Which histopathological feature best distinguishes clear cell renal cell carcinoma (ccRCC) from papillary renal cell carcinoma (pRCC)?

Question

Accepted Answer

C. Presence of abundant intracytoplasmic lipid and glycogen in tumor cells. ## Histopathological Distinction Between ccRCC and pRCC

### Clear Cell RCC (ccRCC)

**Key Point:** The hallmark feature of ccRCC is the presence of abundant **intracytoplasmic lipid and glycogen**, which imparts a clear, vacuolated appearance to the cytoplasm on H&E staining.

- Cells appear pale or "clear" due to lipid extraction during routine processing
- PAS-positive, diastase-resistant glycogen is abundant
- Accounts for ~70–80% of all RCC cases
- Most aggressive subtype with worst prognosis

### Papillary RCC (pRCC)

**Key Point:** pRCC is characterized by a **papillary or tubulopapillary architecture** with cuboidal to columnar epithelial cells, NOT clear cytoplasm.

- Cells contain hemosiderin-laden foamy macrophages in the stroma (not in tumor cells)
- Low to intermediate nuclear grade typical
- Accounts for ~10–15% of RCC cases
- Better prognosis than ccRCC

### Comparative Table

| Feature | Clear Cell RCC | Papillary RCC |
|---------|---|---|
| **Cytoplasm** | Clear, lipid/glycogen-rich | Granular, eosinophilic |
| **Architecture** | Solid sheets, alveolar | Papillary, tubulopapillary |
| **Stromal macrophages** | May be present | Prominent, hemosiderin-laden |
| **Frequency** | 70–80% | 10–15% |
| **Grade** | Often high (Fuhrman III–IV) | Often low–intermediate |
| **Prognosis** | Worse | Better |

**High-Yield:** The **clear cell appearance** is the single most reliable discriminator on routine H&E microscopy and is the defining feature that distinguishes ccRCC from all other RCC subtypes, including pRCC.

**Clinical Pearl:** ccRCC is associated with VHL gene mutations and can present with paraneoplastic syndromes (erythropoietin, renin, PTHrP secretion), whereas pRCC is often multifocal and bilateral.

![Renal Cell Carcinoma diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/3155.webp)

Answer

A. Nested growth pattern with prominent vascularity

Answer

B. Papillary architecture with cuboidal cells and low nuclear grade

Answer

D. Foamy macrophages in the stroma with hemosiderin deposition

Which histopathological feature best distinguishes clear cell renal cell carcinoma (ccRCC) from papillary renal cell carcinoma (pRCC)?

Explanation

Histopathological Distinction Between ccRCC and pRCC

Clear Cell RCC (ccRCC)

Papillary RCC (pRCC)

Comparative Table

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Feature	Clear Cell RCC	Papillary RCC
Cytoplasm	Clear, lipid/glycogen-rich	Granular, eosinophilic
Architecture	Solid sheets, alveolar	Papillary, tubulopapillary
Stromal macrophages	May be present	Prominent, hemosiderin-laden
Frequency	70–80%	10–15%
Grade	Often high (Fuhrman III–IV)	Often low–intermediate
Prognosis	Worse	Better