A 40-year-old man presented with painless haematuria. Bimanual examination revealed a ballottable mass over the right flank. Subsequently right nephrectomy was done and the mass was seen to be composed of cells with clear cytoplasm. Areas of hemorrhage and necrosis were frequent cytogenetic analysis of this mass is likely to reveal the abnormality of-

**Core Concept:**

The question is discussing a clinical scenario involving a patient presenting with painless haematuria (blood in the urine) and a palpable mass on examination. The patient undergoes a right nephrectomy (removal of the right kidney) and the mass is found to be composed of cells with clear cytoplasm. Cytogenetic analysis is a laboratory test that examines the chromosomes of a cell to identify any abnormalities or changes in the genetic material.

**Why the Correct Answer is Right:**

The correct answer (D) is "t(11;14)(q13;q32)." This translocation is a specific genetic abnormality associated with clear cell renal cell carcinoma (RCC). Clear cell RCC is a type of kidney cancer characterized by cells with clear cytoplasm, as seen in the patient's mass. Cytogenetic analysis can identify this specific translocation, confirming the diagnosis of clear cell RCC.

**Why Each Wrong Option is Invalid:**

A) Renal cell carcinoma (RCC) is a broad term that includes various subtypes. While some RCC subtypes may have clear cell features, the question specifies the clear cell RCC abnormality (t(11;14)(q13;q32) that should be identified.

B) Renal angiomyolipoma is a benign tumor (non-cancerous) composed of fat, smooth muscle, and blood vessels. The presence of hemorrhage and necrosis in the patient's mass indicates a malignant tumor, not an angiomyolipoma.

C) Papillary renal cell carcinoma (PRCC) is another type of kidney cancer, but it does not have a specific genetic abnormality like t(11;14)(q13;q32) that can be identified by cytogenetic analysis.

D) Chromosome 11 is involved in the correct answer, t(11;14)(q13;q32), but the other involved chromosome (14) is not mentioned in any of the wrong options, making it more likely that the correct answer is not related to this option.

**Clinical Pearl:**

Understanding the specific genetic abnormalities associated with various types of tumors can significantly aid in diagnosis and treatment planning. In the case of clear cell RCC, identifying the t(11;14)(q13;q32) translocation can help differentiate it from other kidney cancer types and guide appropriate management strategies.

✓ Correct Answer: B. Chromosome 3