AI Applications in Neuroradiology — MCQs
What is the investigation of choice for diagnosing subarachnoid hemorrhage (SAH)?
BIRADS stands for
What is the imaging modality of choice for determining the etiology of subarachnoid hemorrhage?
Based on the provided image, which of the following is the correct diagnosis?
What is the classification of intelligence corresponding to an IQ score of 90-109?
A man presents to the emergency department with a head injury following a vehicular accident. What is the investigation of choice?
A polytrauma patient's CT brain shows a crescent-shaped extra-axial collection with a concave inner margin. What is the most likely diagnosis?
Depth of Anesthesia is best measured by:
Best investigation to detect rupture of silicone breast implants is-
Parameningeal Rhabdomyosarcoma is best diagnosed by:
AI Applications in Neuroradiology Indian Medical PG Practice Questions and MCQs
Question 1: What is the investigation of choice for diagnosing subarachnoid hemorrhage (SAH)?
- A. Radionuclide scan
- B. X-ray skull
- C. MRI
- D. CT scan (Correct Answer)
Explanation: ***CT scan*** - A **non-contrast CT scan of the head** is the immediate investigation of choice for diagnosing SAH due to its high sensitivity for detecting fresh blood. - It can quickly identify the presence of **blood in the subarachnoid space**, especially within the first 6-12 hours after symptom onset. *Radionuclide scan* - This imaging technique uses **radioactive tracers** to evaluate organ function or blood flow. - It is **not used for acute diagnosis** of SAH, as it does not directly visualize blood in the CNS. *X-ray skull* - An **X-ray of the skull** primarily visualizes bone structures and can detect fractures or other bony abnormalities. - It is **ineffective at detecting blood** in the subarachnoid space and is not used for SAH diagnosis. *MRI* - While MRI can detect SAH, especially in subacute or chronic phases, it is **less sensitive than CT for acute SAH** due to longer acquisition times and motion artifacts. - It is often considered if CT is negative and clinical suspicion remains high, but **not as the initial investigation of choice** in an acute setting.
Question 2: BIRADS stands for
- A. Breast Imaging Reporting and Data System (Correct Answer)
- B. Best Imaging Reporting and Data System
- C. Blood Imaging Reporting and Data System
- D. Brain Imaging Reporting and Data System
Explanation: ***Breast Imaging Reporting and Data System*** - **BIRADS** is a standardized system for reporting mammography, ultrasound, and MRI findings related to the breast. - It provides a **common lexicon** for radiologists to describe findings and assign a final assessment category, guiding patient management. *Best Imaging Reporting and Data System* - This option is incorrect because the "B" in BIRADS specifically refers to "**Breast**," indicating its application to breast imaging. - The term "**Best**" is a subjective adjective and not part of the official acronym used in medical imaging. *Blood Imaging Reporting and Data System* - This option is incorrect as BIRADS is exclusively used for **breast imaging** and does not pertain to blood-related diagnostic imaging. - Systems for reporting blood-related findings would fall under different medical specialties or laboratory medicine. *Brain Imaging Reporting and Data System* - This option is incorrect because BIRADS is specific to **breast imaging**, and there are other specialized reporting systems for brain imaging, such as **neuroradiology reporting guidelines**. - The acronym is directly tied to the anatomical region being examined, which is the breast.
Question 3: What is the imaging modality of choice for determining the etiology of subarachnoid hemorrhage?
- A. Non-contrast CT
- B. CECT
- C. Four vessel DSA (Correct Answer)
- D. MRI
Explanation: ***Four vessel DSA*** - **Four-vessel Digital Subtraction Angiography (DSA)** is considered the gold standard for identifying the source of subarachnoid hemorrhage (SAH). - It provides high-resolution images of the **cerebral vasculature**, enabling the detection of small aneurysms, arteriovenous malformations, or other vascular lesions. *Non-contrast CT* - **Non-contrast CT** is the imaging modality of choice for the initial diagnosis of SAH itself. - However, it primarily identifies the presence of blood and its location, but is not as effective in determining the **underlying cause** of the hemorrhage in many cases. *CECT* - **Contrast-enhanced CT (CECT)** can help identify some vascular abnormalities by highlighting vessels, but its sensitivity for detecting small aneurysms or complex vascular lesions is lower than DSA. - It is often used as an alternative or supplementary study when DSA is not immediately available or contraindicated. *MRI* - **MRI** is highly sensitive for detecting intraparenchymal and subtle SAH in later stages but is less effective than CT for acute blood detection, especially within the first few hours. - While MRA (Magnetic Resonance Angiography) can identify vascular lesions, its resolution and ability to detect smaller aneurysms are generally inferior to DSA.
