PT - JOURNAL ARTICLE AU - Mathieu Charest AU - Josephine Pressacco AU - Jaramie Thomas-Gittens TI - Malignant peripheral nerve sheath tumours of the pericardium in a patient with Neurofibromatosis type 1: The diagnostic value of 18F-FDG PET-CT and I-123 MIBG SPECT-CT AID - 10.2967/jnmt.117.199927 DP - 2017 Nov 01 TA - Journal of Nuclear Medicine Technology PG - jnmt.117.199927 4099 - http://tech.snmjournals.org/content/early/2017/11/08/jnmt.117.199927.short 4100 - http://tech.snmjournals.org/content/early/2017/11/08/jnmt.117.199927.full AB - A 25 year old female with known neurofibromatosis type 1 with a large anterior mediastinal mass was investigated. F18-FDG PET-CT revealed a radiotracer avid anterior mediastinal mass with SUVmax of 4.3 and demonstrating a hypoactive center. The Iodine-123 MIBG SPECT-CT study performed subsequently did not demonstrate any uptake, thereby excluding for the most part the diagnoses of paraganglioma or neuroblastoma. At final pathology, a malignant peripheral nerve sheath tumour (MPNST) of the pericardium with areas of chondrosarcomatous and angiosarcomatous differentiation was diagnosed.