Localized primary malignant pericardial mesothelioma.

Primary malignant pericardial mesothelioma (PMPM) is an extremely rare tumor, which may appear as a localized or a diffuse mass encasing the heart. Diffuse PMPMs have a poor prognosis due to the difficulty of surgical excision, whereas localized PMPMs have clear margins, thus facilitating surgical excision. Timely diagnosis and proper treatment are crucial for a favorable prognosis. Eight cases of localized PMPMs have been reported so far, but their characteristics have not been fully described. Herein, we present a patient with localized PMPM and describe the diagnosis methods, treatment, and outcomes of these tumors.