Outcome is mainly determined by severity of preoperative neurologic deficit and use of anticoagulants. Evidence for a venous origin of SSEH is abundant in view of the observed anatomical distribution in different age categories and the absence of hypertension as an isolated risk factor.
Study Design.
Single-center retrospective case series.
Objective.
The purpose of this study was to assess the safety and accuracy of three-dimensional (3D)-printed individualized drill guides for pedicle and lateral mass screw insertion in the cervical and upper-thoracic region, by comparing the preoperative 3D surgical plan with the postoperative results.
Summary of Background Data.
Posterior spinal fusion surgery can provide rigid intervertebral fixation but screw misplacement involves a high risk of neurovascular injury. However, modern spine surgeons now have tools such as virtual surgical planning and 3D-printed drill guides to facilitate spinal screw insertion.
Methods.
A total of 15 patients who underwent posterior spinal fusion surgery involving patient-specific 3D-printed drill guides were included in this study. After segmentation of bone and screws, the postoperative models were superimposed onto the preoperative surgical plan. The accuracy of the realized screw trajectories was quantified by measuring the entry point and angular deviation.
Results.
The 3D deviation analysis showed that the entry point and angular deviation over all 76 screw trajectories were 1.40 ± 0.81 mm and 6.70 ± 3.77°, respectively. Angular deviation was significantly higher in the sagittal plane than in the axial plane (P = 0.02). All screw positions were classified as “safe” (100%), showing no neurovascular injury, facet joint violation, or violation of the pedicle wall.
Conclusions.
3D virtual planning and 3D-printed patient-specific drill guides appear to be safe and accurate for pedicle and lateral mass screw insertion in the cervical and upper-thoracic spine. The quantitative 3D deviation analyses confirmed that screw positions were accurate with respect to the 3D-surgical plan.
Level of Evidence: 4
Objective: To describe a new method for cranial reconstruction after posterior fossa craniectomy in the surgical treatment of Chiari 1 Malformation, through a technical note and by presenting three illustrative cases.Methods and materials: A virtual surgical planning workflow was established for planning of the posterior fossa decompression, the design of the suboccipital reconstruction, and for manufacturing of a 3D-printed PMMA casting mold. The casting accuracy was assessed by conducting a phantom experiment and clinical data was provided by means of three illustrative cases.
Results:The accuracy of implant fabrication was found to be excellent, particularly when the PMMA is introduced into the mold in a malleable state. In all three clinical cases the implants were fabricated and positioned with success. Postoperative analysis revealed that accurate placement was achieved, with only minor deviation compared to the preoperative plan.Conclusions: 3D virtual surgical planning provide feasible tools both for planning of the posterior fossa decompression and to intraoperatively fabricate accurate patient-specific suboccipital cranioplasties.
Differentiation of pituitary neuroendocrine tumor (PitNET) tissue from surrounding normal tissue during surgery is challenging. A number of fluorescent agents is available for visualization of tissue discrepancy, with the potential of improving total tumor resection. This review evaluates the availability, clinical and technical applicability of the various fluorescent agents within the field of pituitary surgery. According to PRISMA guidelines, a systematic review was performed to identify reports describing results of in vivo application of fluorescent agents. In this review, 15 publications were included. Sodium Fluorescein (FNa) was considered in two studies. The first study reported noticeable fluorescence in adenoma tissue, the second demonstrated the strongest fluorescence in non-functioning pituitary adenomas. 5-Aminolevulinic acid (5-ALA) was investigated in three studies. One study compared laser-based optical biopsy system (OBS) with photo-diagnostic filter (PD) and found that the OBS was able to detect all microadenomas, even when MRI was negative. The second study retrospectively analyzed twelve pituitary adenomas and found only one positive for fluorescence. The third investigated fifteen pituitary adenomas of which one displayed vague fluorescence. Indocyanine green (ICG) was researched in four studies with variable results. Second-Window ICG yielded no significant difference between functioning and non-functioning adenomas in one study, while a second study displayed 4 times higher fluorescence in tumor tissue than in normal tissue. In three studies, OTL38 showed potential in non-functioning pituitary adenomas. At present, evidence for fluorescent agents to benefit total resection of PitNETs is lacking. OTL38 can potentially serve as a selective fluorescent agent in non-functioning pituitary adenomas in the near future.
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