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Conductive hearing loss due to middle ear masses is uncommon and usually diagnosed after biopsy. We present a case of a permanent facial palsy occurred following an uneventful biopsy during an exploratory tympanotomy in a salivary gland choristoma of the middle ear. Most salivary gland choristomas have been found in the head and neck. Its location in the ear is extremely rare, and thus we present the 38th case in English and non-English literature from the first publication by Taylor in 1961. Complete surgical removal of salivary gland choristomas of the middle ear is indicated when may not result in permanent damage to the facial nerve. Only biopsy and observation are recommended when the mass is intimately associated with the facial nerve or there are unsafe facial nerve abnormalities. Although the facial nerve is involved in 40% of cases, transient or even permanent facial palsies are exceptional. The reactivation of latent herpes virus in the facial canal may be involved in facial palsy' etiology following minimal and uneventful middle ear surgery like a biopsy rather than nerve injury related to facial canal malformations.

Authors have calculated the H/V spectral ratios using seismic-noise recordings in the uppermost layers north of the Seymour-Marambio Island, Antarctic. Sixty-seven seismic site-response measurements near and far from the Argentinean Marambio Base runway suggest geotechnical works on the uppermost sedimentary layers due to maintenance, landing, and taxi of large loads and aircraft during decades could contribute to changes in their seismic dynamic response. Two horizontal images of Vp, Vs, and Vp/ Vs ratios at 1.0 m and 35.0 m depth show lateral variations in the permafrost properties. Authors interpret that permafrost is emplaced in rocks with different porosities and contrasting fluids saturation at those depths. In shallow strata, the saturation of gases affects mainly the elastic properties. In deeper strata, where the location of water reservoirs is detected, the primary mechanism of seismic dissipation is anelastic.

La enfermedad por el SARS CoV-2 (COVID-19) ha provocado millones de casos desde que se declarase el estado de pandemia por la Organización Mundial de la Salud (OMS) en marzo de 2020, cambiando las prácticas médicas y quirúrgicas habituales. Los sanitarios representan un importante porcentaje de la población general contagiada. Entre ellos, destaca el especial riesgo de infección en otorrinolaringólogos y cirujanos de cabeza y cuello (ORL), debido a la cercanía a la vía aérea superior y al riesgo de generación de bioaerosoles durante los procedimientos. El objetivo de este artículo es la elaboración de un documento de práctica otorrinolaringológica segura durante la pandemia COVID19, basado en una recopilación de la mejor evidencia adaptada al riesgo de transmisión, según la combinación de los resultados de los indicadores de riesgo establecidos por el Ministerio de Sanidad, Consumo y Bienestar Social (MSCBS). El presente documento es fruto de la colaboración de las comisiones científicas y del comité COVID-19 de la SEORLCCC.

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