Determinants of Functional Independence or Its Loss following Subthalamic Nucleus Stimulation in Parkinson ’s Disease
Conclusions: We found that functional status following bilateral STN-DBS is closely related to preoperative axial symptoms. When loss of independence is a potential target for STN-DBS, clinicians should take into consideration the severity of axial impairment before surgery.Stereotact Funct Neurosurg (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - July 2, 2019 Category: Neurosurgery Source Type: research

Ultrasound-Guided DREZotomy: Technical Note
Dorsal root entry zone (DREZ) lesioning is still used as a choice of treatment for some painful conditions as well as spasticity in selected patients. The most commonly used techniques to perform DREZotomy are the microsurgical one and DREZ radiofrequency (RF) coagulation. The technical difficulties using punctures to perform RF lesions include complications such as occurrence of lesions in the dorsal columns or in the corticospinal tract. This paper describes a new technical improvement in RF lesions at DREZ using intraoperative ultrasound (US) to optimize the lesions and to minimize the risk of complications. Using intra...
Source: Stereotactic and Functional Neurosurgery - July 2, 2019 Category: Neurosurgery Source Type: research

Preliminaries
Stereotact Funct Neurosurg 2019;97(suppl 1):I –II (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - June 21, 2019 Category: Neurosurgery Source Type: research

Prelims
Stereotact Funct Neurosurg 2019;97(suppl 1):I –II (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - June 21, 2019 Category: Neurosurgery Source Type: research

Abstracts
Stereotact Funct Neurosurg 2019;97:1 –560 (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - June 21, 2019 Category: Neurosurgery Source Type: research

Single-Session versus Multisession Gamma Knife Radiosurgery for Large Brain Metastases from Non-Small Cell Lung Cancer: A Retrospective Analysis
Conclusions: M-GKS may be an effective alternative for large brain metastases from NSCLC. Specifically, severe radiation-induced toxicity ( ≥grade 3) did not occur in M-GKS for large-volume metastases. Although the long-term effects and results from larger samples remain unclear, M-GKS may be a suitable palliative treatment for preserving neurological function.Stereotact Funct Neurosurg (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - May 22, 2019 Category: Neurosurgery Source Type: research

A Comparative Study of Fiducial-Based and Fiducial-Less Registration Utilizing the O-Arm
Conclusion: Although there was no statistically significant difference in RE or the need for additional passes, the increased number of errors ≥2.5 mm with the FL method (17 vs. 4% in FB) indicates the need for further study. We concluded that O-arm images of the implants should be utilized to assess and correct for this error.Stereotact Funct Neurosurg (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - May 14, 2019 Category: Neurosurgery Source Type: research

Anterior Thalamic Stimulation Induced Relapsing Encephalitis
We present a case of relapsing herpes simplex encephalitis (HSE) as a newly reported and potentially fatal stimulation-related adverse effect following stimulation of the anterior thalamic nucleus (ANT-DBS) accompanied by fever, confusion, and cognitive impairment in a 32-year-old epileptic patient with a history of herpes meningoencephalitis 31 years earlier. The T2-weighted/FLAIR high-signal intensity in the temporal lobe developed at a “distance” from the stimulation target. The positive polymerase chain reaction of herpes virus deoxyribonucleic acid in the cerebrospinal fluid confirmed the diagnosis. The condition ...
Source: Stereotactic and Functional Neurosurgery - May 6, 2019 Category: Neurosurgery Source Type: research

WSSFN Society News
Stereotact Funct Neurosurg 2019;97:66 –66 (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - April 24, 2019 Category: Neurosurgery Source Type: research

ASSFN Society News
Stereotact Funct Neurosurg 2019;97:67 –67 (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - April 24, 2019 Category: Neurosurgery Source Type: research

ESSFN The Mission
Stereotact Funct Neurosurg 2019;97:68 –68 (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - April 24, 2019 Category: Neurosurgery Source Type: research

Neurosurgeons ’ Armamentarium for the Management of Refractory Postherpetic Neuralgia: A Systematic Literature Review
Conclusions: There are several available neurosurgical approaches for recalcitrant PHN including neuromodulatory and ablative procedures. It is suggested that patients with resistant PHN undergo minimally invasive procedures first, including SCS, peripheral nerve stimulation or DRG radiofrequency lesioning. More invasive procedures should be reserved for refractory cases. Comparative studies are needed in order to construct a PHN neurosurgical management algorithm.Stereotact Funct Neurosurg 2019;97:1 –11 (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - April 17, 2019 Category: Neurosurgery Source Type: research

Spinal Cord Stimulation for Restless Legs Syndrome: Case Series and Mechanistic Hypothesis
Conclusions: To our knowledge, this is the first reported case of using SCS as a potentially long-lasting, safe, and highly effective therapy for RLS of mixed etiology. Additionally, 2 patients with RLS possibly secondary to chronic pain also benefited from the therapy. This success may be due to increased inhibition from hypothalamic cells controlling dopaminergic input to the spine.Stereotact Funct Neurosurg (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - April 15, 2019 Category: Neurosurgery Source Type: research

Unexpected Daily Changes in Tumor Volume during Fractionated Gamma Knife Radiosurgery for Solitary Intraventricular Metastatic Renal Cell Carcinoma: A Case Report
For most fractionated stereotactic radiosurgery treatment plans, daily imaging is not routinely performed, because there is little expectation that lesions will change significantly in the short term. However, here, we present the case of an abrupt increase and decrease in tumor volume during fractionated gamma knife radiosurgery (GKRS) for metastatic brain cancer. A 65-year-old man with a history of nephrectomy due to renal cell carcinoma was admitted to our hospital because of mild cognitive disorder and gait disturbance. An initial MRI of the brain demonstrated a 5 × 3 × 4.5 cm-sized, heterogeneously well-enhanced tum...
Source: Stereotactic and Functional Neurosurgery - April 15, 2019 Category: Neurosurgery Source Type: research

Optimization of Medial Forebrain Bundle Stimulation Parameters for Operant Conditioning of Rats
Conclusion: We determined the optimal parameters for movement control of animals in operant conditioning and locomotor tasks by adjusting various electrical stimulation parameters. Our results reveal that a burst stimulation is more effective than a tonic stimulation for increasing the moving speed and number of lever presses. The use of this stimulation technique also allowed us to minimize the training required to control animal behavior.Stereotact Funct Neurosurg (Source: Stereotactic and Functional Neurosurgery)
Source: Stereotactic and Functional Neurosurgery - April 4, 2019 Category: Neurosurgery Source Type: research