title: Paediatric Primary Pachymeningeal Xanthogranuloma with Scattered Foci Displaying Reticulohistiocytoma-like Features.
abstract: We report a unique case of a 4-year-old girl with an intriguing fibrohistiocytic tumour. Magnetic resonance imaging scans showed a dural mass of variegated intensity compressing the left occipital pole and apparently extending toward the superior sagittal sinus. Grossly, the cut surface of the surgical specimen was yellow, pale, and soft with reddish kernel-like crusts. Histologically, the yellow areas resembled cholesterol granulomas with widespread coagulative necrosis, cholesterol clefts, powdery calcification, foreign body-type giant cells, and foamy macrophages, while the scattered red spots contained numerous multinucleated giant cells of foreign-body and Touton types, the former with amphophilic to slightly eosinophilic cytoplasm. Immunoperoxidase reactions confirmed the expression of histiocytic markers and vimentin. As far as we know, no tumour displaying these peculiar morphological features has yet been described.
authors.affiliation: Anatomical Pathology Division, "Dr. Manuel Gea González" General Hospital, Mexico City, Mexico ; Pathology Unit, Neuropathology Service, Mexico General Hospital, Mexico City, Mexico.
authors.forename: Miguel Fdo
authors.initials: MF
authors.lastname: Salazar
authors.affiliation: Anatomical Pathology Division, "Dr. Manuel Gea González" General Hospital, Mexico City, Mexico.
authors.forename: María Del Rocío
authors.initials: Mdel R
authors.lastname: Estrada Hernández
authors.affiliation: Pathology Unit, Neuropathology Service, Mexico General Hospital, Mexico City, Mexico.
authors.forename: Erick
authors.initials: E
authors.lastname: Gómez Apo
authors.affiliation: Pathology Unit, Neuropathology Service, Mexico General Hospital, Mexico City, Mexico.
authors.forename: Laura G
authors.initials: LG
authors.lastname: Chávez Macías
authors.affiliation: Paediatric Neurosurgery, "Legaria" Paediatric Hospital, Mexico City, Mexico.
authors.forename: Carlos Alfonso
authors.initials: CA
authors.lastname: Rodríguez Álvarez
keywords: CNS fibrohistiocytic tumour; Cholesterol granuloma; Dural tumour; Fibroxanthoma; Solitary reticulohistiocytoma