Intraosseous dural arteriovenous malformation (DAVM) is rare. The intraosse
ous component of this DAVM has usually been neglected on conventional angio
graphy and found during operation after the: bone drilling has been complet
ed. Considerable bleeding usually occurs during operation because of the un
expected hypervascular bone marrow. We report the use of MRI to help in the
diagnosis and therapeutic plan for this rare type of DAVM.