An Unusual Case of Urachal Cyst Misdiagnosed as a Paraovarian Cyst: Ultrasound Assessment and Differential Diagnosis

The urachus is an embryologic remnant of the cloaca that usually degenerates after birth, resulting from the obliteration of the allantois, whose role is to connect the bladder to the umbilicus.Incomplete removal of the lumen may give rise to different malformations of the median umbilical ligament after birth.Although in the pediatric population u

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Disease misclassification in electronic healthcare database studies: Deriving validity indices-A contribution from the ADVANCE project.

There is a strong and continuously growing interest in using large electronic vista 5 vl5 healthcare databases to study health outcomes and the effects of pharmaceutical products.However, concerns regarding disease misclassification (i.e.classification errors of the disease status) and its impact on the study results are legitimate.Validation is th

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