Fig. 4

Spontaneous regression of an OPG in Patient 3. a A 516 mm³ left prechiasmatic optic nerve glioma on this patient’s first MRI at age 6.3 years. The tumour volume was unchanged over 2 MRI examinations during the next 2.2 years. b On re-examination at 9.3 years of age the OPG volume had decreased to 462 mm³, and the volume decreased again to 436 mm³ when the patient was 11.2 years old. The tumour volume was unchanged on the patient’s last MRI in this study at age 11.7 years