Forelimb lameness caused by Malignant peripheral nerve sheath tumors of the median nerve in a dog: a case report.

An 8-year-old Portuguese Water Dog presented with a 5-month history of left forelimb lameness. There was palmar pain. Ultrasonography revealed enlargement of the left median nerve. Subsequent MRI also showed enlargement of the median nerve in the distal palmar to the mid-forearm region. Rapid intraoperative diagnosis suggested Malignant peripheral nerve sheath tumors (MPNST) and a neurotomy was performed. The lameness had almost disappeared in 1 month after surgery. Recurrence occurred 26 months postoperatively and the forelimb was amputated. At 950 days after the neurotomy, radiography revealed lung metastasis, and the dog died 988 days after the neurotomy. Neurotomy for MPNST should be performed with caution until more information is available regarding methods for early detection, margin determination, and indication determination for neurotomy.

Ocular Signs and Testing Most Compatible with Sarcoidosis-Associated Uveitis: A Latent Class Analysis.

Purpose: This study aims to explore the potential subgroups of sarcoidosis-associated uveitis (SAU) within a multicenter cohort of uveitis participants. Design: Cross-sectional study. Participants: A cohort of 826 uveitis patients from a uveitis registry from 19 clinical centers in 12 countries between January 2011 and April 2015. Methods: We employed a latent class analysis (LCA) incorporating recommended tests and clinical signs from the revised International Workshop on Ocular Sarcoidosis (IWOS) to identify potential SAU subgroups within the multicenter uveitis cohort. Additionally, we assessed the performance of the individual tests and clinical signs in classifying the potential subclasses. Main Outcome Measures: Latent subtypes of SAU. Results: Among 826 participants included in this analysis, the 2-class LCA model provided a best fit, with the lowest Bayesian information criteria of 7218.7 and an entropy of 0.715. One class, consisting of 548 participants, represented the non-SAU, whereas the second class, comprised of 278 participants, was most representative of SAU. Snowballs/string of pearls vitreous opacities had the best test performance for classification, followed by bilaterality and bilateral hilar lymphadenopathy (BHL). The combination of 4 tests with the highest classification importance, including snowballs/string of pearls vitreous opacities, periphlebitis and/or macroaneurysm, bilaterality, and BHL, demonstrated a sensitivity of 84.8% and a specificity of 95.4% in classifying the SAU subtypes. In the exploratory analysis of the 3-class LCA model, which had comparable fit indices as the 2-class model, we identified a candidate non-SAU subtype, candidate SAU subtype with pulmonary involvement, and a candidate SAU with less pulmonary involvement. Conclusions: Latent class modeling, incorporating tests and clinical signs from the revised IWOS criteria, effectively identified a subset of participants with clinical features indicative of SAU. Though the sensitivity of individual ocular signs or tests was not perfect, using a combination of tests provided a satisfactory performance in classifying the SAU subclasses identified by the 2-class LCA model. Notably, the classes identified by the 3-class LCA model, including a non-SAU subtype, an SAU subtype with pulmonary involvement, and an SAU subtype with less pulmonary involvement, may have potential implication for clinical practice, and hence should be validated in further research. Financial Disclosures: Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

Sarcoid Uveitis in Children.

Sarcoidosis is a multi-system granulomatous disease that often presents with uveitis. Although sarcoidosis and sarcoid uveitis typically occur in adulthood, children also may be affected. There are two distinct clinical presentations of the pediatric disease, associated with younger and older age groups, and having different causations. "Early-onset sarcoidosis", beginning at age 5 years or less, is an autosomal dominant genetic disease, caused by a mutation in the NOD2 gene. It is also known as sporadic Blau syndrome or Jabs syndrome. "Adult-type sarcoidosis", usually beginning between the ages of 8 and 15 years, is believed to represent an excessive response to an environmental antigen. There is limited literature on the management of pediatric sarcoidosis, and treatment follows an approach applied to other forms of pediatric non-infectious uveitis. When systemic immunomodulatory therapy is indicated, methotrexate and/or adalimumab are often employed. The condition may persist into adulthood, and thus long-term follow-up is indicated.

