Diagnostic hysteroscopy is the gold standard for examination of the uterine cavity. diagnostic hysteroscopy can be performed without anaesthesia: "office hysteroscopy" makes the procedure less demanding.this safe and well-tolerated procedure has not yet found its place in infertility investigations with normal ultrasound, which is an extension of the clinical examination in gynecology.Our book is divided into two parts: a theoretical section outlining the intra-cavity anomalies that impair fertility. Among these lesions, there are those that escape ultrasound and hysterosalpingography, the treatment of which could improve pregnancy outcomes; and a practical section prospectively studying a sample of 349 patients.