Benign Neurofibroma/Schwannoma Hybrid Peripheral Nerve Sheath Tumor of the Ulnar Nerve Harboring a Metastatic Papillary Thyroid Carcinoma Deposit: A Case Report of Tumor-to-Tumor Metastasis

Figure 1

Pre- and postsurgical imaging. (a) A/P shoulder X-ray that was unremarkable. (b) Coronal short tau inversion recovery (STIR) MRI imaging showing an enhancing mass with heterogeneity (red arrow). (c) Precontrast nonfat sat T1-weighted MRI imaging showing the mass to be uniformly hypointense. (d) T1 axial fat-suppression postcontrast MRI showing heterogenous enhancing mass. (e) Image taken during US-guided biopsy showing an enlarged mass (red arrow) arising from nerve (red stars) most consistent for a PNST. (f) Postsurgical PET/CT scan showing some residual FDG signal in the postsurgical bed of the right arm (red arrow) and progression of metastatic PTC (mediastinal adenopathy, right upper paravertebral/subpleural nodule, para-aortic nodule, right medial upper lung nodule, and left upper lobe solid mass).

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