Measurement of Femoral Trochlear Morphology in Dogs Using Ultrasonography.

OBJECTIVE: The aim of this study was to examine a method for measuring femoral trochlear morphology in dogs using ultrasonography, and survey femoral trochlear morphology in skeletally normal dogs. STUDY DESIGN: To examine the validity of ultrasonography, three raters measured the sulcus angle (SA; the angle between the medial and lateral facets) five times in five skeletally normal dogs. Intra- and interrater reliabilities were then calculated. We also calculated the correlation coefficient between SAs measured using ultrasonography and computed tomography (CT) or magnetic resonance imaging (MRI). Then, we surveyed the femoral trochlear morphology in skeletally normal dogs using ultrasonography. RESULTS: The intra- and interrater reliability for SAs measured using ultrasonography was good, and the correlation coefficient between SAs measured using ultrasonography and CT, or MRI, was strong. In skeletally normal dogs, the SAs for osseous contours decreased until 6 months of age. However, the SAs for cartilaginous contours did not change during the growth period. CONCLUSION: The ultrasonographic measurement method is reliable for the evaluation of femoral trochlear morphology in dogs. The contour of the articular cartilage surface of the femoral trochlea is already determined early in life, and ossification of the articular cartilage of the femoral trochlea proceeds until 6 months of age. The results of this study will provide crucial information for the evaluation of femoral trochlear morphology in dogs.

A COVID-19 perspective of Vogt-Koyanagi-Harada disease.

Vogt-Koyanagi-Harada (VKH) disease, a bilateral granulomatous panuveitis associated with multisystem involvement, is a T-cell-mediated autoimmune disorder in which cytotoxic T-cell target melanocytes in genetically susceptible individuals. Recently, there has been an increase in literature on the new onset of uveitis and reactivation of previously diagnosed cases of uveitis following Covid-19 vaccinations. It has been postulated that Covid-19 vaccines can lead to an immunomodulatory change resulting in an autoimmune phenomenon in the recipients. VKH following COVID-19 infection was reported in four patients and a total of 46 patients developing VKH or VKH-like disease following COVID-19 vaccinations. There are reports of four patients who had been recovering or recovered from VKH after receiving the first dosage of the vaccine and developed worsening of ocular inflammation after receiving the second dose of the vaccine.

Human T-cell Leukemia Virus Type 1 (HTLV-1)-induced Uveitis.

Human T-cell leukemia virus type 1 (HTLV-1) is a human retrovirus that causes T-cell malignant diseases (adult T-cell leukemia/lymphoma) and HTLV-1-related non-malignant inflammatory diseases, such as HTLV-1 uveitis. Although the symptoms and signs of HTLV-1 uveitis are nonspecific, intermediate uveitis with various degrees of vitreous opacity is the most common clinical presentation. It can occur in one or both eyes and its onset is acute or subacute. Intraocular inflammation can be managed with topical and/or systemic corticosteroids; however, recurrence of uveitis is common. The visual prognosis is generally favorable, but a certain proportion of patients have a poor visual prognosis. Systemic complications of patients with HTLV-1 uveitis include Graves' disease and HTLV-1-associated myelopathy/tropical spastic paraparesis. This review describes the clinical characteristics, diagnosis, ocular manifestations, management, and immunopathogenic mechanisms of HTLV-1 uveitis.

Laboratory Investigations in Infectious Uveitis.

Laboratory investigations can play a significant role in the diagnosis and decision-making of infectious uveitis. Though direct demonstration of the infective organism remains the gold standard of diagnosis, it is not always possible with ocular tissues. Recent advancements in molecular techniques have made it possible to overcome these limitations and to identify the genomic DNA of pathogens associated with infectious uveitis. Techniques such as next-generation sequencing can analyze all DNA-based lifeforms, regardless of whether they are bacteria, fungi, viruses, or parasites and have been used in the laboratory diagnosis of intraocular inflammation. On the other hand, serological tests, though they dominate the diagnostic landscape of various infectious etiologies in uveitis in routine clinical practice, have varied specificities and sensitivities in different infectious uveitis. In this review, we focus on various methods of laboratory diagnosis of infectious uveitis and discuss the recent advances in molecular diagnosis and their role in various infectious clinical entities.

