Abstract
Follicular dendritic cell sarcoma (FDCS) is a rare neoplasm of mesenchymal origin arising from B-cell follicles, typically presenting as a painless, slow-growing mass. According to the available literature, this is only the second reported case of FDCS during pregnancy and the first associated with fetal growth restriction and preeclampsia. A 30-year-old pregnant woman at 28 weeks of gestation was diagnosed with preeclampsia and fetal growth restriction, during which an incidental abdominal mass was identified on ultrasound. Excisional surgery was performed 27 days after an emergency cesarean delivery, and histopathological analysis confirmed FDCS arising in association with hyaline-vascular type Castleman disease. This case highlights the importance of multidisciplinary evaluation and awareness of rare abdominal neoplasms during pregnancy.