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The mediastinum can be the site of origin of a variety of benign and malignant tumors of peripheral nerve sheath origin. Although schwannoma is one of the most common tumors found in the posterior mediastinum, peripheral nerve sheath tumors are reported in all compartments of the mediastinum. The majority of peripheral nerve sheath tumors in the mediastinum as in other anatomic sites occur sporadically, and a subset of them, most notably neurofibromas, and to a lesser extent, schwannomas and malignant peripheral nerve sheath tumors, occur in patients with syndromes such as neurofibromatosis 1 (NF1). In this review, the characteristics of mediastinal nerve sheath tumors along with the histologic differential diagnosis are summarized. Primary emphasis is placed upon the use of morphologic criteria for establishing a definitive diagnosis with reference to photomicrographs to illustrate the classic and sometimes unusual features of this varied group of tumors. The judicious application of ancillary testing, most frequently immunohistochemistry, for separating peripheral nerve sheath tumors from each other and from their morphologic mimics is reviewed. Included in the review are the clinicopathologic features, clinical management and prognostic implications of benign and malignant mediastinal peripheral nerve sheath

Mediastinal tumors of peripheral nerve origin (so-called neurogenic tumors)