The International Vitreoretinal B-Cell Lymphoma Registry: a protocol paper.

INTRODUCTION: Vitreoretinal lymphoma is a rare ocular cancer with high morbidity and mortality despite treatment. Diagnosis by cytopathology is often delayed, and various molecular and image-based investigations have been developed. Diverse treatments are used, but there is a limited medical evidence to differentiate their effectiveness. We designed an international registry that would collect diagnostic, treatment and outcomes data, to establish new evidence for the management of this cancer. METHODS AND ANALYSIS: The International Vitreoretinal B-Cell Lymphoma Registry will accrue data retrospectively for individuals aged 18 years or older, diagnosed with new or recurrent vitreoretinal B-cell lymphoma on or after 1 January 2020. A steering committee of subspecialised ophthalmologists identified 20 key clinical data items that describe patient demographics, tissue involvements, diagnostic testing, ocular and systemic treatments and treatment complications, and visual acuity and survival outcomes. Customised software was designed to permit collection of these data across a single baseline and multiple follow-up forms. The platform collects data without identifiers and at 3 month reporting intervals. Outcomes of the project will include: (1) descriptions of clinical presentations, and diagnostic and therapeutic preferences; (2) associations between clinical presentations, and diagnostics and treatments, and between diagnostics and treatments (assessed by ORs with 95% CIs); and (3) estimations of rates of vision loss, and progression-free and overall survival (assessed by Kaplan-Meier estimates). ETHICS AND DISSEMINATION: The registry has received Australia-wide approval by a national human research ethics committee. Sites located outside Australia are required to seek local human research ethics review. Results generated through the registry will be disseminated primarily by peer-reviewed publications that are expected to inform clinical practice, as well as educational materials.

Computed Tomographic Measurements of the Sulcus Angle of the Femoral Trochlea in Small-Breed Dogs with and without Medial Patellar Luxation.

Trochleoplasty is often performed in dogs with medial patellar luxation (MPL); however, the current guidelines on when to perform a trochleoplasty in dogs are vague. The sulcus angle (SA) is used to assess the femoral trochlear morphology in humans. The aim of this study is to describe a method to measure the SA and other parameters of trochlea morphology in dogs using computed tomography. First, we searched for a suitable measuring location for the SA. Transverse images of the femurs were obtained as perpendicular planes to the tangent of the femoral trochlea which was 0 to 60 degrees (every 5 degrees) to the anatomical axis of the femur. The deepest point of the femoral trochlea was found in the transverse images perpendicular to the tangent of the femoral trochlea which was at 15 degrees to the anatomical axis of the femur. The SA and the other parameters of femoral trochlea morphology were measured at the deepest point of the femoral trochlea. The SA of the stifle joints with grade 3 and 4 MPL was significantly higher than the SA of stifle joints not affected by MPL. There was no significant difference in the SA between dogs affected by grade 1 and 2 MPL and dogs not affected by MPL. Further studies are needed to establish whether the SA can be used as selection criteria for trochleoplasty.

Challenges in the diagnosis and management of vitreoretinal lymphoma - Clinical and basic approaches.

Vitreoretinal lymphoma (VRL) is a subtype of diffuse large B-cell lymphoma and is sight- and life-threatening in the vast majority of patients. Lymphoma cells infiltrate the vitreous body and/or subretinal space and exhibit clinical signs of vitreous opacities and creamy white subretinal lesions. Although the intraocular signs can serve as clues to suspect VRL, they are nonspecific and may be misdiagnosed as uveitis. Histopathological evidence of malignant cells on vitreous biopsy, for instance, is the gold standard for diagnosis of VRL; however, cytological examination of the vitreous often results in a low success rate owing to the small quantity and poor quality of tissues and cells in the sample. Recent advancements in immunological, molecular, and gene analyses using intraocular samples have made it possible to accurately diagnose VRL. As for the management of VRL, local treatments with irradiation and/or intravitreal injections of anti-tumor agents (methotrexate or rituximab) are effective in suppressing intraocular VRL lesions. However, the effect of systemic chemotherapy, with or without brain irradiation, on preventing central nervous system involvements remains controversial. In this review article, we discuss the following concepts based on previous literature and our unpublished results: current ocular imaging examinations such as optical coherence tomography and fundus autofluorescence; immunological, molecular, and gene expression characterization of intraocular biopsies with special attention to flow cytometry; immunoglobulin gene rearrangement assays that use the polymerase chain reaction test; cytokine assays; gene mutations (MYD88, CD79B); and current local and systemic treatments of VRL.

