyperplasia from true thymic hyperplasia .
Siehe auch:
Assoziationen und Differentialdiagnosen zu lymphofollikuläre Thymushyperplasie:
