Renal cell carcinoma false statement is –
**Core Concept**
Renal cell carcinoma (RCC) is a type of kidney cancer that originates in the lining of the proximal convoluted tubule, a part of the small tubes in the kidney that transport waste molecules from the blood to the urine. The most common type of RCC is clear cell renal cell carcinoma, accounting for approximately 70-80% of cases.
**Why the Correct Answer is Right**
The correct answer is related to the histological characteristics of RCC. RCC is known to be a hypervascular tumor, meaning it has an increased blood supply compared to normal renal tissue. This is due to the presence of vascular endothelial growth factor (VEGF) and other angiogenic factors that promote the formation of new blood vessels. The tumor's high vascularity is a key factor in its aggressive behavior and resistance to treatment.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because RCC is indeed a type of cancer that arises from the renal epithelium, specifically from the proximal convoluted tubule. The renal epithelium is the layer of cells that lines the renal tubules and glomeruli.
**Option B:** This option is incorrect because RCC is not typically associated with an increased level of intracellular calcium. Instead, RCC cells often exhibit increased levels of VEGF and other angiogenic factors, which promote tumor growth and metastasis.
**Option C:** This option is incorrect because RCC is not typically associated with a decrease in renal function. In fact, RCC often presents with hematuria, flank pain, and a palpable abdominal mass, which can lead to impaired renal function due to tumor compression or invasion of surrounding structures.
**Clinical Pearl / High-Yield Fact**
A classic clinical presentation of RCC is the triad of hematuria, flank pain, and a palpable abdominal mass. This triad is often referred to as the "classic triad" of RCC and should prompt further investigation, including imaging studies and biopsy, to confirm the diagnosis.
**Correct Answer: D.**