Long-term outcome in corneal endotheliitis with molecular detection of herpes simplex virus 1 and human herpes virus 6: a case report.

BACKGROUND: Human herpesvirus 6B (HHV-6B) is known to cause exanthema subitem and has been detected in various ocular diseases, including keratitis, uveitis, optic neuritis, and endophthalmitis; however, the long-term outcome after the reactivation of HHV-6B has not been well-addressed. Sugita et al. previously reported the concomitant presence of HHV-6B with herpes simplex virus-1 (HSV-1) in the aqueous fluid at the onset of corneal endotheliitis. We focused on the same patient with corneal endotheliitis, in whom both HSV-1 and HHV-6B sequences were observed, and reported the clinical course and long-term outcomes. CASE PRESENTATION: A 64-year-old woman was referred to our center for visual disturbances in the left eye. Her best-corrected visual acuity in the left eye was 0.5 and the left intraocular pressure was elevated to 33 mmHg. Mid-sized keratic precipitates and 2+ cells were observed in the anterior chamber with corneal endothelial edema and reduction of the corneal endothelial cell density to 1828 cells/mm2. The patient was diagnosed with corneal endotheliitis with increased intraocular pressure. Polymerase chain reaction analysis revealed the concomitant presence of both HSV-1 and HHV-6B sequences in the left aqueous fluid. After treatment with oral valacyclovir and topical betamethasone, her intraocular inflammation gradually improved and has not recurred at 12 years after corneal endotheliitis onset although corneal opacity remained. CONCLUSIONS: Reactivation of HHV-6B infection might be associated with HSV-1 corneal endotheliitis; however, no serious late sequelae occurred after appropriate treatment for HSV-1 infection in this immunocompetent host.

Congenital syringohydromyelia in a crossbred (Holstein-Friesian × Japanese Black) beef calf.

A 5-day-old male crossbred beef calf presented with a well-coordinated bilateral hopping gait of the hind limbs. Postmortem CT showed a poorly defined oval-shaped region at the L3-L4 spinal segments, which had high signal intensity on T2 weighted postmortem MRI images. On pathological examination, we identified a large cystic cavity filled with a large amount of cerebrospinal fluid on the cut surface of the spinal region. Histopathological examination revealed that the spinal cord parenchyma was compressed by the cystic structure, and the cystic cavity was lined with a thin layer of discrete ependymal cells, indicating syringohydromyelia. This is the first reported case of a Holstein-Friesian × Japanese Black crossbred calf with solitary syringohydromyelia. Our findings suggest that myelodysplasia with cystic cavities can be suspected by CT, without the need for MRI.

Clinical Characteristics, Management, and Factors Associated with Poor Visual Prognosis of Acute Retinal Necrosis.

Purpose: To identify the clinical characteristics of acute retinal necrosis (ARN) and clarify factors associated with poor visual prognosis.Methods: a nationwide multi-center retrospective chart review study was performed in Japan using data from the medical records of 149 consecutive ARN patients. Demographics, ocular signs, virologic testing of intraocular fluids, and treatment were examined. Factors associated with poor visual prognosis were investigated by regression analysis.Results: At initial presentation, anterior chamber cells or mutton-fat keratic precipitates (97%), unilaterality (93%), and yellow-white retinal lesions (86%) were recognized. In the clinical course, rapid circumferential expansion of retinal lesions (39%), development of retinal break or retinal detachment (55%), and optic atrophy (43%) were recorded. Four variables were identified as associated with poor visual prognosis.Conclusions: The present study identified clinical characteristics and factors associated with poor visual prognosis of ARN.

