TY - JOUR T1 - Primary peritoneal mucinous cystadenocarcinoma mimicking possible recurrent ovarian mucinous cystadenoma: coincidental pathology or a spectrum of disease? JF - BMJ Case Reports JO - BMJ Case Reports DO - 10.1136/bcr-2021-242478 VL - 14 IS - 7 SP - e242478 AU - Claire Filippini AU - Sarah Smyth AU - Hooman Soleymani Majd AU - Catherine Johnson Y1 - 2021/07/01 UR - http://casereports.bmj.com/content/14/7/e242478.abstract N2 - We present the case of a 32-year-old woman with a previous surgical history of benign mucinous cystadenoma resected in 2012 who underwent magnetic resonance cholangiopancreatography following her second pregnancy in 2020. This demonstrated a large cystic mass in the left subdiaphragmatic space. Histopathology confirmed a well-differentiated primary peritoneal mucinous cystadenocarcinoma displaying cells of a Mullerian origin. We subsequently discuss the aetiology of these conditions separately and explore the possibility of a connection between the two regarding origin or potential malignant transformation that may otherwise have occurred coincidentally in this young patient. We also acknowledge a paucity of evidence regarding subsequent management strategies. ER -