based on their degree of differentiation of the epithelial tumour component and on the proportion of non tumour associated lymphocytes , 4 histological types were defined : 1 ) spindle-or-oval-cell thymomas where tumour cells reminiscent of normal involutive thymic cells were of small size with a tendency to form clusters , whorls or a glandular appearance ;
C0040100
thymomas
C0040113
thymic