Inflammatory myofibroblastic tumor with valvular involvement: a case report and review of the literature.

Background: Inflammatory myofibroblastic tumor (IMT) of the heart is extremely rare with unpredictable clinical expression. IMTs, characterized by spindle cells, plasma cells, and a polymorphic inflammatory infiltrate, have a predilection for children and young adults. Clinically, IMT mimics malignancy, making a definitive diagnosis difficult, prior to histopathological examination.