Meningioma with pseudoglandular pattern. A case report.
A falx meningioma in an 11-year-old girl had a hemangiopericytomatous and papillary pattern, but the dominant histologic feature was a pseudoglandular arrangement of the tumor cells, closely imitating an adenocarcinoma. The gland-like spaces resulted mainly from dissolution of the centers of cell nests, and to a lesser extent from the fusion of papillary processes. The tumor-recurred locally five years after surgery and maintained its pseudoglandular pattern. Recognition of the existence of a pseudoglandular variant of meningiomas can prevent the mistaken diagnosis of a metastatic adenocarcinoma and other similar tumors.
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