Magnetic resonance spectroscopy in childhood brainstem tumors.

Five children with brainstem tumors and two control patients had magnetic resonance spectroscopy studies of the brainstem. Two of the malignant tumor patients had magnetic resonance spectroscopy studies before and after radiation therapy. The third was irradiated 14 years earlier but developed new symptoms and a new brainstem lesion on MRI. Magnetic resonance spectroscopy demonstrated a different degree of malignancy between the old and new lesion. The fourth patient had magnetic resonance spectroscopy of a chronic, large pontine lesion 6 years after diagnosis and radiation. The spectral pattern suggested a low degree of malignancy. The fifth patient had neurofibromatosis type 1 with brainstem lesions. Magnetic resonance spectroscopy suggested neoplastic tissue of low malignancy. These results suggest that magnetic resonance spectroscopy offers additional information for anticipating the degree of anaplasia in children with brainstem tumors.