Primary Clear Cell Microcystic Adenoma of the Sinonasal Cavity: Pathological or Fortuitous Association?

Figure 2

Immunohistochemistry (IHC) of renal and sinonasal tumours, ×2. (a) Sinonasal tumour cells were negative for CD10. (b) Renal tumour cells were strongly positive for CD10. (c) Sinonasal tumour cells were negative for RCC; however, weak staining of luminal secretions was seen. (d) Renal tumour cells demonstrated strong positivity for RCC marker. (e) Sinonasal tumour cells demonstrated positivity for CK7. (f) The renal tumour was negative for CK7; however, in this image a proximal renal tubule was seen to exhibit CK7 positivity. (g) The sinonasal tumour exhibited patchy CK20 positivity. (h) The renal tumour was negative for CK20.

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