RT Journal Article SR Electronic T1 Malignant Peripheral Nerve Sheath Tumors of the Pericardium in a Patient with Neurofibromatosis Type 1: The Diagnostic Value of 18F-FDG PET/CT and 123I-MIBG SPECT/CT JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 61 OP 62 DO 10.2967/jnmt.117.199927 VO 46 IS 1 A1 Mathieu Charest A1 Josephine Pressacco A1 Jaramie Thomas-Gittens YR 2018 UL http://tech.snmjournals.org/content/46/1/61.abstract AB A 25-y-old woman with known neurofibromatosis type 1 and a large anterior mediastinal mass was investigated. 18F-FDG PET/CT revealed a radiotracer-avid anterior mediastinal mass having an SUVmax of 4.3 and demonstrating a hypoactive center. The 123I-metaiodobenzylguanidine SPECT/CT study performed subsequently did not demonstrate any uptake, thereby excluding, for the most part, the diagnosis of paraganglioma or neuroblastoma. At final pathology, a malignant peripheral nerve sheath tumor of the pericardium with areas of chondrosarcomatous and angiosarcomatous differentiation was diagnosed.