THYMUS - Mixed epithelial and lymphocytic fibroma

Description of Specimen
The specimen consists presumably of one lobe of the thymus; it has been replaced by tumour. The tumour has a thick capsule; the cut surface shows a nodular pattern with nodules delineated by rather pale collagenous tissue. In some areas the tumour is apparently solid, in others there are cysts which in some cases are small enough to give a lacey pattern to the tumour. There are areas of haemorrhage apparent as well. It is not known whether this lesion was associated with myasthenia gravis or not. The histology is that of a mixed tumour but it is predominantly epithelial in type.