Scar pregnancy is a rare but serious form of ectopic pregnancy that is life-threatening and functional. Its actual incidence remains undetermined, but the increase in published cases over the past ten years testifies to the increased vigilance of obstetrician-gynecologists on ultrasound diagnosis, which remains the first-line examination. To date, there is no consensus on a reference treatment. We report our experience of a case of pregnancy on caesarean section scar in a 36-year-old patient treated in our department. The diagnosis was suspected in the presence of metrorrhagia associated with pelvic pain in the first trimester of pregnancy. Ultrasound confirmed the diagnosis and treatment consisted of surgical cure by laparotomy. The objective was to discuss the epidemiological, physiopathological, diagnostic aspects, the therapeutic and evolutionary modalities of this rare pathology.