Radiologic landmarks US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Radiologic landmarks. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Radiologic landmarks US Medical PG Question 1: A 27-year-old male presents to the Emergency Room as a code trauma after being shot in the neck. En route, the patient's blood pressure is 127/73 mmHg, pulse is 91/min, respirations are 14/min, and oxygen saturation is 100% on room air with GCS of 15. On physical exam, the patient is in no acute distress; however, there is an obvious entry point with oozing blood near the left lateral neck above the cricoid cartilage with a small hematoma that is non-pulsatile and stable since arrival. The rest of the physical exam is unremarkable. Rapid hemoglobin returns back at 14.1 g/dL. After initial resuscitation, what is the next best step in management?
- A. Bedside neck exploration
- B. Conventional angiography
- C. MRI
- D. Plain radiography films
- E. CT angiography (Correct Answer)
Radiologic landmarks Explanation: ***CT angiography***
- **CT angiography** is the most appropriate next step for **stable patients** with penetrating neck trauma, like this patient, to evaluate for vascular and airway injuries.
- It offers **rapid, non-invasive assessment** of the extent of injury and helps guide further management.
*Bedside neck exploration*
- **Bedside neck exploration** is typically reserved for patients with **hard signs** of vascular injury (e.g., active hemorrhage, expanding hematoma, pulsatile hematoma) or **signs of airway compromise**, which are absent here.
- This patient is **hemodynamically stable** and has a non-expanding hematoma.
*Conventional angiography*
- **Conventional angiography** is more **invasive** and time-consuming than CTA, carrying risks such as arterial dissection or stroke.
- It is usually reserved for **diagnostic confirmation** or **therapeutic intervention** (e.g., embolization) after initial imaging, especially when CTA findings are equivocal or reveal treatable lesions.
*MRI*
- **MRI** is generally **contraindicated** in acute trauma situations, especially when the presence of metallic foreign bodies (e.g., bullet fragments) is a concern.
- Its **longer acquisition time** and **lack of immediate availability** in the emergency setting make it less suitable for initial evaluation of penetrating neck trauma.
*Plain radiography films*
- **Plain radiographs** can identify **bony fractures** and the general location of foreign bodies, but they offer **limited information** regarding soft tissue and vascular structures.
- They are insufficient for comprehensively evaluating potential vascular or airway injuries in penetrating neck trauma.
Radiologic landmarks US Medical PG Question 2: A 36-year-old male is taken to the emergency room after jumping from a building. Bilateral fractures to the femur were stabilized at the scene by emergency medical technicians. The patient is lucid upon questioning and his vitals are stable. Pain only at his hips was elicited. Cervical exam was not performed. What is the best imaging study for this patient?
- A. AP and lateral radiographs of hips
- B. Lateral radiograph (x-ray) of hips
- C. Magnetic resonance imaging (MRI) of hips, knees, lumbar, and cervical area
- D. Anterior-posterior (AP) and lateral radiographs of hips, knees, lumbar, and cervical area
- E. Computed tomography (CT) scan of cervical spine, hips, and lumbar area (Correct Answer)
Radiologic landmarks Explanation: ***Computed tomography (CT) scan of cervical spine, hips, and lumbar area***
- In **high-energy trauma** (fall from height), a CT scan is the **gold standard** for evaluating the **spine and pelvis**, providing detailed cross-sectional images superior to plain radiographs.
- Since the **cervical exam was not performed**, cervical spine imaging is **mandatory** per ATLS (Advanced Trauma Life Support) protocols. High-energy falls carry significant risk of **cervical spine injury** even without obvious neurological symptoms.
- CT allows comprehensive assessment of **hip fractures, pelvic injuries, and the entire spine** (cervical, thoracic, lumbar), identifying both obvious and **subtle fractures** that may be missed on plain films.
- This approach provides the most **efficient and thorough evaluation** in the acute trauma setting, allowing for appropriate surgical planning and ruling out life-threatening spinal instability.
*AP and lateral radiographs of hips*
- Plain radiographs provide **limited detail** and may **miss subtle fractures**, particularly in complex areas like the pelvis and acetabulum.
- This option **fails to address cervical spine clearance**, which is essential in all high-energy trauma patients, especially when cervical exam has not been performed.
- Radiographs are insufficient for **comprehensive trauma evaluation** after a fall from height.
*Lateral radiograph (x-ray) of hips*
- A single lateral view is **grossly insufficient** for evaluating hip and pelvic fractures, providing only a **two-dimensional perspective** that can miss significant injuries.
- This option **completely neglects spinal evaluation**, which is dangerous in an uncleared trauma patient with a high-energy mechanism.
*Magnetic resonance imaging (MRI) of hips, knees, lumbar, and cervical area*
- While MRI excels at evaluating **soft tissues, ligaments, and bone marrow**, it is **not the initial imaging modality** for acute bony trauma due to longer scan times and lower sensitivity for acute fractures compared to CT.
- MRI is **time-consuming and impractical** in the emergency setting for initial fracture assessment, potentially delaying definitive treatment.
- CT is superior for evaluating **acute skeletal injuries** in the trauma bay.
*Anterior-posterior (AP) and lateral radiographs of hips, knees, lumbar, and cervical area*
- Multiple plain radiographs have **limited sensitivity** for complex or non-displaced fractures, particularly in the **spine and pelvis**, making them inadequate for high-energy trauma evaluation.
- Obtaining multiple radiographic views requires **numerous patient repositionings**, which risks further injury if **spinal instability** is present.
