Inguinal lymph nodal metastasis of myxopapillary ependymoma confirmed by fine-needle aspiration cytology, biopsy, and immunohistochemistry: case report - Vega-Orozco, R; Rembao-Bojórquez, D; Salmerón-Mercado, M; García-Marquez, A; Tena-Suck, M L (Diagn Cytopathol, 2011)