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Differentiation of Pathologic Subtypes of Papillary Renal Cell Carcinoma on CT

¹ Department of Diagnostic Radiology, Tohoku University Hospital, Tohoku University Graduate School of Medicine, 1-1 Seiryomachi, Aoba-ku, Sendai, Miyagi 980-8574, Japan.
² Department of Pathology, Tohoku University Hospital, Miyagi, Japan.
³ Present address: Department of Pathology, Sendai Kosei Hospital, Miyagi, Japan.
⁴ Department of Radiology, Osaki Municipal Hospital, Miyagi, Japan.

OBJECTIVE. We reviewed the CT findings of the subtypes of papillary renal cell carcinoma (RCC), which behave differently clinicopathologically.

CONCLUSION. The CT features of the two pathologic subtypes of papillary RCC differ, probably reflecting their different pathologic features. Type 1 tumors have more distinct margins than type 2 tumors and have homogeneous density. Although type 2 tumors in the early stages show findings similar to those of type 1 tumors, they are at more advanced stages on the whole, with CT features showing indistinct margins, frequent centripetal infiltration, and tumor thrombi in all pT3b cases. Radiologists should be familiar with the CT features of papillary RCC that suggest different pathologic behaviors, such as tumor stage, tumor proliferation, and microvascular or vascular invasion.

Keywords: CT • kidney disease • oncologic imaging • papillary renal cell carcinoma • renal cell carcinoma

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				R. Vikram, C. S. Ng, P. Tamboli, N. M. Tannir, E. Jonasch, S. F. Matin, C. G. Wood, and C. M. Sandler Papillary Renal Cell Carcinoma: Radiologic-Pathologic Correlation and Spectrum of Disease1 RadioGraphics, May 1, 2009; 29(3): 741 - 754. [Abstract] [Full Text] [PDF]