Comparison of combination therapy of prednisolone and cyclosporine with corticosteroid pulse therapy in Vogt-Koyanagi-Harada disease.

PURPOSE: To compare the efficacy and safety of a combination therapy of prednisolone and cyclosporine and corticosteroid pulse therapy in Vogt-Koyanagi-Harada (VKH) disease. STUDY DESIGN: A prospective, multicenter, randomized, non-inferiority trial. METHODS: Patients of new-onset acute VKH disease at 11 centers in Japan between 2014 and 2018 were randomized to a combination (oral prednisolone 60 mg daily with gradual taper-off to 35 mg/day and cyclosporine 3 mg/kg/day) and corticosteroid (methylprednisolone 1000 mg for 3 days followed by oral prednisolone) groups, and were followed for 1 year. RESULTS: Thirty-four were assigned to the combination and thirty-six patients to the corticosteroid group. Recurrence/worsening risk was 0.15 (95% confidence-interval [CI] 0.03-0.27) in the combination group and 0.25 (95% CI 0.11-0.39) in the corticosteroid group, with a risk difference of - 0.10 (90% CI - 0.27 to 0.06), demonstrating non-inferiority of the combination group with a non-inferiority margin of 0.20 (P = 0.0013). Serious adverse events occurred in three patients (two with hyponatremia and one with severe headaches) in the combination group and none in the corticosteroid group. Sunset glow fundus grades and cataract rates at 1 year were 0.57 (95% CI 0.42-71) and 4.3% in the combination group and 0.91 (95% CI 0.78-1.04) and 34.0% in the corticosteroid group, respectively. CONCLUSIONS: Combination therapy was noninferior to corticosteroid therapy with respect to recurrence/worsening risk. Notably, the recurrence/worsening risk, sunset glow fundus grade, and cataract rate were lower in the combination group than in the corticosteroid group.

Vitreoretinal Lymphoma.

Vitreoretinal lymphoma (VRL) is a rare variant of primary central nervous system lymphoma (PCNSL), mostly of diffuse large B cell lymphoma, which affects the retina and/or the vitreous with or without optic nerve involvement. The disease course is aggressive. Up to 90% of the patients develop central nervous system lymphoma within one year. The diagnosis of VRL is challenging due to nonspecific chronic and relapsing uveitis and is made by anterior chamber tab or vitreous aspirate biopsy. There is no established treatment protocol for VRL patients with bilateral involvement without CNS involvement. There are suggestions to use only intravitreal chemotherapy with methotrexate and/or rituximab. Alternatively, systemic high-dose MTX treatment or external beam radiotherapy is used. Further studies are needed to prove and confirm the prophylactic systemic therapy in preventing CNS involvement in limited VRL.

Consensus Recommendations for the Diagnosis of Vitreoretinal Lymphoma.

PURPOSE: To provide recommendations for diagnosis of vitreoretinal lymphoma (VRL). METHODS: Literature was reviewed for reports supporting the diagnosis of VRL. A questionnaire (Delphi 1 round) was distributed to 28 participants. In the second round (Delphi 2), items of the questionnaire not reaching consensus (75% agreement) were discussed to finalize the recommendations. RESULTS: Presenting symptoms include floaters and painless loss of vision, vitreous cells organized into sheets or clumps. Retinal lesions are usually multifocal creamy/white in the outer retina. Other findings include retinal lesions with "leopard-skin" appearance and retinal pigment epithelium atrophy. Severe vitreous infiltration without macular edema is the most likely presentation. Diagnostic vitrectomy should be performed. Systemic corticosteroid should be discontinued at least 2 weeks before surgery. An interleukin (IL)-10:IL-6 ratio > 1, positive mutation for the myeloid differentiation primary response 88 gene and monoclonality are indicators of VRL. Multi-modal imaging (optical coherence tomography, fundus autofluorescence) are recommended. CONCLUSIONS: A consensus meeting allowed the establishment of recommendations important for the diagnosis of VRL.

