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

<div>Histopathology of hybrid neurofibroma/schwannoma component. Low-magnification images ((a) 40x and (b) 100x) identify the neurofibroma (A1/B1), schwannoma (B3), and metastatic carcinoma (A2/B2). Immunohistochemistry for SOX10 (c) is positive within the NF and schwannoma portions, but negative in the carcinoma portions (C2). CD34 (d) is negative within the schwannoma component (D3) and exhibits the so called “thumbprint” appearance in the NF component (D1).</div>

Case Reports in Pathology

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Figure 2: 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 2 | 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 