Multicenter cross-sectional observational study with the aim of investigating the prevalence of diastasis recti abdominis in adults and identifying its risk factors. Secondary outcoms: * identify the presence of possible risk factors for diastasis recti abdominis * evaluate the insertion of the aponeurosis of the internal oblique muscle in the semilunar line in abdominal CT in a large series of patients * investigate the prevalence of the presence of only the posterior insertion of the internal oblique aponeurosis * evaluate the correlation of the presence of only the posterior lamella with the diastasis recti abdominia and with the pathology of the abdominal wall (ventral and/or incisional hernia) * evaluate the correlation between diastasis and other anatomo-radiological findings, such as the thickness of the rectus muscles and the distance between the lateral edge of the rectus muscles with the medial edges of the lateral abdominal muscles (external oblique, internal oblique and transverse) * evaluate the variability of the results
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Prevalence of diastasis
Timeframe: 2 years