Diaphragmatic mesothelial cyst

Diaphragmatic mesothelial cysts are rare benign congenital lesions involving the diaphragm. They are thought to derive from from celomic remnants. 


They typically present in the pediatric population.

Radiographic features


Typically right sided and seen as a cystic mass between the thoracic wall and the liver, in the right posterolateral costophrenic angle 3. Many tend to be thin-walled bilobulated or oval-shaped. Some lesions can show subtle evidence of their extrahepatic location.


May play a role in confirming its cystic nature in some cases 4.

Differential diagnosis

For a smaller more inferior cystic lesions



Article information

rID: 69031
System: Chest
Synonyms or Alternate Spellings:
  • Congenital intra-diaphragmatic cysts
  • Congenital intra-diaphragmatic cyst
  • Intra-diaphragmatic cysts
  • Intra-diaphragmatic cyst
  • Diaphragmatic mesothelial cysts

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Cases and figures

  • Case 1: probable
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  • Case 2
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