Epithelioid inflammatory myofibroblastic sarcoma: a case report.

Inflammatory myofibroblastic tumor (IMT) of the lung is a rare malignancy with few cases reported in the literature. Histologically, it is composed by spindle cells and an infiltrate of inflammatory cells. Children and young, non-smoking adults constitute the majority of cases, the clinical behavior ranges from a benign entity to a malignant process with rapid recurrence and metastatic progression.

A de novo unclassified malignant spindle cell neoplasm of liver allograft.

Spindle cell neoplasms are rarely reported in liver allografts; most are benign and associated with Epstein-Barr virus infection. We present a case of a malignant spindle cell neoplasm arising in a liver allograft. The patient underwent orthotopic liver transplant for cirrhosis secondary to nonalcoholic steatohepatitis.

Evidence for clonal fibroblast proliferation and autoimmune process in idiopathic retroperitoneal fibrosis.

Idiopathic retroperitoneal fibrosis is an uncommon disease characterized by encasement of retroperitoneal structures by fibrosis and chronic inflammation. Multiple etiologies have been proposed. First, we investigated if idiopathic retroperitoneal fibrosis is a clonal fibroblast proliferation by performing X-chromosome inactivation analyses.

Differentiated rhabdomyomatous tumors after chemotherapy for metastatic testicular germ-cell tumors: a clinicopathological study of seven cases mandating separation from rhabdomyosarcoma.

To gain insight concerning prognosis, we investigated seven cases of post-chemotherapy retroperitoneal lymph-node dissections from patients with testicular germ-cell tumors that contained sizable nodules of differentiated skeletal muscle, but that lacked both a primitive cellular component and mitotic activity. The patients were 18-28 years old at the time of retroperitoneal lymph-node dissection. All had a previous non-seminomatous germ-cell tumor of the testis, five of which had a teratoma component.