Sarcomatoid component can occur in all histological subtypes of renal cell carcinoma but most commonly accompanies chromophobe renal cell carcinoma. The majority of the sarcomatoid components consist of malignant fibrous histiocytoma, fibrosarcoma or undifferentiated sarcoma areas. Heterologous differentiation in the form of osteosarcoma or rhabdomyosarcoma is very rarely encountered. We report a very rare case of a chromophobe renal cell carcinoma with osteosarcomatous differentiation that presented as a retroperitoneal mass. Renal cell carcinoma with sarcomatoid change should be always kept in mind when a retroperitoneal mass with sarcomatoid differentiation is encountered.
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Fukushima, Takafumi
Teishima, Jun
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Teishima, Jun
Goto, Keisuke
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Goto, Keisuke
Takemoto, Kenshiro
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Takemoto, Kenshiro
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Sekino, Yohei
Kobatake, Kohei
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Kobatake, Kohei
Ikeda, Kenichiro
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Ikeda, Kenichiro
Hayashi, Tetsutaro
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Hiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Hayashi, Tetsutaro
Sentani, Kazuhiro
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Hiroshima Univ, Grad Sch Biomed Sr Hlth Sci, Dept Mol Pathol, Hiroshima, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan
Sentani, Kazuhiro
Oue, Naohide
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Hiroshima Univ, Grad Sch Biomed Sr Hlth Sci, Dept Mol Pathol, Hiroshima, JapanHiroshima Univ, Dept Urol, Grad Sch Biomed Sr Hlth Sci, Minami Ku, 1-2-3 Kasumi, Hiroshima 7348551, Japan