Fig. 28
From: Paediatric brainstem: A comprehensive review of pathologies on MR imaging
A known case of neurofibromatosis type I with hydrocephalus: a–b Axial T2-weighted images show mild expansion of the midbrain and pons with multiple hyperintense lesions involving the midbrain, pons and cerebellar peduncle (arrow). Periaqueductal hyperintensity with narrowing of the aqueduct (black arrow) resulting in third ventricular dilatation (dotted arrow)