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| :Should '''not''' be confused with ''[[malignant mesothelioma]]'' or ''[[benign multicystic mesothelioma]]''. | | :Should '''not''' be confused with ''[[malignant mesothelioma]]'' or ''[[benign multicystic mesothelioma]]''. |
| *[[AKA]] ''benign papillary mesothelioma''. | | *[[AKA]] ''benign papillary mesothelioma''. |
| ===General===
| | {{Main|Well-differentiated papillary mesothelioma}} |
| *Benign.
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| **Some say it is ''borderline''.<ref name=pmid2122588>{{Cite journal | last1 = Bürrig | first1 = KF. | last2 = Pfitzer | first2 = P. | last3 = Hort | first3 = W. | title = Well-differentiated papillary mesothelioma of the peritoneum: a borderline mesothelioma. Report of two cases and review of literature. | journal = Virchows Arch A Pathol Anat Histopathol | volume = 417 | issue = 5 | pages = 443-7 | month = | year = 1990 | doi = | PMID = 2122588 }}</ref>
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| *Classically women of reproductive age.<ref name=pmid18716115>{{Cite journal | last1 = Park | first1 = JY. | last2 = Kim | first2 = KW. | last3 = Kwon | first3 = HJ. | last4 = Park | first4 = MS. | last5 = Kwon | first5 = GY. | last6 = Jun | first6 = SY. | last7 = Yu | first7 = ES. | title = Peritoneal mesotheliomas: clinicopathologic features, CT findings, and differential diagnosis. | journal = AJR Am J Roentgenol | volume = 191 | issue = 3 | pages = 814-25 | month = Sep | year = 2008 | doi = 10.2214/AJR.07.3628 | PMID = 18716115 | URL = content/191/3/814.full.pdf}}</ref>
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| *Reported in tunica vaginalis of the [[testis]].<ref name=pmid1452778>{{Cite journal | last1 = Chetty | first1 = R. | title = Well differentiated (benign) papillary mesothelioma of the tunica vaginalis. | journal = J Clin Pathol | volume = 45 | issue = 11 | pages = 1029-30 | month = Nov | year = 1992 | doi = | PMID = 1452778 }}</ref>
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| ===Gross===
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| Features - typical:
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| *Multiple peritoneal nodules.
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| *Ascites.
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| DDx:<ref name=pmid18716115/>
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| *[[Tuberculosis]].
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| *Carcinomatosis.
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| *[[Primary peritoneal serous carcinoma]].
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| ===Microscopic===
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| Features:
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| *Papillary structures with:
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| **Thick fibrous cores.
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| **Simple cuboidal epithelium.
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| ***Small nucleoli.
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| Note:
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| *Lack cytologic atypia.
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| DDx:<ref>{{Cite journal | last1 = Truong | first1 = LD. | last2 = Maccato | first2 = ML. | last3 = Awalt | first3 = H. | last4 = Cagle | first4 = PT. | last5 = Schwartz | first5 = MR. | last6 = Kaplan | first6 = AL. | title = Serous surface carcinoma of the peritoneum: a clinicopathologic study of 22 cases. | journal = Hum Pathol | volume = 21 | issue = 1 | pages = 99-110 | month = Jan | year = 1990 | doi = | PMID = 1688545 }}</ref>
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| *[[Ovarian serous carcinoma]].
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| *[[Serous borderline tumour of the ovary]].
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| *[[Malignant mesothelioma]].
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| Image:
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| *[http://www.webpathology.com/image.asp?n=10&Case=86 Benign papillary mesothelioma (webpathology.com)].
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| ==Benign multicystic mesothelioma== | | ==Benign multicystic mesothelioma== |