title: Dormant micro arteriovenous malformations lead to recurrent cerebral haemorrhage.
abstract: BACKGROUND
  Some micro arteriovenous malformations (AVMs) located in deep brain are undetectable. How to choose a proper timing to detect these AVMs remains unclear.
  
  
  METHODS
  A 21-year-old male patient was admitted to our center for intraventricular haematoma. Digital subtraction angiographies (DSAs) were performed one week and one month respectively after his haemorrhage, but no positive results were obtained. The patient was hospitalized for re-haemorrhage six years later. A micro AVM with two diffused niduses was detected and embolised three months after his re-haemorrhage. The patient recovered without any neurological deficit.
  
  
  RESULTS
  Compressive effects of haematoma and spontaneous obliteration of AVMs might play pivotal roles in negative DSA results.
  
  
  CONCLUSIONS
  Strategic and timely use of DSA could identify some dormant re-haemorrhagic AVMs.
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Jun
authors.initials: J
authors.lastname: Cai
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Hao
authors.initials: H
authors.lastname: Lin
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Shaoxue
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Zou
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Yanting
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Shiwan
authors.initials: S
authors.lastname: Liu
authors.affiliation: Department of Radiology, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510120 China.
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, 510006 China.
authors.forename: Xiaoxin
authors.initials: X
authors.lastname: Bai
keywords: Arteriovenous malformations; Cerebral haemorrhage; Digital subtraction angiography