OBJECTIVES: The pedunculopontine nucleus (PPN) is considered a promising new target for neurostimulation in Parkinson’s disease (PD) patients with postural instability and gait disturbance that is refractory to other treatment modalities. However, the PPN is typically difficult to visualize with magnetic resonance imaging (MRI) at clinical field strengths, which greatly limits the PPN as a viable surgical target for deep brain stimulation (DBS). Thus, the aim of this study is to directly visualize the PPN based on 7.0T ultrahigh-field MRI. METHODS: Five PD patients were enrolled and scanned using the MP2RAGE sequence on a 7.0T ultrahigh-field MRI scanner. Then, the MP2RAGE sequences were imported into a commercially available navigation system. The coordinates of the directly localized PPN poles were recorded in the navigation system relative to the anterior commissure-posterior commissure plane. RESULTS: Our results indicated that the PPN presented intermediate signal intensity in the 7.0T ultrahigh-field MR images in comparison with the surrounding structure, such as the hypo-intensity of the periaqueductal gray and the hyperintensity of the neighboring white matter tracts, in PD patients. The mean coordinates for the rostral and caudal poles of PPN were 6.50 mm and 7.20 mm lateral, 1.58 mm and 2.21 mm posterior, and 8.89 mm and 13.83 mm relative to the posterior commissure. CONCLUSION: Our findings provide, for the first time, direct visualization of the PPN using the MP2RAGE sequence on a 7.0T ultrahigh-field MRI, which may improve the accuracy of stereotactic targeting of the PPN and improve the outcomes in patients undergoing DBS.

Background Since hydrocelectomy remains the choice of surgical treatment of hydrocele and standard surgical procedures may cause postoperative discomfort and complications, a new minimal surgery procedure is needed. The scrotoscope was used for the diagnosis and treatment of intrascrotal lesions. The aim of the study is to illustrate a new minimal hydrocelectomy with the aid of scrotoscope, in an effort to decrease complications. Materials and Methods: Between 2002 and 2012, 65 patients underwent hydrocelectomy with the aid of a scrotoscope. Before carrying out hydrocelectomy, the scrotoscopy was first used to examine the intrascrotal contents to exclude any pathological lesions. After determining the condition of testis, epididymis and spermatic cord and excluding any other secondary causes of hydrocele, a 2.0cm scrotal incision was performed. The parietal tunica vaginalis was then grasped out of scrotum, and the mobilized tunica was excised. The scrotoscopy was then performed again to inspect the intrascrotal contents. Results Mean operative time was 35.4 minutes. No major complications occurred during the post-operative follow-up period. Of these 65 patients, 61 underwent scrotoscopy and minimal hydrocelectomy, two patients underwent open hydrocelectomy because thickening of hydrocele wall was identified; two patients with acute inflammation only underwent scrotoscopy. Pathological changes were observed among eight patients. All patients were satisfied with the outcomes. Conclusions Minimal hydrocelectomy shows commendable results and fewer complications. The combination of minimal hydrocelectomy and scrotoscopy seems to be an encouraging technique. This novel surgical procedure proves to be a viable option for the diagnosis and treatment of hydrocele.