Question
Patient with history of right-sided flank pain. Coronal CT image is shown. What is the diagnosis?
| A. | Gallbladder mass |
| B. |
Liver abscess |
| C. |
Renal Cell Carcinoma (RCC) |
| D. |
Retroperitoneal tumor |
|
Correct Answer � C Explanation |
 |
– RCC: Most common primary renal malignancy in adults.
– Originates from renal tubular epithelium.
Classic triad (in <10%):
– Flank pain
– Hematuria
– Palpable abdominal mass
May present with:
– Paraneoplastic syndromes (e.g., polycythemia, hypercalcemia)
– Constitutional symptoms (fever, weight loss)
Imaging hallmark:
– Solid, heterogeneously enhancing mass from kidney
– May involve renal vein, inferior vena cava (IVC), or metastasize
Incorrect Options:
A. Gallbladder mass
– Located in RUQ, not renal fossa.
– Does not present with flank pain.
B. Liver abscess
– Appears as hypodense, rim-enhancing lesion.
– Symptoms: fever, RUQ pain, malaise.
– Not a solid renal mass.
D. Retroperitoneal tumor
– Usually displaces the kidney.
– Mass arises from kidney itself, not adjacent.