Splenic artery aneurysm is a rare condition with a prevalence of less than 1% in the general population and is more common in women; however, it is the third most common cause of intra-abdominal aneurysms and the most common among visceral arterial aneurysms 1 . This condition was first described by Beussier in 1770; some of the risk factors often described are: fibrodysplasia, portal hypertension, splenomegaly, cirrhosis of the liver, liver transplant, pancreatitis, vasculitis, infectious mononucleosis, and pregnancy [1][2][3][4][5][6] . Pregnancy is considered the most important risk factor for the rupture of this aneurysm, but the true prevalence of this event is unknown 2 . Increased splanchnic and splenic circulation during pregnancy has been indicated as one of the main factors in the development of aneurysms. The modifications in circulation induced by estrogen and progesterone during pregnancy may also contribute to weakening blood vessel walls, especially at the bifurcations. It is speculated that the greater the woman's parity the greater the risk of development and rupture of the aneurysm, due to the successive stresses to which the vessel wall is submitted 3 . The importance of an adequate diagnosis and management of this condition, despite its low prevalence, is supported by the high rates of maternal and fetal mortality, 75 and 95%, respectively 3 .
CLINICAL CASEA 38-year-old pregnant woman with 41 weeks of gestational age and two previous vaginal deliveries without complications or known comorbidities was admitted to the obstetrical center of Hospital de Clínicas de Porto Alegre and treated according to a protocol for post-term pregnancy.At admission, the patient had a cervical dilation of 2 cm and weak uterine contractions, and cardiac-fetal heart rate was normal. After using intravenous oxytocin for 2 hours, in an infusion pump at a concentration of 10 mU/min, she presented a dynamic of three contractions in 10 min and was 5 cm dilated. Two hours later, during non-pharmacological approaches to relieve pain (bath in labor), she presented with strong abdominal pain, dyspnea, dizziness, and paleness. The medical team was called for assessment. At vaginal palpation amniorrhexis and complete cervical dilation were diagnosed, and the patient was sent to the delivery room in the expulsion stage.In the delivery room her dyspnea, respiratory effort, and hypotension became worse. She was submitted to orotracheal intubation and invasive measurement of arterial pressure by the anesthesia team, and volemic replacement was started. The delivery was performed with a left mediolateral episiotomy and fetal extraction with Simpson's forceps. A female baby was born weighing 3705 g and with Apgar scores of 2/6/9 in the 1st, 3rd and 5th minutes, respectively, and sent directly to the care of the Neonatal Unit. Umbilical cord blood gas showed a fetal pH of 6.9. Immediately after delivery, the rapid response team (RRT) was called and the patient was sent to the intensive care unit (ICU) on mechanical ventilation. A be...