# Case report of a patient with an intraosseous meningioma presenting as possible metastasis from prostate cancer: Diagnostic dilemma and review of literature

## TL;DR

A patient with prostate cancer was initially thought to have a skull metastasis, but it was later found to be a rare intraosseous meningioma, highlighting the need for tissue diagnosis in such cases.

## Contribution

This case report adds to the literature by illustrating the diagnostic challenge of intraosseous meningiomas mimicking metastatic disease.

## Key findings

- The lesion in the skull was initially suspected to be a metastasis from prostate cancer.
- Pathology confirmed the lesion to be an intraosseous meningioma, not a metastasis.
- The patient was restaged and offered curative treatment for localized prostate cancer.

## Abstract

Intraosseous meningiomas are a rare subtype of meningiomas representing approximately 2% of all cases. They can confound a diagnosis of other bone lesions including metastatic tumors. We present a case of a patient with prostate cancer who on staging workup was suspected to have a skull metastasis. Both bone scan and CT Head demonstrated a lesion in the right frontal calvarium. Surgical resection and pathology revealed an intraosseous meningioma. The patient was restaged as having localized prostate cancer and the was offered curative treatment for his malignancy. The case highlights the importance of obtaining tissue diagnosis in cases of radiographic isolated oligometastatic disease in patients with a known primary malignancy.