Morphologic and clinico-pathologic features of XXXX .

@entity5 @entity1893 @entity704 @entity978
A total of 37 thymic @entity5 was studied out of which 29 proved to be of epithelial origin. @entity704 may be accompanied by a minimal, marked or an overwhelming lymphoid reaction, pointing to the degree of the cellular defensive mechanism. According to the findings, two main types of @entity704 with minimal lymphoid reaction (light and dark cell types) can be distinguished. All the 7 light cell thymomas with minimal lymphoid reaction proved to be malignant in their clinical course. @entity704 of light cell origin with marked lymphoid reaction may be clinically benign or malignant. @entity704 with overwhelming lymphoid reaction were clinically benign. The clinical behavior of the dark cell thymomas was benign. The dark cell thymomas could be divided into subgroups with solid, lacunar and spindle cell forms. Three @entity1893 were observed. The T cell origin of one of these @entity5 was demonstrated immunologically. All the five cases of @entity978 were morphologically identical to the modular sclerotic form of lymphogranulomatosis.
