Purpose: The objective of this study was to propose a deep-learning model for the detection of the mandibular canal on dental panoramic radiographs. Materials and Methods: A total of 2,100 panoramic radiographs (PANs) were collected from 3 different machines: RAYSCAN Alpha (n=700, PAN A), OP-100 (n=700, PAN B), and CS8100 (n=700, PAN C). Initially, an oral and maxillofacial radiologist coarsely annotated the mandibular canals. For deep learning analysis, convolutional neural networks (CNNs) utilizing U-Net architecture were employed for automated canal segmentation. Seven independent networks were trained using training sets representing all possible combinations of the 3 groups. These networks were then assessed using a hold-out test dataset. Results: Among the 7 networks evaluated, the network trained with all 3 available groups achieved an average precision of 90.6%, a recall of 87.4%, and a Dice similarity coefficient (DSC) of 88.9%. The 3 networks trained using each of the 3 possible 2-group combinations also demonstrated reliable performance for mandibular canal segmentation, as follows: 1) PAN A and B exhibited a mean DSC of 87.9%, 2) PAN A and C displayed a mean DSC of 87.8%, and 3) PAN B and C demonstrated a mean DSC of 88.4%. Conclusion This multi-device study indicated that the examined CNN-based deep learning approach can achieve excellent canal segmentation performance, with a DSC exceeding 88%. Furthermore, the study highlighted the importance of considering the characteristics of panoramic radiographs when developing a robust deep-learning network, rather than depending solely on the size of the dataset.

Purpose: This study sought to compare the long-term outcomes of surgeries for retinal detachment (RD) secondary to viral or parasitic infectious retinitis. Methods: A total of 47 eyes that received pars plana vitrectomy with or without scleral buckling due to RD secondary to polymerase chain reaction-proven viral (cytomegalovirus, varicella zoster virus, and herpes zoster virus) or parasitic (toxoplasma and toxocara) retinitis from October 1, 2006, to June 30, 2023, in a single medical center were retrospectively enrolled. Results: Mean follow-up period was 59.03 ± 55.24 months in viral retinitis and 34.80 ± 33.78 months in parasitic retinitis after primary reattachment surgery. During follow-up, nine eyes (24.3%) with viral retinitis and five eyes (50.0%) with parasitic retinitis developed retinal redetachment. Visual acuity success at final follow-up was achieved in 19 eyes (51.4%) with viral retinitis and six eyes (60.0%) with parasitic retinitis (p = 0.64). The incidence of retinal redetachment during the 1st postoperative year was significantly higher in parasitic retinitis compared with viral retinitis (crude incidence, 0.21 vs. 0.85; p = 0.02). Hazard ratio analysis adjusted for age and sex showed 4.58-fold (95% confidence interval, 1.22–17.27; p = 0.03) increased risk of retinal redetachment in parasitic retinitis compared with viral retinitis during the 1st postoperative year. Tamponade with silicone oil and preoperative diagnostic vitrectomy were associated with significantly decreased risk of retinal redetachment in patients with parasitic retinitis. Conclusions Compared with RD secondary to viral retinitis, RD secondary to parasitic retinitis showed higher incidence of retinal redetachment during the 1st postoperative year. Tamponade with silicone oil and preoperative diagnostic vitrectomy were associated with significantly decreased risk of retinal redetachment in patients with parasitic retinitis.

Objective: Shoulder pain is a common post-mastectomy complication. This research aims to evaluate the role of shoulder structure changes in developing shoulder pain in post-mastectomy patients and determine ultrasonographic findings. Methods: Medical records of post-mastectomy patients with ipsilateral shoulder pain were reviewed. Ultrasonographic findings, visual analogue scale (VAS), Shoulder Pain and Disability Index (SPADI), age, body mass index, time from mastectomy, operation type, lymph node dissection type, presence of lymphedema, and radiation therapy were checked. Results: Of 40 patients, rotator cuff tear, subacromial-subdeltoid bursitis, calcific tendinitis, biceps brachii tendon sheath fluid accumulation, and tendinopathy were seen in ultrasonography. Age was statistically higher in the rotator cuff tear group than non-rotator cuff tear group. Time from mastectomy, VAS, and SPADI were statistically correlated with biceps brachii sheath fluid accumulation. Shoulders with tendinopathy developed pain shortly after surgery. VAS and SPADI were statistically correlated with presence of subscapularis or supraspinatus tendinopathy. Nine of thirteen patients (69.2%) with subscapularis tendinopathy had post-mastectomy lymphedema. Only two of fifteen (18.2%) patients with supraspinatus tendinopathy had a history of radiation therapy. Conclusion Shoulder pain and rotator cuff tendinopathy may occur soon after surgery; therefore, shoulder range of motion exercises and muscle strengthening exercises are necessary in the early days after surgery. Elderly patients have a risk of rotator cuff tear, which physicians should pay more attention to. Even though there is no history of lymphedema and radiation therapy, shoulder lesions may occur. Therefore, prevention of shoulder pain in all patients after breast cancer surgery is needed.

