Case report 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

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SUMMARY

A tumor-to-tumor metastasis (TTM) is a rare metastatic process in which a primary malignant tumor ("donor") metastasizes to another tumor ("recipient"), most commonly a benign tumor. The most common TTM recipient tumors are meningioma and renal cell carcinoma with the most common TTM donor tumors being breast and lung cancer. To the knowledge, the authors describe the first case of malignant-to-benign tumor-to-tumor metastasis of welldifferentiated PTC into a benign (hybrid) PNST reported in the literature. More specifically, the authors believe this is the first case described in which . . .

 



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