Question 4: Based on the provided image, which of the following is the correct diagnosis?
- A. Uterus didelphys
- B. Bicornuate Uterus
- C. Unicornuate Uterus (Correct Answer)
- D. Septate uterus
Explanation: ***Unicornuate Uterus*** - The image distinctly shows **only one fallopian tube and one rudimentary uterine horn** on the right side, indicating a unicornuate uterus. - This malformation results from the **incomplete development of one Müllerian duct**, leading to a single, banana-shaped uterine cavity. *Uterus didelphys* - This condition involves **two completely separate uteri**, each with its own cervix and vagina. - The image does not show evidence of two distinct uterine bodies or cervices. *Bicornuate Uterus* - A bicornuate uterus is characterized by **two uterine horns that fuse caudally**, creating a heart-shaped appearance with a shared cervix. - The image clearly lacks the characteristic heart shape and shows only one functional horn. *Septate uterus* - A septate uterus has a **fibrous or muscular septum** dividing the uterine cavity, while the external uterine contour remains normal. - The image does not show a septum or a normal external uterine contour with an internal division; instead, it presents with a single underdeveloped horn.
Question 5: What is the classification of intelligence corresponding to an IQ score of 90-109?
- A. Below average
- B. Average (Correct Answer)
- C. Slightly below average
- D. Above average
Explanation: ***Average*** - An **IQ score** range of **90-109** is traditionally classified as **Average** intelligence. - This range represents the **mean** and surrounding **standard deviation** of IQ scores in the general population. *Below average* - This classification usually corresponds to IQ scores in the range of **70-79** or **80-89**, depending on the specific scale. - It does not represent the central tendency of the population's intelligence. *Slightly below average* - This category typically corresponds to IQ scores in the range of **80-89**. - It falls just below the average range but is not as low as the "below average" classification. *Above average* - This classification is typically assigned to IQ scores that are in the range of **110-119** or higher. - It signifies cognitive abilities that are greater than the majority of the population.
Question 6: A man presents to the emergency department with a head injury following a vehicular accident. What is the investigation of choice?
- A. MRI
- B. CECT
- C. NCCT (Correct Answer)
- D. X-ray
Explanation: ***NCCT*** - **Non-contrast Computed Tomography (NCCT)** of the head is the **investigation of choice** for acute head trauma due to its rapid acquisition, wide availability, and excellent sensitivity for detecting acute hemorrhage, fractures, and mass effects. - It rapidly identifies life-threatening conditions such as **epidural, subdural, and intracerebral hemorrhages**, which require immediate intervention. *MRI* - **MRI** is superior for detecting subtle brain tissue injuries, diffuse axonal injury, and non-hemorrhagic lesions but is generally **not the first-line investigation** in acute trauma due to longer scan times, limited availability in the emergency setting, and inability to detect acute hemorrhage as clearly as CT. - Its use is typically reserved for follow-up studies or when CT findings are inconclusive or specific soft tissue detail is required. *CECT* - **Contrast-enhanced CT (CECT)** of the head is reserved for specific indications like evaluating vascular lesions (e.g., aneurysms, arteriovenous malformations) or tumors, which are generally **not the primary concern** in the initial assessment of acute head trauma. - Administering contrast agents can delay imaging, may pose risks to patients with renal impairment or allergies, and does not significantly improve the detection of acute traumatic hemorrhage compared to NCCT. *X-ray* - **X-rays** of the skull are useful for detecting **skull fractures**, but they provide **limited information** regarding intracranial injuries or soft tissue damage, which are critical in head trauma. - They have largely been superseded by CT scans, which offer a more comprehensive view of both bony structures and intracranial contents.
Question 7: A polytrauma patient's CT brain shows a crescent-shaped extra-axial collection with a concave inner margin. What is the most likely diagnosis?
- A. EDH
- B. SDH (Correct Answer)
- C. Contusion
- D. Diffuse axonal injury
Explanation: ***SDH*** - The image shows a **crescent-shaped collection** of hemorrhage with a concave inner margin, consistent with a **subdural hematoma** (SDH). - SDHs result from the tearing of **bridging veins** and typically conform to the brain's surface, crossing suture lines but not limited by bony sutures. *EDH* - An **epidural hematoma (EDH)** characteristically appears as a **lenticular** or **biconvex** shape on CT, not crescent-shaped. - EDHs are typically caused by arterial bleeding, often from the **middle meningeal artery**, and are limited by cranial sutures. *Contusion* - A **contusion** is brain tissue bruising that appears as **heterogeneous areas** of hemorrhage and edema within the brain parenchyma itself. - It would not manifest as a distinct extra-axial collection with a smooth, concave margin. *Diffuse axonal injury* - **Diffuse axonal injury (DAI)** involves widespread microscopic damage to axons, often at the gray-white matter junction. - It may appear as *punctate hemorrhages* or **small lesions** at these junctions on CT, but often the CT can be normal, and it would not present as a large extra-axial collection.
