Pediatric rhabdoid meningioma: a morphological, immunohistochemical, ultrastructural and molecular case study
Article first published online: 8 APR 2010
© 2010 Japanese Society of Neuropathology
Volume 31, Issue 1, pages 59–65, February 2011
How to Cite
Buccoliero, A. M., Castiglione, F., Degl'Innocenti, D. R., Franchi, A., Sanzo, M., Cetica, V., Giunti, L., Sardi, I., Mussa, F., Giordano, F., Genitori, L. and Taddei, G. L. (2011), Pediatric rhabdoid meningioma: a morphological, immunohistochemical, ultrastructural and molecular case study. Neuropathology, 31: 59–65. doi: 10.1111/j.1440-1789.2010.01113.x
- Issue published online: 19 JAN 2011
- Article first published online: 8 APR 2010
- Received 6 August 2009; revised and accepted 18 February 2010; published online 8 April 2010.
- central nervous system;
Rhabdoid meningioma is an uncommon meningioma variant categorized as WHO grade III. The majority of cases occur in adulthood. Herein, we describe a right fronto-temporal rhabdoid meningioma affecting a 3-year-old boy. The lesion measured approximately 4 cm in diameter and incorporated the ipsilateral middle cerebral artery. Sub-total surgical excision of the mass was performed. Histologically, the tumor was mainly composed of globoid plump cells with inclusion-like eosinophilic cytoplasm, peripheral nuclei, prominent nucleoli and occasional intra-nuclear cytoplasmic pseudo-inclusion. The cells appeared in many areas loosely arranged and focally disclosed a papillary architecture. At immunohistochemistry, the tumor cells were EMA, vimentin, HHF35, PgR, INI-1 and p53 positive. The proliferative index (Mib-1) was 15% in the most positive areas. Ultrastructurally, tumoral cells showed an abundant cytoplasm, which was filled with numerous intermediate filaments. Desmosomal junctions were seen. RT-PCR revealed the presence of NF2 gene expression. Molecular study did not indicate alterations of the INI-1 gene, whereas it showed the presence of Pro72Arg in exon 4 at heterozygous state in the TP53 gene. Morphologic features along with immunohistochemical, ultrastructural and molecular results were consistent with the diagnosis of rhabdoid meningioma. The patient was treated with chemotherapy. The lesion remained stable after 33 months of follow-up. Rhabdoid meningiomas rarely occur in children. Owing to its rarity, each new case should be recorded to produce a better clinical, pathological, molecular, prognostic and therapeutic characterization of this lesion.