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Clinicopathologic Features of Convexity en Plaque Meningioma

Takahiro Sasaki1, Toshikazu Yamoto1, Yasuo Nakai1

  • 1Department of Neurological Surgery, School of Medicine, Wakayama Medical University, Wakayama City, Wakayama, Japan.

World Neurosurgery
|July 8, 2026
PubMed
Abstract

Insights

Convexity en plaque meningiomas show higher recurrence rates and poorer outcomes than typical types, mainly due to lower resection rates. Close surveillance is recommended for these rare bone-invading tumors.

Area of Science:

  • Neurosurgery
  • Oncology
  • Pathology

Background:

  • En plaque meningioma is a rare subtype characterized by plate-like growth along the dura mater with bone invasion.
  • Convexity meningiomas, specifically the en plaque subtype, present unique clinical and pathological challenges.

Purpose of the Study:

  • To examine the clinicopathological features of convexity meningioma en plaque.
  • To compare treatment outcomes between en plaque and normal-type convexity meningiomas.

Main Methods:

  • Retrospective cohort study of 81 newly diagnosed convexity meningiomas (2009-2024).
  • Classification into 'normal type' or 'en plaque type' based on size and thickness ratios.
  • Comparison of clinicopathological features and treatment outcomes.

Main Results:

  • En plaque type meningiomas (17%) were associated with absent cerebrospinal space, lower total resection rates (29%), higher postoperative epilepsy (43%), and poorer performance status.
  • Meningothelial subtype was more frequent in en plaque type (64%).
  • Five-year progression-free survival was significantly lower for en plaque type (38%) compared to normal type (83%).

Conclusions:

  • Convexity en plaque meningioma exhibits a significantly higher recurrence rate, linked to reduced total resection.
  • Close patient surveillance is crucial for managing convexity en plaque meningioma due to poorer prognosis.
Keywords:
Brain invasionConvexityEn plaqueMeningioma

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