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| {{Main|Well-differentiated papillary mesothelioma}} | | {{Main|Well-differentiated papillary mesothelioma}} |
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| ==Benign multicystic mesothelioma== | | ==Peritoneal inclusion cyst== |
| :Should '''not''' be confused with ''[[malignant mesothelioma]]'' and ''[[benign papillary mesothelioma]]''.
| | {{Main|Peritoneal inclusion cyst}} |
| *[[AKA]] ''peritoneal inclusion cyst''.<ref name=pmid19386139>{{Cite journal | last1 = Vallerie | first1 = AM. | last2 = Lerner | first2 = JP. | last3 = Wright | first3 = JD. | last4 = Baxi | first4 = LV. | title = Peritoneal inclusion cysts: a review. | journal = Obstet Gynecol Surv | volume = 64 | issue = 5 | pages = 321-34 | month = May | year = 2009 | doi = 10.1097/OGX.0b013e31819f93d4 | PMID = 19386139 }}</ref>
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| *[[AKA]] ''inflammatory cyst of the peritoneum''. | | *[[AKA]] ''inflammatory cyst of the peritoneum''. |
| *[[AKA]] ''[[mesothelial inclusion cyst]]''.{{fact}} | | *[[AKA]] ''[[mesothelial inclusion cyst]]''.{{fact}} |
| ===General===
| | *[[AKA]] ''benign multicystic mesothelioma''. |
| *Usually conservative management. | | **Should '''not''' be confused with ''[[malignant mesothelioma]]'' and ''[[benign papillary mesothelioma]]''. |
| *Serum CA-125 usually low.
| | *[[AKA]] ''peritoneal inclusion cyst''.<ref name=pmid19386139>{{Cite journal | last1 = Vallerie | first1 = AM. | last2 = Lerner | first2 = JP. | last3 = Wright | first3 = JD. | last4 = Baxi | first4 = LV. | title = Peritoneal inclusion cysts: a review. | journal = Obstet Gynecol Surv | volume = 64 | issue = 5 | pages = 321-34 | month = May | year = 2009 | doi = 10.1097/OGX.0b013e31819f93d4 | PMID = 19386139 }}</ref> |
| *May occur in men.<ref name=pmid12239771>{{Cite journal | last1 = Cavallaro | first1 = A. | last2 = Murazio | first2 = M. | last3 = Modugno | first3 = P. | last4 = Vona | first4 = A. | last5 = Revelli | first5 = L. | last6 = Potenza | first6 = AE. | last7 = Colli | first7 = R. | title = Benign multicystic mesothelioma of the peritoneum: a case report. | journal = Chir Ital | volume = 54 | issue = 4 | pages = 569-72 | month = | year = | doi = | PMID = 12239771 }}</ref>
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| ===Gross===
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| Features:<ref name=pmid3789251>{{Cite journal | last1 = McFadden | first1 = DE. | last2 = Clement | first2 = PB. | title = Peritoneal inclusion cysts with mural mesothelial proliferation. A clinicopathological analysis of six cases. | journal = Am J Surg Pathol | volume = 10 | issue = 12 | pages = 844-54 | month = Dec | year = 1986 | doi = | PMID = 3789251 }}</ref>
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| *Multilocular thin-walled cysts containing serous fluid +/- blood.
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| **Occasionally unilocular.
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| *May be up to 15 cm.
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| *Can be adherent to the [[ovary]].
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| ===Microscopic===
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| Features:<ref name=pmid19386139/><ref name=pmid18349460>{{Cite journal | last1 = Levy | first1 = AD. | last2 = Arnáiz | first2 = J. | last3 = Shaw | first3 = JC. | last4 = Sobin | first4 = LH. | title = From the archives of the AFIP: primary peritoneal tumors: imaging features with pathologic correlation. | journal = Radiographics | volume = 28 | issue = 2 | pages = 583-607; quiz 621-2 | month = | year = | doi = 10.1148/rg.282075175 | PMID = 18349460 | URL = http://radiographics.rsna.org/content/28/2/583.full}}</ref>
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| *Thin-walled, irregular-shaped, cysts - unicystic or multicystic.
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| **Mesothelial lining +/- squamous metaplasia.<ref name=pmid2766227>{{Cite journal | last1 = Ross | first1 = MJ. | last2 = Welch | first2 = WR. | last3 = Scully | first3 = RE. | title = Multilocular peritoneal inclusion cysts (so-called cystic mesotheliomas). | journal = Cancer | volume = 64 | issue = 6 | pages = 1336-46 | month = Sep | year = 1989 | doi = | PMID = 2766227 }} | |
| </ref>
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| **Eosinophilic fluid.
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| DDx:
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| *[[Ovarian serous borderline tumour]].
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| *[[Ovarian serous carcinoma]].
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| *[[Primary peritoneal serous carcinoma]]. | |
| *Primary peritoneal [[malignant mesothelioma]].
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| Images:
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| *[http://radiographics.rsna.org/content/28/2/583/F30.expansion.html Multicystic mesothelioma (rsna.org)].
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| *[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3445851/figure/F4/ Benign multicystic peritoneal mesothelioma (nih.gov)].<ref name=pmid22583977>{{Cite journal | last1 = Takemoto | first1 = S. | last2 = Kawano | first2 = R. | last3 = Honda | first3 = K. | last4 = Nakazono | first4 = A. | last5 = Shimamatsu | first5 = K. | title = Benign multicystic peritoneal mesothelioma mimicking recurrence of an ovarian borderline tumor: a case report. | journal = J Med Case Rep | volume = 6 | issue = 1 | pages = 126 | month = | year = 2012 | doi = 10.1186/1752-1947-6-126 | PMID = 22583977 }}</ref>
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| ===IHC===
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| Features:<ref name=pmid22583977/>
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| *Calretinin +ve.
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| *WT-1 +ve.
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| =Malignant= | | =Malignant= |