Figure 1From: Post-radiation dedifferentiation of meningioma into osteosarcoma.MRI of head. a: In August 2000 second recurrence of pituitary adenoma was detected with incidental 1.3 cm meningioma (arrow). B: By January 2001 the meningioma (arrow) grew rapidly and reached 3.5 cm in 5 months.Back to article page