The MUSA (Morphological Uterus Sonographic Assessment) statement is a consensus statement on terms, definitions and measurements that may be used to describe and report the sonographic features of the myometrium using gray-scale sonography, color/power Doppler and three-dimensional ultrasound imaging. The terms and definitions described may form the basis for prospective studies to predict the risk of different myometrial pathologies, based on their ultrasound appearance, and thus should be relevant for the clinician in daily practice and for clinical research. The sonographic features and use of terminology for describing the two most common myometrial lesions (fibroids and adenomyosis) and uterine smooth muscle tumors are presented.

Submucous leiomyomas or myomas are commonly encountered by gynecologists and specialists in reproductive endocrinology and infertility with patients presenting with 1 or a combination of symptoms that include heavy menstrual bleeding, infertility, and recurrent pregnancy loss. There exists a variety of interventions that include those performed under hysteroscopic, laparoscopic and laparotomic direction; an evolving spectrum of image guided procedures, and an expanding number of pharmaceutical agents, each of which has value for the appropriately selected and counseled patient. Identification of the ideal approach requires the clinician to be intimately familiar with a given patient\'s history, including her desires with respect to fertility, as well as an appropriately detailed evaluation of the uterus with any one or a combination of a number of imaging techniques, including hysteroscopy. This guideline has been developed following a systematic review of the evidence, to provide guidance to the clinician caring for such patients, and to assist the clinical investigator in determining potential areas of research. Where high level evidence was lacking, but where a majority of opinion or consensus could be reached, the guideline development committee provided consensus recommendations as well.

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Modern imaging techniques allow non-invasive diagnosis of adenomyosis, a relatively common disorder characterized by the presence of heterotopic endometrial glands and stroma in the myometrium with hyperplasia of the adjacent smooth muscle. The study of adenomyosis is greatly hampered by a lack of clear terminology and the absence of a consensus classification of the lesions. Any classification of adenomyosis must begin with an evaluation of the myometrium underlying the endometrium, the so-called junctional zone, since homogeneous thickening of this zone has become the standard criterion for non-invasive diagnosis. Although transvaginal sonography is useful for the detection of adenomyosis, the technique is highly operator dependent. Magnetic resonance imaging provides superior soft tissue resolution and currently represents the most accurate technique for non-invasive diagnosis. Adenomyosis represents a spectrum of lesions, ranging from increased thickness of the junctional zone to overt adenomyosis and adenomyomas, which in turn can be subclassified. It is increasingly recognized that adenomyosis is often associated with pelvic endometriosis yet the contribution of myometrial lesions to clinical symptoms, such as infertility and pain, remains poorly understood. Moreover, recent studies indicate that adenomyosis is a progressive disease that changes in appearance during the reproductive years. A consensus classification of uterine adenomyosis is urgently required.