Leptomeningeal cyst

Case contributed by Sepehr Haghighi


Previous history of motor vehicle trauma

Patient Data

Age: 1 year
Gender: Female

Oval shape lucency with smooth margins at parietal bone is detected in scanogram. 

A lytic calvarial lesion with scalloped edges at right parietal bone is visible with extracranial brain herniation. A large porencephalic cyst at right frontoparietal lobe is detected.  Right sided unilateral ventricular dilatation is seen.

Based on previous history of trauma and above mentioned findings, leptomeningeal cyst or growing fracture should be considered.

Case Discussion

CT scan is the modality of choice for the evaluation of leptomeningeal cyst. It consists of a lytic calvarial lesion with scalloped edges, in which encephalomalacia invaginates. The following features may also be present 1,2

  • extracranial brain herniation
  • hydrocephalus
  • unilateral ventricular dilatation
  • porencephalic cyst

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

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

 Thank you for updating your details.