ArticleRadiology case reports2026
Purely extradural meningioma presenting as an incidental sacro-iliac joint mass.
Article in Radiology case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report the case of an asymptomatic 32-year-old woman in whom a 38-mm right sacroiliac mass was incidentally discovered on computed tomography. Computed tomography demonstrated a well-defined enhancing lesion centered on the right sacral ala and sacroiliac joint with sclerotic margins, without cortical destruction or presacral extension. Magnetic resonance imaging showed a relatively homogeneous mass, iso- to hypointense on T1-weighted images, hyperintense on short tau inversion recovery sequences, and demonstrating intense homogeneous enhancement after gadolinium administration. Computed tomography-guided biopsy revealed a spindle-cell proliferation with diffuse somatostatin receptor 2A (SSTR2A), epithelial membrane antigen, and progesterone receptor expression, and a low Ki-67 index (1%), consistent with a World Health Organization grade 1 meningioma. One-year imaging follow-up demonstrated strict stability, and conservative management was maintained.
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