F 71, A welldemarcated thymic mass, showing multiple tan coloured nodules of various size separated

1
F 71, A well-demarcated thymic mass, showing
multiple tan coloured nodules of various size
separated by fibrous bands.
2
A
B
3
B
A
4
B
A
Type AB thymoma is an organotypical thymic
epithelial neoplasm composed of a mixture of a
lymphocyte-poor type A thymoma component and a
more lymphocyte-rich type B-like component.
5
A
Lymphocyte-poor type A thymoma component
composed of bland spindle/oval epithelial tumor
cells with few lymphocytes.
6
B
The tumor cells in the type B-like component are
composed predominantly of small round, oval or
spindle pale nuclei showing dispersed chromatin
and inconspicuous nucleoli, and smaller and paler
than those of B1 or B2 thymomas.
7
A
B