Editing Surface epithelial-stromal tumor (section)

===Mucinous tumors===
[[File:Histopathology of lining of a benign mucinous tumor of the ovary.jpg|thumb|Histopathology of lining of a benign mucinous tumor of the ovary. Benign mucinous ovarian tumors consist of simple, nonstratified columnar epithelium with basally-located hyperchromatic nuclei and resemble gastric foveolar epithelium.<ref name=Baradwan2018>{{cite journal|last1=Baradwan|first1=Saeed|last2=Alalyani|first2=Haneen|last3=Baradwan|first3=Amira|last4=Baradwan|first4=Afnan|last5=Al-Ghamdi|first5=Maram|last6=Alnemari|first6=Jameel|last7=Al-Jaroudi|first7=Dania|title=Bilateral ovarian masses with different histopathology in each ovary|journal=Clinical Case Reports|volume=6|issue=5|year=2018|pages=784–787|issn=2050-0904|doi=10.1002/ccr3.1466|pmid=29744056|pmc=5930217}}<br>- [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) license]</ref>]]
[[Mucinous tumor]]s:
*Closely resemble their serous counterparts but unlikely to be bilateral
*Somewhat less common, accounting for about 25% of all ovarian neoplasms
* In some cases mucinous tumors are characterized by more cysts of variable size and a rarity of surface involvement as compared to serous tumors	
*Also in comparison to serous tumors, mucinous tumors are less frequently bilateral, approximately 5% of primary mucinous tumors are bilateral.
*May form very large cystic masses, with recorded weights exceeding 25&nbsp;kg

====Pathology====
Mucinous tumors are characterized by a lining of '''tall columnar epithelial cells''' with apical mucin and the absence of cilia, similar in appearance with benign cervical or intestinal epithelia.  The appearance can look similar to colonic or ovarian cancer, but typically originates from the appendix (see [[mucinous adenocarcinoma]] with clinical condition [[Pseudomyxoma peritonei]]). Clear stromal invasion is used to differentiate borderline tumors from malignant tumors.

====Prognosis====
10-year survival rates for [[borderline tumor]]s contained within the ovary, malignant tumors without invasion, and invasive malignant tumors are greater than 95%, 90%, and 66%, respectively. One rare but noteworthy condition associated with mucinous ovarian neoplasms is [[pseudomyxoma peritonei]]. As primary ovarian mucinous tumors are usually unilateral (in one ovary), the presentation of bilateral mucinous tumors requires exclusion of a non-ovarian origin, usually the appendix.