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Primary myxoid pulmonary sarcoma is a rare entity with an endobronchial growth. Although it should be included in the differential diagnosis of other sarcomas, its prognosis is usually favorable. We present the case of a 51-year-old patient with a mesenchymal tumor in the right lung, diagnosed as a primary pulmonary myxoid sarcoma, positive for EMA, vimentine and with a Ki-67 less than 5%; FISH revealed a EWSR1-CREB1 translocation.

Liver transplantation is the only curative treatment option in patients diagnosed with end-stage liver disease. The low availability of organs demands an accurate selection procedure based on histological analysis, in order to evaluate the allograft. This assessment, traditionally carried out by a pathologist, is not exempt from subjectivity. In this sense, new tools based on machine learning and artificial vision are continuously being developed for the analysis of medical images of different typologies. Accordingly, in this work, we develop a computer vision-based application for the fast and automatic objective quantification of macrovesicular steatosis in histopathological liver section slides stained with Sudan stain. For this purpose, digital microscopy images were used to obtain thousands of feature vectors based on the RGB and CIE L*a*b* pixel values. These vectors, under a supervised process, were labelled as fat vacuole or non-fat vacuole, and a set of classifiers based on different algorithms were trained, accordingly. The results obtained showed an overall high accuracy for all classifiers (&gt, 0.99) with a sensitivity between 0.844 and 1, together with a specificity &gt, 0.99. In relation to their speed when classifying images, KNN and Naïve Bayes were substantially faster than other classification algorithms. Sudan stain is a convenient technique for evaluating ME in pre-transplant liver biopsies, providing reliable contrast and facilitating fast and accurate quantification through the machine learning algorithms tested.