Antunes, D., Marques, F., Santos Silva, I. and Branco, M. 2023. Spontaneous Monochorionic Quadramniotic Pregnancy: A Rare and Challenging Diagnosis. Acta Médica Portuguesa. 36, 4 (Apr. 2023), 300–302. DOI:https://doi.org/10.20344/amp.19283.