1. Minute, but dangerous, widenings (dilatations) of arteries often in the brain, in the region of the THALAMUS, believed to be an important cause of CEREBRAL HAEMORRHAGE. These are distinct from the berry aneurysms on the external arteries that also cause cerebral haemorrhage.
2. Tiny dilatations on retinal capillaries seen with the ophthalmoscope in cases of DIABETIC RETINOPATHY.