Any uterine bleeding outside the normal volume , duration, regularity or frequency is considered Abnormal uterine bleeding (AUB).AUB is the most common and distressing gynaecological complaint of women attending gynaecological consultation.It is used to classify AUB on the basis of etiology-Polyp, Adenomyosis, Leiomyoma, Malignancy, Coagulopathy, Hyperplasia, Ovulatory dysfunction, Endometrial, Iatrogenic and Not yet classified .Primary disorders of the endometrium are common causes of AUB in both perimenopausal and postmenopausal women. The histopathology pattern of endometrium include proliferative pattern, secretory pattern, simple hyperplasia, complex hyperplasia, atrophic endometrium and disordered proliferation. Endometrial carcinoma is one of the common cause of postmenopausal bleeding. The endometrium is evaluated by Trans Vaginal ultrasound (TVS), Hysteroscopy and endometrial biopsy. Endometrial sample is obtained by fractional curettage and office endometrial biopsy using Pipelles’ aspirator. The present study is designed to evaluate the endometrial pattern on histopathology and to correlate the endometrial thickness by Transvaginal Ultrasound and endometrial pattern in perimenopausal women with AUB. This is a retrospective study conducted in Annapoorana Medical College and Hospital, Salem from December 2016 to November 2018. Women presenting with Abnormal uterine bleeding who underwent Endometrial sampling and Trans Vaginal Ultrasound as initial part of management is taken for the study. Endometrial sampling was obtained either by fractional curettage or office endometrial biopsy in our institution. Endometrial thickness was obtained by transvaginal ultrasound using 7.5 MHZ transvaginal transducer before obtaining endometrial sampling. Observations were made and the results were analysed to find the correlation between endometrial thickness and study the endometrial pattern