A 61-year-old man underwent right radical nephrectomy for a 6.8 cm renal mass. Histopathology confirmed clear cell renal cell carcinoma (ccRCC), Fuhrman grade 2, staged pT1b. On gross examination of the bisected specimen, the structure marked **B** shows a heterogeneous cut surface with golden-yellow areas. Which of the following best explains the pathological basis for this characteristic gross appearance in clear cell RCC?

Question

Accepted Answer

B. Abundant intracytoplasmic lipid and glycogen within neoplastic cells, which dissolve during routine histological processing leaving clear cytoplasm. ## Why option 1 is correct

The golden-yellow appearance on the cut surface of clear cell RCC is pathognomonic and directly reflects the abundant intracytoplasmic lipid and glycogen content of the neoplastic cells. During routine histological processing (particularly with organic solvents), these lipids dissolve, leaving behind the characteristic "clear" cytoplasm that defines this tumour type. The gross golden-yellow coloration is the macroscopic manifestation of this lipid-rich cytoplasm before processing. This feature is highly suggestive of ccRCC on gross examination and correlates with the histological hallmark of clear cells. (Campbell-Walsh-Wein Urology, 12th Edition, Chapter on Malignant Renal Tumours)

## Why each distractor is wrong

- **Option 2**: While ccRCC may show areas of haemorrhage and necrosis (as noted in structure C in this case), these typically appear as red-brown or tan-white zones rather than the characteristic golden-yellow colour. Calcification and fibrosis are not the primary drivers of the golden appearance.
- **Option 3**: Haemosiderin deposition produces a brown or rust-coloured appearance, not the distinctive golden-yellow hue. Iron metabolism changes occur secondary to haemorrhage but do not explain the primary gross coloration of the viable tumour.
- **Option 4**: Increased vascularity and arteriovenous shunting produce a hyperaemic, reddish appearance on cut surface. While ccRCC is indeed highly vascular, this does not account for the golden-yellow discoloration that is characteristic of the lipid-rich tumour cells.

**High-Yield:** Golden-yellow cut surface on gross examination of a renal mass = lipid-rich cytoplasm = clear cell RCC until proven otherwise.

[cite: Campbell-Walsh-Wein Urology, 12th Edition, Chapter on Malignant Renal Tumours]

Answer

A. Haemosiderin deposition from previous intratumoral haemorrhage and iron metabolism

Answer

C. Extensive areas of tumour necrosis with secondary calcification and fibrosis

Answer

D. Increased vascularity with prominent feeding arteries and arteriovenous shunting within the mass

Explanation

Why option 1 is correct

Why each distractor is wrong

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