• Martin Jakobs, Jessica Jesser, Tobias Albrecht, Antje Wick, Andreas Unterberg, and Rezvan Ahmadi.
• Department of Neurosurgery, University Hospital Heidelberg, Heidelberg, Germany.
• Neuromodulation. 2019 Dec 1; 22 (8): 978-985.

IntroductionSphenopalatine ganglion stimulation (SPG-S) is an invasive form of neuromodulation by which a neurostimulator is implanted into the pterygopalatine fossa to treat refractory chronic cluster headache. The implant is MRI conditional, up to 3 T, however there is no clinical data on the shape, size, and location of the artifact produced by the implant.Materials And MethodsRecords of patients with SPG-S were analyzed for postoperative cranial MRI scans. MRI and intraoperative CT scans for visualization of the implant were fused and volumetry was performed for both the implant and the MRI artifact in different MRI sequences.ResultsIn total, n = 3 patients with postoperative MRI scans were identified. The mean CT artifact volume was 0.73 cm3 (±0.15 cm3 ). MRI artifact volume differed between sequences (range: 25.2-220.7 cm3 ). The intracranial space was largely unaffected besides the pole of the ipsilateral temporal lobe and the basal frontal gyrus. MRI artifacts affected the extracranial space (orbit, maxillary and ethmoid sinuses, and parts of the parotid gland). No adverse events occurred during or after MRI scans.ConclusionsCranial MRI scans with SPG-S implants were safely performed in three patients following the manufacturer's MRI conditions. MRI artifacts were mostly located in the extracranial space. Brain MRI imaging is largely unaffected.Conflict Of InterestThe authors declare no potential conflicts of interest with respect to research, authorship, and/or publication of this article.© 2018 International Neuromodulation Society.

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