Focal xanthogranulomatous pyelonephritis in a teenager.
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Biomedical subjects
Publications and source records attributed to J C Hoeffel.
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The Institute of Scientific information has edited an index to evaluate the diffusion of scientific articles. It is based on the fact that the more an article is cited as a reference in other articles, the more it is considered to be important, and the higher the coefficient attributed to the journal in which it was originally published. The impact factor takes into account the average number of times which a journal is mentioned for recent articles published in a given year. This index is an attempt to quantify the notoriety of scientific journal for all scientific medical specialties.
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We describe a unique case of an intra-diploic epidermoid cyst of the parietal and occipital right bone in a 43 year-old man. The tumor remained quiescent for 12 years and then spontaneously showed malignant changes with intra-cerebral involvement. Fatal outcome occurred one year after surgery, radiation therapy and chemotherapy because of a recurrence. Malignant transformation of the epithelium in epidermoid cyst is very rare. Our case is the first one where this transformation occurred spontaneously without previous surgery.