Brainstem cavernous malformation.

To cite: Woodley-Cook J, Noel de Tilly L, MacDonald L. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2012007679 A 50-year-old man presented to the emergency department with a 4-week history of worsening ataxia. CT (figure 1) and MRI (figures 2 and 3) demonstrated a lobulated lesion of varying densities on CTand signal intensities on MRI (‘popcorn’ ball apperance) in keeping with different stages of haemorrhage in his midbrain and pons. There was no evidence of hydrocephalus (figure 4). He was admitted under the neurosurgical service and