Here, we report early treatment outcomes of gene therapy for early onset retinitis pigmentosa (RP) (Leber congenital amaurosis) associated with biallelic RPE65 mutation in a 30-year-old female patient. Initially, her visual acuity (VA) was 20/200, and her visual field (VF) was severely constricted to the center in the left eye. Her electroretinography showed nearly extinct signals. Full-field stimulus threshold test (FST) revealed diminished dark-adapted light sensitivity. Voretigene neparvovec-rzyl (VN) is the first in vivo viral gene therapy agent to be approved. At 3 months after subretinal injection of VN in the left eye, VA, VF, and FST showed sustained improvement. She did not exhibit any signs of adverse effects from the treatment. Gene therapy for RP proved to be an effective and safe treatment in an advanced case of RPE65-associatied early onset RP.

Diffusion-weighted imaging (DWI) hyperintensities corresponding to ischemic areas have been regarded as an ischemic core. However, several studies have demonstrated the reversibility of DWI hyperintense signals in hyperacute stroke patients. We experienced the DWI reversibility of posterior circulation ischemia after revascularization of the proximal extracranial vertebral artery. The perfusion of the posterior circulation might be significantly reduced due to bilateral vertebral art ery occlusion. Considering this case, early improvement of the perfusion of the ischemic area might key role of DWI reversibility.

Cerebral intraventricular hemorrhage (IVH) is an extremely rare complication of carotid artery stenting (CAS). Fully dilated terminal arteries of a chronic, severely stenosed proximal artery could be ruptured by impaired autoregulation of cerebral blood flow. Hyperperfusion syndrome can occur even if there is no blood pressure fluctuation during the CAS. We report a case of an isolated IVH that occurred hours after CAS.

Objective: To investigate the epidemiologic and demographic characteristics of patients with spinal cord injury (SCI) who were admitted to a department of rehabilitation of a university hospital. Methods: This was a descriptive cross-sectional study. Medical records including sex, age at injury, type of disability, traumatic or non-traumatic etiology and presence of ossification of posterior longitudinal ligament (OPLL) of patients with SCI who were admitted to the department of rehabilitation between 2012 and 2018 were reviewed. Results: Of the 221 cases of SCI, 161 were traumatic and 60 were non-traumatic. The mean age at injury was 52.8 years. People aged 40–49 years showed highest proportion among overall SCI patients (19.0%). The proportion of male patients was higher in traumatic SCI at 4.96:1 than in non-traumatic SCI at 1.30:1. The most common cause of traumatic SCI was falling off (37.3%), followed by motor vehicle crash (35.4%) and tripping over (19.3%). Meanwhile, the most common cause of non-traumatic SCI was neoplasm (35.0%). Tripping over was the leading cause of traumatic SCI in patients aged ≥60 years (42.6%). A high proportion of traumatic SCI patients were found to have underlying OPLL (26.1%), particularly those who were injured by tripping over (64.5%). Conclusion The mean age of SCI patients was higher than that of previous studies. Falls was the single most common cause of traumatic SCI, and tripping over was the most common cause of injury in the elderly patients. OPLL was prevalent in patients who were injured from tripping over.

Cerebral intraventricular hemorrhage (IVH) is an extremely rare complication of carotid artery stenting (CAS). Fully dilated terminal arteries of a chronic, severely stenosed proximal artery could be ruptured by impaired autoregulation of cerebral blood flow. Hyperperfusion syndrome can occur even if there is no blood pressure fluctuation during the CAS. We report a case of an isolated IVH that occurred hours after CAS.

Cardiac arrhythmia is a rare manifestation of the Wallenberg syndrome; lesions are located in the brainstem, especially the lower medulla, which regulates sympathetic and parasympathetic activity. A 55-year-old man was admitted to the university hospital with symptoms including ataxia, left ptosis, decreased sensation of pain and temperature on the right side, left facial numbness, and dizziness. Brain magnetic resonance imaging revealed an infarction in the left dorsolateral medulla. Therefore, he was diagnosed with Wallenberg syndrome. While he underwent conservative treatment for Wallenberg syndrome, he experienced several events of self-limiting heart pounding, which required an evaluation of cardiac function. The 24-hour Holter monitor showed an increased RR interval with bradycardia and prolonged sinus pause. As a result, the diagnosis of sick sinus syndrome combined with Wallenberg syndrome was made. Sick sinus syndrome is a rare cardiac complication of the Wallenberg syndrome, and clinicians could overlook it when the initial electrocardiography shows a normal sinus rhythm. Sick sinus syndrome can cause sudden death without appropriate medical intervention. Therefore, clinicians should consider further evaluation, including a 24-hour Holter monitor, to check for the potential presence of sick sinus syndrome in the acute phase of Wallenberg syndrome.

Astigmatism ; Coma ; Corneal Topography ; Corneal Wavefront Aberration ; Humans ; Linear Models ; Lotus ; Myopia ; Refractive Surgical Procedures ; Retrospective Studies ; Visual Acuity