Perivascular epitheloid cell tumour (PEComa) of the retroperitoneum – a rare tumor with uncertain malignant behaviour: a case report by Koenig Alexandra M, Quaas Alexander, Ries Thorsten, Yekebas Emre F, Gawad Karim A, Vashist Yogesh K, Burdelski Christoph, Mann Oliver, Izbicki Jakob R, Erbersdobler Andreas

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