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Mesothelial Cysts.

Georgia Karpathiou1, Francois Casteillo1, Maroa Dridi1

  • 1Pathology Department, University Hospital of Saint-Etienne, Saint-Etienne, France.

American Journal of Clinical Pathology
|December 1, 2020
PubMed
Summary
This summary is machine-generated.

Mesothelial cysts are typically found in the peritoneum, rarely in the pericardium. These cystic lesions exhibit distinct characteristics based on location and whether they are solitary or multiple.

Keywords:
Cystic mesotheliomaInclusion cystMulticystic mesotheliomaMultiloculated cystPericardial cystPeritoneal cystPleural cystPleuropericardial cyst

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Area of Science:

  • Pathology
  • Surgical Pathology
  • Gastrointestinal Pathology

Background:

  • Mesothelial cysts, often termed benign cystic mesothelioma, are infrequently documented, with most reports focusing on peritoneal cases.
  • Extraperitoneal occurrences of these cystic lesions are exceptionally rare.

Purpose of the Study:

  • To comprehensively characterize the clinicopathologic features of mesothelial cystic lesions within serosal cavities.
  • To differentiate between peritoneal and pericardial cystic lesions and analyze variations between solitary and multiple peritoneal lesions.

Main Methods:

  • Retrospective analysis of clinicopathologic findings from 79 mesothelial cystic lesions.
  • Detailed examination of histomorphologic features, clinical presentation, and patient demographics.

Main Results:

  • The majority of lesions (86%) were peritoneal, while 14% were pericardial; no pleural cases were identified.
  • Peritoneal lesions displayed plump eosinophilic mesothelium and loose stroma, contrasting with pericardial lesions' cuboidal/flattened mesothelium, collagenous stroma, and inflammation.
  • Solitary peritoneal lesions were more common in older patients and extrapelvic, whereas multiple lesions occurred in younger patients, often within the pelvis.

Conclusions:

  • Mesothelial cysts predominantly affect the peritoneum, with pericardial cysts being uncommon.
  • Distinct histopathologic differences exist between peritoneal and pericardial mesothelial cysts.
  • Variations between solitary and multiple peritoneal lesions suggest differing pathogenetic origins.