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  • Title: Inflammatory myofibroblastic tumor of the uterus with prominent myxoid change.
    Author: Shintaku M, Fukushima A.
    Journal: Pathol Int; 2006 Oct; 56(10):625-8. PubMed ID: 16984620.
    Abstract:
    A surgical case of inflammatory myofibroblastic tumor arising in the uterine corpus and exhibiting prominent myxoid change of the stroma is reported. The patient was a 63-year-old woman with a large tumor mass that filled the uterine cavity and measured 11 cm in maximal dimension. The tumor had a gelatinous appearance and consisted of a loose proliferation of stellate or polygonal cells on a myxomatous background. Fascicular proliferation of spindle cells was also observed focally, and a chronic inflammatory cell infiltration was seen in many areas. Tumor cells had mild atypism and were immunoreactive for vimentin, alpha-smooth muscle actin, and anaplastic lymphoma kinase (ALK). Focal immunoreactivity for high-molecular-weight caldesmon (h-caldesmon) was also noted. The patient has been free from recurrence for 8 months. Inflammatory myofibroblastic tumor of the uterus occasionally shows prominent myxoid change of the stroma, and differentiation from myxoid leiomyosarcoma is problematic in these cases. Based on the immunoreactivity of tumor cells for ALK and h-caldesmon, the present tumor was considered inflammatory myofibroblastic tumor showing a focal phenotypic transition from myofibroblasts to smooth muscle cells.
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