title: Pilomatrixoma: a pitfall in the aspiration cytology of skin tumors.
abstract: The aspirates from six tumors of pilomatrixoma were cytologically misinterpreted. The fine needle aspiration findings of these six tumors are described. The common cytologic features of pilomatrixoma are clusters of tightly arranged cells and numerous single naked nuclei. The nuclei of cells in clusters as well as the naked nuclei are vesicular, with evenly distributed chromatin and distinct nucleoli. In addition, "ghost" cells and multinucleated giant cells present in some smears can support the cytologic diagnosis of pilomatrixoma.
mesh_terms: D001707:Biopsy, Needle; D002466:Cell Nucleolus / Q000648:ultrastructure; D002467:Cell Nucleus / Q000648:ultrastructure; D002843:Chromatin / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure; D006801:Humans; D012878:Skin Neoplasms / Q000175:diagnosis / Q000473:pathology*
chemical_list: D002843:Chromatin