Distinguishing Features of Anterior Uveitis Caused by Herpes Simplex Virus, Varicella-Zoster Virus, and Cytomegalovirus.

PURPOSE: To determine distinguishing features of the clinical characteristics of anterior uveitis (AU) caused by herpes simplex virus (HSV), varicella-zoster virus (VZV), and cytomegalovirus (CMV). DESIGN: Retrospective, multicenter case series. METHODS: Consecutive patients with herpetic AU examined at 11 tertiary centers in Japan between January 2012 and December 2017 and who were followed for ≥3 months were evaluated. Diagnosis was made by polymerase chain reaction (PCR) for HSV, VZV, or CMV in the aqueous humor, or classical signs of herpes zoster ophthalmicus. RESULTS: This study enrolled 259 herpetic AU patients, including PCR-proven HSV-AU (30 patients), VZV-AU (50), and CMV-AU (147), and herpes zoster ophthalmicus (32). All HSV-AU and VZV-AU patients were unilateral, while 3% of CMV-AU patients were bilateral. Most HSV-AU and VZV-AU patients were sudden onset with an acute clinical course, while CMV-AU had a more insidious onset and chronic course. There were no significant differences for all surveyed symptoms, signs, and complications between HSV-AU and VZV-AU. However, significant differences were detected for many items between CMV-AU and the other two herpetic AU types. Ocular hyperemia and pain, blurring of vision, ciliary injection, medium-to-large keratic precipitates (KPs), cells and flare in the anterior chamber, and posterior synechia significantly more often occurred in HSV-AU and VZV-AU vs CMV-AU. In contrast, small KPs, coin-shaped KPs, diffuse iris atrophy, elevated intraocular pressure, and glaucoma surgery were significantly more frequent in CMV-AU vs HSV-AU and VZV-AU. CONCLUSION: This multicenter, retrospective study identified distinguishing features of HSV-AU, VZV-AU, and CMV-AU.

A Validation Study of the Revised Diagnostic Criteria from the International Workshop on Ocular Sarcoidosis at a Single Institute in Japan.

Purpose: To validate the revised criteria of the International Workshop on Ocular Sarcoidosis (IWOS) for the diagnosis of ocular sarcoidosis (OS).Methods: A retrospective chart review study was performed on 323 patients including 51 patients with biopsy-proven sarcoidosis and 272 patients with other uveitis entities. Data on intraocular signs and systemic investigations were collected, and sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and the Youden index were calculated.Results: All intraocular signs and most systemic investigations showed high diagnostic parameters. Sensitivity, specificity, PPV, and NPV of the revised IWOS criteria were 1.000, 0.930, 0.728, and 1.000, respectively. Presumed or probable OS showed lower sensitivity and higher specificity when compared with the best Youden index.Conclusion: The revised IWOS criteria are useful in Japanese patients, but could possibly be improved by modifying the criterion of presumed or probable OS.

Recommendations for the management of ocular sarcoidosis from the International Workshop on Ocular Sarcoidosis.

AIMS: To establish expert recommendations for the management of ocular sarcoidosis (OS). METHODS: A question-based survey on the management of OS was circulated to international uveitis experts (members of the International Uveitis Study Group and the International Ocular Inflammation Society) electronically. Subsequently, a consensus workshop was conducted at the 7th International Workshop on Ocular Sarcoidosis (IWOS) in June 2019 in Sapporo, Japan as part of the Global Ocular Inflammation Workshops. Statements on the management of OS that were supported by a two-thirds majority of 10 international panel members of the workshop, after discussion and voting, were taken as consensus agreement. RESULTS: A total of 98 participants from 29 countries responded to the questionnaire survey. The subsequent consensus workshop established recommendations for the management of OS in five sections. The first section concerned evaluation and monitoring of inflammation. The second, third and fourth sections described ocular manifestations that were indications for treatment, and the management of anterior uveitis, intermediate uveitis and posterior uveitis. In the fifth section, the use of systemic corticosteroids and systemic immunosuppressive drugs were detailed. CONCLUSIONS: Recommendations for management of OS were formulated through an IWOS consensus workshop.