Diagnosis of diffuse adenomyosis by means of conventional techniques and pelvic examination is still unsatisfactory. Adenomyosis is quite a common disease that causes pelvic pain and menorrhagia in the premenapausal group of women. A thirty-nine years old female patient with severe pelvic pain and menorrhagia was examined by transvaginal ultrasonography. The findings of transvaginal ultrasonography, correlated with the pathology report is presented in this paper. Anechoic heterogenous areas in the myometrium have raised the question of adenomyosis. Pathological findings of the hysterectomy specimen were in accordance with the ultrasonography findings, which may lead to a new era in the diagnosis of adenomyosis.