What does endometrial type C mean?

Jul 03, 2025 Source: Cainiu Health
Dr. Zhang Lu
Introduction
Under normal circumstances, endometrial pattern C refers to a specific morphological type of endometrium, classified based on its echogenicity and thickness during B-ultrasound examination. Generally, pattern C endometrium represents a normal manifestation during the physiological cycle; however, in assisted reproductive technology, doctors will evaluate the likelihood of embryo implantation by considering its morphology.

Generally, endometrial pattern C refers to a specific morphology of the endometrium, classified based on ultrasound examination according to the echogenicity and thickness of the endometrium. Detailed analysis is as follows:

Endometrial pattern C is a classification used during ultrasound evaluation of endometrial morphology. It typically describes a disappearance of the endometrial line, indistinct boundary between the endometrial cavity echo and the myometrial echo, and an overall homogeneously hyperechoic appearance. This morphology is commonly seen during the secretory phase of the menstrual cycle, when the endometrium continues to thicken under the influence of progesterone. The glands are actively secreting, stromal edema is present, and due to the uniform composition of the endometrial tissue rich in mucus and blood vessels, it appears as a homogeneously hyperechoic structure with reduced echogenic difference compared to the myometrium on ultrasound.

In general, pattern C endometrium represents a normal physiological manifestation during the menstrual cycle. However, in assisted reproductive technologies, doctors may assess embryo implantation potential by combining the morphological features of the endometrium. If abnormal pattern C endometrium appears outside the menstrual period or is accompanied by other symptoms, further evaluation is needed to rule out possible endometrial hyperplasia, polyps, or other pathological conditions.

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