Abstract
BACKGROUND: Retroperitoneal ectopic pregnancy is extremely rare. This unusual location represents a great challenge for clinicians due to the difficulties of diagnosis and high risk of life-threatening complications. CASE REPORT: We report the case of a spontaneous early pregnancy of undetermined location in a patient with a history of previous laparoscopic surgery. Diagnosis steps using clinical examination, ultrasound, and magnetic resonance imaging led to the localization of the pregnancy, in the left side of the para-aortic region, in the retroperitoneal space. CONCLUSION: Retroperitoneal ectopic pregnancy is an uncommon entity with rather complex pathogenesis. Clinicians should carefully interpret clinical signs, biological findings, and imaging features and be aware of unusual locations such as the retroperitoneum for ectopic pregnancies. Early diagnosis and appropriate management strategy are conditio sine qua non for successful treatment outcomes.