<p><strong>Resumen</strong></p><p>El signo del halo invertido se caracteriza por una opacidad central de vidrio esmerilado rodeado por una consolidación del espacio aéreo más densa en forma de una media luna o un anillo. El signo del halo invertido se ha informado en asociación con un amplia gama de enfermedades pulmonares, incluidas las infecciones fúngicas pulmonares invasivas, neumonía por pneumocystis, tuberculosis, neumonía adquirida en la comunidad, granulomatosis linfomatoide, granulomatosis de Wegener, neumonía lipoidea y sarcoidosis. También se observa en neoplasmas pulmonares e infarto y después de radioterapia y ablación por radiofrecuencia de neoplasias malignas pulmonares. También es conocido como signo de halo en reversa o signo del atolón.</p><p><strong>Abstract</strong></p><p>The reversed halo sign is characterized by a central ground-glass opacity surrounded by denser air–space consolidation in the shape of a crescent or a ring. The reversed halo sign has been reported in association with a wide range of pulmonary diseases, including invasive pulmonary fungal infections, pneumocystis pneumonia, tuberculosis, community-acquired pneumonia, lymphomatoid granulomatosis,Wegener granulomatosis, lipoid pneumonia and sarcoidosis. It is also seen in pulmonary neoplasms and infarction, and following radiation therapy and radiofrequency ablation of pulmonary malignancies. It is also known as a reverse halo sign or atoll sign.</p>
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