PT - JOURNAL ARTICLE AU - E L Leisti AU - J Pyhtinen AU - M Poyhonen TI - Spontaneous decrease of a pilocytic astrocytoma in neurofibromatosis type 1. DP - 1996 Oct 01 TA - American Journal of Neuroradiology PG - 1691--1694 VI - 17 IP - 9 4099 - http://www.ajnr.org/content/17/9/1691.short 4100 - http://www.ajnr.org/content/17/9/1691.full SO - Am. J. Neuroradiol.1996 Oct 01; 17 AB - A patient with type 1 neurofibromatosis was followed up with neuroimaging over a period of 12 years. A spontaneous decrease in the size of a histologically verified pilocytic astrocytoma was documented on serial CT and MR examinations. Subsequent studies showed the development of a lesion in the contralateral hemisphere with mass effect and contrast enhancement. Results of a biopsy disclosed normal brain tissue; follow-up imaging showed a spontaneous decrease in the size of this abnormality.