[Unusual presentation of metastasis of prostate carcinoma as a mediastinal mass: A case report and a brief review of the literature.].

To assess the metastasic prostatecancer in the differenctial diagnosis of mediastinal masses. METHODS: To report a case. RESULTS: We present the case of a 78-year-old male patientwith a diagnosis of prostate cancer with a mediastinalmass compatible with prostate metastasis.

[IgG4-Related Retroperitoneal fibrosis].

Objective: To report two new cases of IgG4-related retroperitoneal fibrosis, a recently described pathology.

Methods: We analyze two cases diagnosed in our center and performed a literature review.

Result: IgG4 related disease is a recently described entity that includes previously not related pathologies.