Question:
CT scan is least accurate for the diagnosis of which of the following?
CT scan is least accurate for the diagnosis of which of the following?
Show Hint
Which of these lesions is often non-calcified and isodense to its surrounding fluid?
Updated On: Jun 24, 2026
- 1 cm aneurysm in the hepatic artery
- 1 cm lymph node in the para-aortic region
- 1 cm mass in the tail of the pancreas
- 1 cm gall stone
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Frame the question.
The question asks where CT performs worst (least accurate), not where it performs well.
Step 2: Where CT is strong.
CT (especially contrast-enhanced) is excellent for vascular lesions such as a hepatic artery aneurysm, for nodal disease in the para-aortic region, and for solid masses in the pancreatic tail. All these show good contrast against surrounding tissue.
Step 3: Where CT is weak.
Many gallstones are composed of cholesterol and are radiolucent or isodense with bile, so they are poorly seen on CT. CT detects only a fraction of gallstones, and a 1 cm non-calcified stone can easily be missed.
Step 4: The reference standard for gallstones.
Ultrasonography is the investigation of choice for gallstones (a mobile, echogenic focus with posterior acoustic shadowing), with very high sensitivity. CT is therefore the least accurate of the listed options.
Hence the answer is a 1 cm gall stone.
The question asks where CT performs worst (least accurate), not where it performs well.
Step 2: Where CT is strong.
CT (especially contrast-enhanced) is excellent for vascular lesions such as a hepatic artery aneurysm, for nodal disease in the para-aortic region, and for solid masses in the pancreatic tail. All these show good contrast against surrounding tissue.
Step 3: Where CT is weak.
Many gallstones are composed of cholesterol and are radiolucent or isodense with bile, so they are poorly seen on CT. CT detects only a fraction of gallstones, and a 1 cm non-calcified stone can easily be missed.
Step 4: The reference standard for gallstones.
Ultrasonography is the investigation of choice for gallstones (a mobile, echogenic focus with posterior acoustic shadowing), with very high sensitivity. CT is therefore the least accurate of the listed options.
Hence the answer is a 1 cm gall stone.
Was this answer helpful?
0
0
Top NEET PG Radiology Questions
- The occipitomental view of an X-ray of the paranasal sinuses (PNS) is called?
- A cancer patient undergoes radiotherapy. Pick the true statement regarding radiosensitivity of tissues:
- Identify the condition in the X-ray given below.
- A chest radiograph obtained in a male with hypertension. What will be the diagnosis?
- Identify the radiological sign given below.
View More Questions
Top NEET PG Questions
- A patient hailing from Delhi presents with fever, arthralgia, and extensive petechial rash for 3 days. Lab investigations revealed a hemoglobin of 9 g/ dL, a white blood cell count of 9000 cells/mm3, a platelet count of 20000 cells/mm3, and a prolonged bleeding time. The clotting time was normal. What is the most likely diagnosis?
- Which of the following statements is true about Trichomonas vaginalis?
- A lady from West Rajasthan presented with an ulcer surrounded by erythema on the right leg. Microscopy of the biopsy from the edge of the ulcer showed organisms with dark staining nuclei and kinetoplast. What is the most likely causative agent?
- A child presents with a fever and a rash. Urine examination showed cells with owl's eye appearance. What is the most likely diagnosis?
- Infection with Clonorchis sinensis is associated with an increased risk of__?
View More Questions