Non-evolving intrauterine pregnancy, also referred to as a missed miscarriage or non-viable pregnancy, occurs when an embryo implants inside the uterus but fails to develop or grow as expected. Despite the initial signs of pregnancy, such as missed periods or positive pregnancy tests, the embryo does not progress, which can be emotionally challenging for expectant parents. From my personal experience and from reading medical sources, the most common cause is chromosomal abnormalities in the embryo, which prevent proper development. Sometimes hormonal imbalances or maternal health factors may also contribute. The diagnosis often happens during a routine ultrasound when no fetal heartbeat or growth is detected despite the pregnancy seeming established. It is important to consult a healthcare professional for accurate diagnosis and guidance. They may recommend monitoring or medical intervention such as medication or minor procedures to safely resolve the pregnancy. Emotional support and counseling can be essential during this time to cope with the loss. Understanding the terminology is key: "grossesse intra utérine non évolutive" in French literally translates to "non-evolving intrauterine pregnancy," describing precisely this situation. Awareness and early diagnosis help manage expectations and medical decisions effectively. Remember, a non-evolving pregnancy is not your fault and can happen even in healthy women trying to conceive. Seeking support and clear medical advice is crucial to navigate through this experience.