Mesothelial cysts
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Types
unifocal
multifocal
Localization
Localization
diaphragmatic mesothelial cysts
peritoneal surface (surface of the peritoneum)
- peritoneal cul-de-sac
- intestines
- urinary bladder
- uterine adnexa
- round ligament within the pelvis
- inguinal canal
- free-floating cysts in the peritoneal cavity
visceral
Synopsis
Gross appearance: polycystic lesions
Size: microscopic size to 2 cm in diameter
thin-walled, semitranslucent, filled with clear or yellowish fluid or gelatinous contents
cysts were with a single layer of flattened or cuboid mesothelial cells (CK+, calretinin+)
diffuse squamous cell metaplasia
cells focally forming small papillae
vacuolated cells
no mucus
Immunohistochemistry
CK +
calretin +
Associations
diaphragmatic defect (diaphragmatic hernia)
References
Arber DA, Strickler JG, Weiss LM. Splenic mesothelial cysts mimicking lymphagiomas. Am J Surg Pathol. 1997 Mar;21(3):334-8. PMID: 9060604