desmoplastic small round cell tumor ( dsrct ) is an extremely rare sarcomatous tumor , which is most commonly seen in men . clinicians managing a patient with a rapidly enlarging mass in pregnancy should be aware of the risk for malignancy . a 31-year - old woman was found to have a newly enlarged ovarian mass in the second trimester . she subsequently underwent a laparotomy for removal , with chemotherapy for presumed poorly differentiated ovarian malignancy . ultimately she was diagnosed with a desmoplastic small round cell tumor of the ovary and had progression at time of delivery . she has completed 12  cycles of intensive chemotherapy and is alive with disease at 14  months . care should be taken not to delay evaluation of a rapidly enlarging mass in pregnancy . while this tumor type is extremely rare , a malignancy in pregnancy must be ruled out in this clinical scenario . the authors of this manuscript report no conflict of interest with regard to the subject matter at hand .
backgrounddesmoplastic small round cell tumor ( dsrct ) is an extremely rare sarcomatous tumor , which is most commonly seen in men . 
 clinicians managing a patient with a rapidly enlarging mass in pregnancy should be aware of the risk for malignancy.casea 31-year - old woman was found to have a newly enlarged ovarian mass in the second trimester . 
 she subsequently underwent a laparotomy for removal , with chemotherapy for presumed poorly differentiated ovarian malignancy . 
 ultimately she was diagnosed with a desmoplastic small round cell tumor of the ovary and had progression at time of delivery . 
 following cesarean delivery , she had a tumor reductive surgery . 
 she has completed 12  cycles of intensive chemotherapy and is alive with disease at 14  months.conclusioncare should be taken not to delay evaluation of a rapidly enlarging mass in pregnancy . while this tumor type is extremely rare , a malignancy in pregnancy must be ruled out in this clinical scenario .