This analytical cross sectional study was approved in October 2008 to evaluate the role of endometrial dying with methyline blue during diagnostic hysteroscopy to detect new subtle histopathologies missed by the conventional hysteroscopy.100 patients were included in the study complaining of perimenopausal bleeding with no diagnosed hysteroscopic endometrial abnormalities nor a general bleeding tendency.Endometrial dying was done by instillation of 5 ml of 1% methyline blue into the endometrial cavity after diagnostic hysteroscopy. According to the pattern of methyline blue staining , 60 patients showed focal dark staining with a background of light blue stained endometrium forming group I, the remaining 40 patients showed diffuse blue staining forming group II . Group I was further subdivided into group A , B according to the age with group A (40-46 years) and group B (>46 years).The chromoendoscopy procedure led to the diagnosis of 48 more new endometrial histopathologies missed by conventional diagnostic hysteroscopy and even random endometrial curettage ., 16 cases of atrophic endometritis,29 cases of simple endometrial hyperplasia and 3 cases of atypical endometrial hyperplasia with a very significant detection value for the former and the latter hitopathologies respectively.Patients and methods: This study was conducted on 30 consecutive patients at the Cardiac Surgery Department, Mauriziano Umberto I Hospital, Torino, Italy ,for whom surgical interference was performed for acute type “A” Aortic Dissection. They included 21 (70%) male patients and 9 (30%) female patients with a mean age of 62 ± 10.8 years.Results: The peak of incidence was in winter (January) & least incidence in summer. The most significant risk factor was hypertension [29 (96.7%) of the patients]. All patients were admitted as emergency cases, 50% of them were in critical state. The majority of these patients (66.7%) were operated for Ascending Aortic replacement solely while the rest had some kind of modification beside the ascending Aorta (valve replacement or repair, Modified Bentall De Bano, or hemiarch replacement). The mean bypass time was 187.1 ± 60.9 minutes, with mean Aortic cross clamp time of 96.8 ± 36.7 minutes and total circulatory arrest time of 26.8 ± 10 minutes and mean temperature of arrest 20.1 ± 2.5 ˚C. The mean ICU stay was 4.66 ± 3.7 days. The mean hospital stay was 11.3 ± 1.4 days with overall mortality of 30% after 24 months of follow up.Conclusion: Early Diagnosis of Acute type “A” Aortic Dissection is empirical for less complications & better operative & post-operative results