Just why active cytomegalovirus is associated with glioblastoma is still unclear.

They discovered cytomegalovirus in the tumours of more than 90% of those people with glioblastoma whom they examined, but not in healthy brain tissue, nor in non-malignant brain tumours.

Sarcomas, including leiomyosarcomas, often have very large bizarre giant cells along with the spindle cells. A couple of mitotic figures appear at the left and lower left.