Aim: Placental chorioangioma is a rare cause for polyhydramnios which is often missed among its differential diagnosis, leading to grave fetomaternal complications. This case report aims to provide insight, that, despite their rarity, placental tumors are a potential cause for fetomaternal complications. Background: Chorioangioma is a nontrophoblastic benign vascular tumor leading to maternal complications and fetal complications. Timely diagnosis and intervention help improve fetomaternal outcomes. Case description: A 29-year-old, second gravida at 29 weeks 5 days gestation was admitted to labor room with preterm labor pains, history of a gush of watery discharge per vaginum, severe respiratory embarrassment, and bilateral lower limb edema. On per abdomen examination, liquor was increased, and the abdomen was distended up to xiphisternum. Ultrasonography revealed hyperechoic lesion approximately 6.6 x 4 cm arising from the placenta, suggestive of chorioangioma placenta. She delivered vaginally a live male baby weighing 1.9 kg. The baby had respiratory distress and was kept in neonatal intensive care unit on continuous positive airway pressure (CPAP) mode of ventilation. The woman had a bout of postpartum hemorrhage necessitating blood transfusion. Placental examination revealed lobular purplish red growth attached with a pedicle to the fetal surface of the placenta. Histological examination showed an angiomatous pattern of chorioangioma. As she presented late, we had no scope of providing conservative management for better fetomaternal prognosis. Conclusion: Adverse fetomaternal outcome in case of large chorioangioma warrants timely diagnosis and intervention. Clinical significance: Though rare, placental tumors must be considered as a differential diagnosis in cases of polyhydramnios.