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BACKGROUND AND IMPORTANCEObsessive-compulsive disorder (OCD) is a disabling psychiatric disorder, mainly treated with psychotherapy and pharmacotherapy. Surgical intervention may be appropriate for patients with treatment-refractory OCD. Deep brain stimulation (DBS) is an alternative for previously common ablative surgical procedures. Tractography has been proposed as a method for individualizing DBS treatment and may have the potential to improve efficacy.CLINICAL PRESENTATIONWe present a patient with treatment-refractory OCD previously treated with bilateral leucotomies, who underwent DBS surgery with targeting informed by tractography. Preoperative tractography to identify suitable DBS targets was undertaken. Structural images were also utilized for standard stereotactic surgical planning. The anteromedial globus pallidus internus (amGPi) was chosen as the target bilaterally after consideration of white matter projections to frontal cortical regions and neurosurgical approach. Bilateral amGPi DBS surgery was undertaken without adverse events. At 16-mo follow-up, there was a 48.5% reduction in OCD symptom severity as measured by the Yale-Brown Obsessive Compulsive Scale.CONCLUSIONThe amGPi can be a successful DBS target for OCD. This is the first known case to report on DBS surgery postleucotomies for OCD and highlights the utility of tractography for surgical planning in OCD.

Non-missile transorbital penetrating head injuries are relatively rare, though potentially fatal injuries. Trajectory for intracranial entrance is typically via the orbital roof, the superior orbital fissure (SOF), or the optic canal. Non-metallic intracranial penetrating injuries are even scarcer and may pose unusual diagnostic and surgical challenges. Here we present and discuss a unique case of a penetrating injury by a wooden foreign body (FB) which entered and expanded the inter-dural space of the lateral cavernous sinus (CS) sinus wall without intracavernous or intradural involvement. The patient was a 71 year-old male who fell face-down and sustained a penetrating transorbital injury by a dry twig fragment, which passed through the SOF and into the interdural space of lateral wall of the ipsilateral CS. The patient was fully conscious (GCS15) at presentation but had severe ocular injury (complete ophthalmoplegia and blindness of the injured eye). The wooden FB was successfully removed via a minimally invasive subtemporal intradural approach with no apparent immediate or long-term complications. We emphasize the unusual diagnostic and surgical challenges related to this kind of rare injuries as reflected by the decision-making considerations taken in the presented case.

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Background: Posterior reversible encephalopathy syndrome (PRES) is an uncommon clinicalneuroradiological syndrome with an unclear pathophysiology. Correlation between PRES and the use of immunosuppressant drugs have previously been described, as well as correlation between elevated blood pressure and PRES. Characteristic brain MRI manifestations include hyperintense lesions on T2 and FLAIR (fluid-attenuated inversion recovery) images. PRES is usually reversible within a short period of time after discontinuation of the presumably offending drug. Some cases of PRES might complicate with intracranial hemorrhage, refractory status epilepticus or expansive vasogenic brain edema (also regarded as "tumefactive" PRES). Methods: We present a case of a young man diagnosed with Hodgkin's lymphoma, following a laparotomy due to cecal volvulus. The patient received glucocorticoids and elevated blood pressure values were recorded. Brain imaging studies were performed due to generalized epileptic seizures, demonstrating neuroradiological findings consistent with PRES. Neurological and neuroradiological deterioration was noted, necessitating urgent neurosurgical intervention. A complete neurological and functional rehabilitation was achieved. Conclusion: The uncommon cases of complicated PRES should be taken under consideration whenever clinical deterioration is noted following the diagnosis of PRES. Early neuroradiological evaluation should be sought, together with aggressive medical and surgical treatment in cases of life threatening mass effect.