Primary retroperitoneal tumors refer to tumors originating in adipose, loose connective tissue, fascia, muscle, blood vessels, neural tissue, lymphatic tissue, and the residual embryonic tissue in the retroperitoneal space. Two thirds of these tumors are malignant, which are typically soft tissue sarcoma, gastrointestinal stromal tumor (GIST), lymphoma, germ cell tumor, or other malignant tumors with lymph node metastasis, while benign tumors are typically lipoma, peripheral nerve sheath tumors, teratoma, and paraganglioma.
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