We present the contrast-enhanced dynamic MR imaging appearance of cerebral arteriovenous malformations (AVM) following gamma knife radiosurgery and discuss the implications of this finding with respect to treatment. Dynamic MR images obtained in our three AVM patients following radiosurgery revealed slowly enhancing lesions. This pattern is not observed in all cases involving AVMs following gamma knife radiosurgery. When it is present, a haemangioma-like lesion should be considered.
YamamotoYCoffeyRJ: Interim report on the radio-surgical treatment of cerebral arteriovenous malformations. The influence of size, dose, time, and technical factors on obliteration rate. J Neurosurg83: 832, 1985.
2.
YamamotoMIdeM: Late cyst convolution after gamma knife radiosurgery for cerebral arteriovenous malformations. Stereotact Funct Neurosurg70(suppl 1): 166, 1998.
3.
HaraMNakamuraM: Delayed cyst formation after radiosurgery for cerebral arteriovenous malformation: Two case reports. Minim Invasive Neurosurg41: 40, 1998.
4.
RabinovJD: Diagnostic imaging of angiographically occult vascular malformations. Neurosurg Clin N Am10: 419, 1999.
5.
ZabramskiJMHennJSCoonsS: Pathology of cerebral vascular malformations. Neurosurg Clin N Am10: 395, 1999.
6.
YamamotoYCoffeyRJ: Interim report on the radio-surgical treatment of cerebral arteriovenous malformations. The influence of size, dose, time, and technical factors on obliteration rate. J Neurosurg83: 832, 1995.
7.
NakayamaYTanakaA: Scalp cavernous angioma presenting as sinus pericranii: Diagnostic value of cerebral angiography and magnetic resonance imaging. Childs Nerv Syst16: 598, 2000.
LobatoRDPerezC: Clinical, radiological, and pathological spectrum of angiographically occult intracranial vascular malformations. Analysis of 21 cases and review of the literature. J Neurosurg68: 518, 1998.
10.
GaenslerEHDillonWP: Radiation-induced telangiectasia in the brain simulates cryptic vascular malformations at MR imaging. Radiology193: 629, 1994.
11.
PozzatiEGiangasperoF: Occult cerebrovascular malformations after irradiation. Neurosurgery39: 677, 1996.
12.
MaederPGudinchetF: Development of a cavernous malformation of the brain. Am J Neuroradiol19: 1141, 1998.
