Polycystic and ring-shaped intracranial meningiomas

Area of Science:

• Neurology
• Neurosurgery
• Oncology

Background:

• Intracranial meningiomas are common primary tumors of the central nervous system.
• Peritumoral cysts are occasionally associated with meningiomas, but cystic or polycystic intratumoral components are rare.
• The radiological and pathological features of cystic meningiomas require further elucidation.

Observation:

• Two middle-aged women presented with intracranial tumors exhibiting unusual cystic patterns on computed tomography (CT) scans.
• The tumors appeared as ring-shaped or polycystic masses, prompting further investigation.
• These imaging findings were initially atypical for common meningioma presentations.

Findings:

• Histopathological examination confirmed both tumors to be intracranial meningiomas.
• In one patient, cysts were intratumoral with walls composed solely of meningioma tissue.
• In the second patient, cysts were peritumoral, with connective walls containing scattered meningioma cells.

Implications:

• This case series highlights that meningiomas can exhibit significant cystic components, both intratumoral and peritumoral.
• Recognition of these cystic patterns on imaging is crucial for accurate diagnosis and surgical planning.
• Further research into the pathogenesis and optimal management of cystic meningiomas is warranted.