Posterior parahepatic cyst

Posterior parahepatic cysts are an incidental finding of a small, isolated, nodular structure adjacent to the posterior segment of the right hepatic lobe. 

Due to the benign imaging characteristics and stability on long-term imaging, no pathologic diagnosis of these lesions has been obtained. 

In most cases, there is a single cyst, occasionally several can occur. The cysts can range in size from 0.3 cm to 2.5 cm, long axis. Attenuation varies from 12-80 HU. Posterior parahepatic cysts do not enhance, are not FDG-avid, and appear cystic on MRI. They do not grow on follow-up imaging. 

Most lesions occur at or above the level of the upper pole of the right kidney, consistently near the posterior segment of the right hepatic lobe, proximal to the right hemidiaphragm. Occasionally the lesions appear connected to the liver itself.

Considerations include

Radiologists should be familiar with this entity and avoid unnecessary alarm and workup when posterior parahepatic cysts are encountered in routine practice. In the setting of a history of malignancy, a follow-up examination may be appropriate to ensure stability.

Share article

Article information

rID: 58435
Synonyms or Alternate Spellings:
  • Posterior parahepatic cysts
  • Posterior parahepatic nodules

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1
    Drag here to reorder.
  • Case 2
    Drag here to reorder.
  • Case 3
    Drag here to reorder.
  • Case 4: FDG-PET
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.