Benign metastasising meningiomas are a rare occurrence, encountered as a complication of a tiny fraction of all meningiomas diagnosed. It refers to spread of the tumour via metastases to distant sites, analogous to benign metastasising leiomyoma from uterine fibroids.
The incidence of benign metastasising meningiomas is less than 0.1% of meningiomas 2.
Presentation is very nonspecific with metastases reported widely throughout the body 1:
- pulmonary (60%)
- abdomen (34%) (mostly liver)
- cervical lymph nodes (18%)
- long bones, pelvis , skull (11%)
- pleura (9%)
- vertebra (7%)
- central nervous system (7%)
- mediastinum (5%)