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Spinal atypical teratoid/rhabdoid tumor in a 7‐year‐old boy

Reported herein is an unusual case of atypical teratoid/rhabdoid tumor (AT/RT) of the lumbar spine with an intradural extramedullary location in a 7‐year‐old boy. Histologically, this tumor contained rhabdoid cells, pale cells, and sickle‐shaped embracing cells without primitive neuroectodermal tumor (PNET), mesenchymal or epithelial components. Immunohistochemical staining showed that these tumor cells react positively for epithelial membrane antigen (EMA), vimentin, cytokeratin (AE1/AE3), CD99 and neurofilament protein, but negatively for INI1 antibody. Chromosome 22q deletion was demonstrated on fluorescence in situ hybridization.