Cerebellar developmental venous anomalies with associated vascular pathology.

Cerebellar developmental venous anomalies (CDVA) are benign conditions, although sometimes they are associated with haemorrhages and reported to be symptomatic. This is the largest follow-up study to investigate the symptomatology of CDVAs and their association with other malformations. Thirty-two patients were followed for 2 - 9 years. Twenty-eight had isolated asymptomatic CDVA without any neurological condition during follow-up, which might be linked to the CDVA. Four patients had CDVA and an associated vascular pathology: two pontine cavernomas, one asymptomatic arteriovenous malformation (this is the first published case in the literature) and one cerebellar infarct with a developmental variation of the posterior fossa venous circulation. One patient had two CDVAs, while another had a unique draining vein from the upper part of the brainstem too. In conclusion, CDVAs are benign, asymptomatic conditions, but they are sometimes associated with pathogenic malformations requiring detailed neuroradiological investigations.