Erdheim-Chester Disease Revealed by Central Positional Nystagmus: A Case Report.

Erdheim-Chester disease (ECD) is a rare histiocytic disorder, recently recognized to be neoplastic. The clinical phenotype of the disease is extremely heterogeneous, and depends on the affected organs, with the most frequently reported manifestations being bone pain, diabetes insipidus and neurological disorders including ataxia. In this article, we report on a case of a 48-year-old woman, whose initial symptom of gait instability was isolated. This was associated with positional nystagmus with central features: nystagmus occurring without latency, clinically present with only mild symptoms, and resistant to repositioning maneuvers. The cerebral MRI showed bilateral intra-orbital retro-ocular mass lesions surrounding the optic nerves and T2 hyperintensities in the pons and middle cerebellar peduncles. A subsequent CT scan of the chest abdomen and pelvis found a left "hairy kidney", while 18 F-FDG PET-CT imaging disclosed symmetric 18F-FDG avidity predominant at the diametaphyseal half of both femurs. Percutaneous US-guided biopsy of perinephric infiltrates and the kidney showed infiltration by CD68(+), CD1a(-), Langerin(-), PS100(-) foamy histiocytes with BRAF V600E mutation. The combination of the different radiological abnormalities and the result of the biopsy confirmed the diagnosis of ECD. Many clinical and radiological descriptions are available in the literature, but few authors describe vestibulo-ocular abnormalities in patients with ECD. Here, we report on a case of ECD and provide a precise description of the instability related to central positional nystagmus, which led to the diagnosis of ECD.

Study of the Comorbidity Between Cases of Acute Peripheral Vestibulopathies and COVID-19.

IMPORTANCE: An infective etiology of acute peripheral vestibulopathy (APV) has long been hypothesized. In the context of coronavirus disease 2019 (COVID-19), we examined the possible comorbidity between these two entities. OBJECTIVES: APV is the second most common cause of vestibular disorders and results from a sudden and unilateral loss of vestibular inputs. The characteristic signs and symptoms include sudden and prolonged vertigo, absence of auditory symptoms, and absence of other neurological symptoms. An infective etiology of APV has long been hypothesized on the basis of its association with respiratory tract infections and its frequent occurrence in epidemics. Possible comorbidity with herpes simplex virus type 1 reactivation or influenza virus infection has also been proposed. This study was designed to assess the possible comorbidity between APV and COVID-19. DESIGN/SETTING/PARTICIPANTS: Quantification of the number of hospital admissions for APV over the period from February to May 2020 was carried out in 5 French hospitals. A comparison with 2018 and 2019 entries over the same period was made. Comorbidity between APV and COVID-19 infection was investigated. RESULTS: No significant increase in admission for APV was noticed over the examination period. No significant difference was noticed among hospitals located in COVID-19 high- and low-risk zones for SARS-CoV-2. No significant increase in the severity of the APV cases was noticed. No case of comorbidity between APV and SARS-CoV-2 infection was reported. Based on our observations, no correlation was made between APV and COVID-19. CONCLUSION: Based on our observations, COVID-19 is not statistically correlated with APV.

Drug-Induced Hearing Loss in Children: An Analysis of Spontaneous Reports in the French PharmacoVigilance Database.

INTRODUCTION: Hearing loss can have a negative impact on communication, with significant vocational, educational, and social consequences. Drugs are one of the causes of hearing loss in children. OBJECTIVES: The objective of our study was to describe drug-induced hearing loss in the pediatric population. METHODS: Reports of hearing loss from 1985 to December 2019 in the pediatric population (< 18 years) were extracted from the French PharmacoVigilance Database (FPVD). We performed a retrospective and descriptive analysis of adverse drug reaction (ADR) reports. RESULTS: A total of 70 ADR reports were identified among the 51,216 reports registered in the FPVD, 37 involving adolescents (12-17 years, 52.9%), 28 children (2-11 years, 40.0%), and 5 infants (28 days-23 months, 7.1%). Overall, 40 reports (57.1%) involved girls. A total of 56 reports (80.0%) were "serious." The most frequent hearing disorders were deafness (n = 31, 44.3%) and hypoacusis (n = 22, 31.4%). Suspected drugs (ATC 5th level) were amikacin (n = 11, 15.7%), cisplatin (n = 11, 15.7%), doxorubicin (n = 4, 5.7%), vincristine (n = 4, 5.7%), clarithromycin (n = 4, 5.7%), ceftriaxone (n = 3, 4.3%), isotretinoin (n = 3, 4.3%), and vancomycin (n = 3, 4.3%). CONCLUSIONS: This study shows that about three out of four cases of drug-induced hearing loss in the pediatric population were "serious". It also underlines the under-reporting of these ADRs and the importance of strengthening hearing monitoring in children during and long after drug exposure.

In utero drug exposure and hearing impairment in 2-year-old children A case-control study using the EFEMERIS database.

INTRODUCTION: As the ear development extends from the 4th to the 30th week of pregnancy, in utero exposure to ototoxic drugs might lead to hearing impairment in the fetus. The main study objective was to assess the association between in utero drug exposure and the occurrence of hearing impairment in 2-year-old children. METHODS AND MATERIALS: A case-control study was carried out using the EFEMERIS database, recording medications dispensed during pregnancy and the compulsory health certificates for child at 8 days, 9 and 24 months. Cases were defined as children with an abnormal hearing examination recorded on the 24-month certificate and controls as children with a normal hearing examination. Exposure was defined as at least one prescription and dispensation to the mother of drugs grouped at the 3rd level of the Anatomical Therapeutic and Chemical Classification level, compared to no exposure. Univariate logistic regressions were carried out. If the 95% confidence interval (95% CI) of the odds ratio (OR) was significant, a multivariable logistic regression was performed, adjusted on confounders. RESULTS: A total of 1,245 cases with abnormal hearing evaluation and 28,046 controls were selected for analysis. Case and control mothers were comparable in terms of age, education and congenital infection. Cases and controls were comparable in terms of prematurity, asphyxia and weight at birth. However, among cases (versus controls), there were more ear deformities (0.6% vs 0.0% p≤0.001), and more recurring otitis (11.3% vs 5.3% p≤0.0001). When adjusted on confounders, the following drugs remained significant versus no exposure: acetylsalicylic acid at low dosage (OR 95% CI 1.61 [1.09-2.37]), valproic acid or valpromide (OR 95% CI 5.20 [1.93-14.00]), systemic corticosteroids (OR 95% CI 0.75 [0.61-0.93]. In a sensitivity analysis which excluded children with recurrent otitis at 24 months, these three results remained significant. CONCLUSIONS: This is the first study evaluating the risk of hearing disorders due to in utero exposure to drugs. Hearing loss was associated with valproic acid and low-dose acetylsalicylic acid exposure during pregnancy. Conversely, children with normal hearing were more likely to have been exposed in utero to corticosteroids than children with hearing loss.