Type AB, B1, B2, B3, abd type C.
Type A thymoma corresponds to the medullary type of the Marino and Muller-Hermelink classification, type AB to mixed thymoma, type B1 to the predominantly cortical, B2 to the cortical, B3 to well differentiated thymic carcinoma, and type C to the “thymic carcinoma” of the old classification. Thymoma and Thymic Carcinoma. The thymus is a small organ located beneath the breastbone, it is part of the immune system and produces T-lymphocytes-cells which kill viruses and signal B-lymphocytes to make antibodies to fight infection. About 90 percent of tumors that start in the thymus are thymomas. Introduction. Thymoma is a tumor that arises from thymic epithelium or cells with thymic epithelial differentiation. The common form is type AB thymoma, which accounts for approximately 15-43% of thymomas. Type AB thymoma was previously considered to be a non-invasive tumor without recurrence and metastasis. Therefore, it is clinically considered to be benign. From Wikipedia, the free encyclopedia. Thymoma is a tumor originating from the epithelial cells of the thymus. Thymoma is an uncommon tumor, best known for its association with the neuromuscular disorder myasthenia gravis; thymoma is found in 20% of patients with myasthenia gravis. Once diagnosed, thymomas may be removed surgically. In the rare case of a malignant tumor, chemotherapy may be used. ● AB: mixed thymoma; tumor in which foci having the features of type A thymoma are mixed with foci rich in lymphocytes; the segregation of the two patterns can be sharp or indistinct (Am J Surg Pathol 1999;23:955). ● B: bioreactive, resembles thymus in fetus and infant.
http://mmcts.oxfordjournals.org/content/2005/0425/mmcts.2004.000182.full http://www.cancerindex.org/Thymus http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4314039/ https://en.wikipedia.org/wiki/Thymoma http://www.pathologyoutlines.com/topic/mediastinumthymomaclassification.html
thymoma histopathological types