Author(s)

Shizue Fujihara¹, Teruyuki Yamasaki¹, Kontoku Shimokawa², Han-Seung Yoon³

¹Department of Obstetrics and Gynecology, Iida Municipal Hospital, Iida, Japan.
²Saint John of God Hospital Ballarat, Ballarat, Australia.
³Anatomic Pathology, Iida Municipal Hospital, Iida, Japan.

Extraskeletal osteosarcoma (ESO) is a rare malignant mesenchymal neoplasm accounting for 1% - 2% of all soft tissue sarcomas that produce osteoid, bone, and/or chondroid material. Here we report the first case of a retroperitoneal ESO in a 35-year-old pregnant woman. A retroperitoneal ESO was incidentally found at cesarean section. Despite treatment, she rapidly died from wide spread dissemination. We focus on histological characteristics including immunohistochemical results and differential diagnosis of ESO.

Extraskeletal Osteosarcoma, Pregnant Woman, MDM2, CDK4

Fujihara, S. , Yamasaki, T. , Shimokawa, K. and Yoon, H. (2016) Retroperitoneal Extraskeletal Osteosarcoma in a Pregnant Woman Incidentally Found on Cesarean Section. Open Journal of Pathology, 6, 14-18. doi: 10.4236/ojpathology.2016.61003.