title: [Polypoid pseudosarcoma of the tongue].
abstract: Polypoid pseudosarcoma (PP) is a rare type of squamous-cell carcinoma of mouth, fauces and larynx with sarcoma-like reaction. Clinically PP is characterized by large pedunculated or sessile masses of rapid growing. This tumour recurs easily but rarely provokes metastasis. A case of polypoid pseudosarcoma of the tongue is reported. Differential diagnosis with spindle-cell carcinoma can be made following the criteria: a) the frequency and the sarcomatous appearance of the metastasis in the spindle-cell carcinoma, while PP rarely provokes metastasis which have a squamous-cell pattern; b) the gradual transition within the epithelial and the sarcomatous aspects in the spindle-cell carcinoma, not present in PP; and c) the presence of tonofilaments and desmosomes in the sarcomatous cells of the spindle-cell carcinoma, which lack in the sarcoma-like masses of PP.
mesh_terms: D000368:Aged; D002277:Carcinoma / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D005350:Fibroma / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D009364:Neoplasm Recurrence, Local / Q000473:pathology; D014062:Tongue Neoplasms / Q000473:pathology* / Q000648:ultrastructure
vernacular_title: Seudosarcoma polipoide de la lengua.