Question 8: Depth of Anesthesia is best measured by:
- A. TOF
- B. MAC
- C. BIS (Correct Answer)
- D. Post Tetanic Potentiation
Explanation: ***BIS*** - The **BIS (Bispectral Index)** is an EEG-derived parameter that provides a quantitative measure of the patient's level of consciousness or depth of anesthesia. - A typical range for adequate surgical anesthesia is a BIS score between **40 and 60**, indicating a low probability of consciousness and recall. *TOF* - **TOF (Train-of-Four)** monitoring is used to assess the level of neuromuscular blockade, measuring the response of a muscle to a series of four electrical stimuli. - While important for managing **muscle relaxants**, it does not directly measure the depth of anesthesia or consciousness. *MAC* - **MAC (Minimum Alveolar Concentration)** is a measure of the potency of an inhaled anesthetic, defined as the concentration at which 50% of patients do not respond to a surgical stimulus. - It reflects the **ED50 of the anesthetic agent** itself rather than the patient's individual depth of anesthesia at a given moment. *Post Tetanic Potentiation* - **Post Tetanic Potentiation (PTP)** is a phenomenon observed during neuromuscular monitoring where a single twitch response is enhanced following a brief tetanus (rapid series of high-frequency stimuli). - PTP is used to assess **deep neuromuscular blockade** and recovery from paralytics, not the depth of anesthesia.
Question 9: Best investigation to detect rupture of silicone breast implants is-
- A. Mammography
- B. X-ray
- C. MRI (Correct Answer)
- D. USG
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is considered the **gold standard** for detecting silicone breast implant ruptures due to its superior soft tissue contrast and ability to differentiate silicone from other tissues. - It can accurately identify both **intracapsular** (linguine sign) and **extracapsular** ruptures, as well as associated silicone granulomas. *Mammography* - While useful for breast cancer screening, **mammography** has limited sensitivity for detecting silicone implant ruptures, especially subtle ones. - It can show indirect signs like implant contour abnormalities or increased implant density but is often inconclusive for rupture diagnosis. *X-ray* - **X-rays** provide very little information regarding the integrity of silicone breast implants because silicone is radiolucent and does not show up clearly on standard radiographs. - Its utility is primarily for detecting calcifications or foreign bodies, not implant rupture. *USG* - **Ultrasound (USG)** can be a useful initial screening tool for detecting implant ruptures, showing signs like the **"stepladder sign"** for intracapsular rupture or anechoic collections (silicone outside the capsule). - However, its accuracy is highly operator-dependent, and it may miss subtle ruptures or be limited by poor visualization due to scar tissue, making MRI a more definitive choice.
Question 10: Parameningeal Rhabdomyosarcoma is best diagnosed by:
- A. MRI (Correct Answer)
- B. CT Scan
- C. SPECT
- D. PET
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** provides excellent soft tissue contrast, which is crucial for visualizing the extent of **parameningeal rhabdomyosarcoma** and its relationship to critical structures like the **meninges**, **brainstem**, and **cranial nerves**. - It is superior for detecting **intracranial extension**, **bone erosion**, and assessing response to treatment, making it the preferred imaging modality for diagnosis and staging. *CT Scan* - **Computed Tomography (CT) scans** are good for evaluating bone involvement and calcifications but offer less detailed soft tissue resolution compared to MRI. - While it can identify large masses, it may miss subtle extensions or involvement of the **meninges** that are readily seen on MRI. *SPECT* - **Single-Photon Emission Computed Tomography (SPECT)** is a nuclear medicine imaging technique primarily used to assess organ function and blood flow, often in cardiology or neurology for functional studies. - It provides limited anatomical detail for the precise localization and characterization of soft tissue tumors like **rhabdomyosarcoma**. *PET* - **Positron Emission Tomography (PET) scans** are excellent for detecting metabolically active tumors, assessing disease burden, and identifying distant metastases, especially when combined with CT (**PET/CT**). - However, while useful for staging and follow-up, it does not provide the high-resolution anatomical detail of the primary tumor's local extent and its relationship to adjacent structures as effectively as **MRI**.
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