- Plain films provide significantly **less diagnostic information** than CT scanning for trauma assessment.
Radiologic landmarks US Medical PG Question 3: A 36-year-old woman comes to the physician for a 2-month history of urinary incontinence and a vaginal mass. She has a history of five full-term normal vaginal deliveries. She gave birth to a healthy newborn 2-months ago. Since then she has felt a sensation of vaginal fullness and a firm mass in the lower vagina. She has loss of urine when she coughs, sneezes, or exercises. Pelvic examination shows an irreducible pink globular mass protruding out of the vagina. A loss of integrity of which of the following ligaments is most likely involved in this patient's condition?
- A. Infundibulopelvic ligament
- B. Broad ligament of the uterus
- C. Cardinal ligament of the uterus (Correct Answer)
- D. Round ligament of uterus
- E. Uterosacral ligament
Radiologic landmarks Explanation: ***Cardinal ligament of the uterus***
- The patient's symptoms, including **vaginal mass**, **urinary incontinence** with coughing/sneezing, and history of **multiple vaginal deliveries**, strongly suggest **uterine prolapse**.
- The cardinal ligaments are crucial in providing **lateral cervical support** and are often damaged during childbirth, leading to uterine descent.
*Infundibulopelvic ligament*
- This ligament primarily supports the **ovaries** and contains the **ovarian artery** and vein.
- Damage to this ligament is associated with ovarian prolapse or complications during oophorectomy, not uterine prolapse.
*Broad ligament of the uterus*
- The broad ligament is a **peritoneal fold** that drapes over the uterus, fallopian tubes, and ovaries.
- While it helps to hold these structures in place, its primary role is not in preventing uterine prolapse; it mainly provides a medium for neurovascular structures.
*Round ligament of uterus*
- The round ligament extends from the uterus to the **labia majora** and primarily helps maintain **anteversion** of the uterus.
- It plays a minor role in uterine support and its laxity is not a primary cause of uterine prolapse.
*Uterosacral ligament*
- The uterosacral ligaments provide **posterior support** to the uterus, particularly by anchoring the cervix to the sacrum.
- While damage to these ligaments contributes to **apical prolapse**, the cardinal ligaments are more critical for lateral support and more commonly implicated in overall uterine prolapse following childbirth.
Radiologic landmarks US Medical PG Question 4: A 42-year-old woman comes to the physician because of a 12 month history of progressive fatigue and shortness of breath with exertion. Five years ago, she emigrated from Eastern Europe. She has smoked one pack of cigarettes daily for 20 years. She has a history of using methamphetamines and cocaine but quit 5 years ago. Vital signs are within normal limits. Physical examination shows jugular venous pulsations 9 cm above the sternal angle. The lungs are clear to auscultation. There is a normal S1 and a loud, split S2. An impulse can be felt with the fingers left of the sternum. The abdomen is soft and nontender. The fingertips are enlarged and the nails are curved. There is pitting edema around the ankles bilaterally. An x-ray of the chest shows pronounced central pulmonary arteries and a prominent right heart border. Which of the following is most likely to confirm the diagnosis?
- A. CT angiography
- B. Serologic testing
- C. Doppler echocardiography
- D. High-resolution CT of the lung
- E. Right-heart catheterization (Correct Answer)
Radiologic landmarks Explanation: ***Right-heart catheterization***
- This is the **gold standard** for diagnosing **pulmonary hypertension** by directly measuring pulmonary artery pressure, pulmonary wedge pressure, and cardiac output. The patient's symptoms (fatigue, shortness of breath, loud split S2, prominent right heart border, JVP elevation, peripheral edema, digital clubbing) strongly suggest pulmonary hypertension.
- It helps classify the type of pulmonary hypertension and guides treatment strategies, as **mean pulmonary artery pressure (mPAP) > 20 mmHg** at rest is diagnostic.
*CT angiography*
- Primarily used to diagnose **pulmonary embolism** or to evaluate for chronic thromboembolic pulmonary hypertension (CTEPH). While helpful in some cases of pulmonary hypertension, it does not directly measure pressures.
- It would show emboli or chronic organized thrombi if present but doesn't provide the hemodynamic data needed to confirm the severity and type of pulmonary hypertension.
*Serologic testing*
- Used to identify underlying systemic diseases (e.g., **autoimmune conditions like scleroderma**) that can cause pulmonary hypertension. However, it does not directly confirm the diagnosis of pulmonary hypertension itself.
- While it may uncover **etiological factors**, serological markers are not diagnostic for the presence or severity of pulmonary hypertension.
*Doppler echocardiography*
- A crucial initial screening tool that **estimates pulmonary artery pressure** and assesses right ventricular function, often prompting further investigation for pulmonary hypertension.
- While highly suggestive, it is **indirect and an estimation**, and thus not considered definitive for confirming the diagnosis or for precise hemodynamic measurements.
*High-resolution CT of the lung*
- Used to evaluate for **interstitial lung disease** or other parenchymal lung conditions that can cause secondary pulmonary hypertension.
- It provides detailed images of the lung parenchyma but does not directly measure pulmonary pressures or confirm the diagnosis of pulmonary hypertension.
Radiologic landmarks US Medical PG Question 5: A 65-year-old man with a 40-pack-year smoking history presents with hemoptysis and a persistent cough. Chest CT shows a 3.5 cm centrally located mass in the right main bronchus. Positron emission tomography confirms a malignant nodule. Bronchoscopy with transbronchial biopsy is performed and a specimen sample of the nodule is sent for frozen section analysis. The tissue sample is most likely to show which of the following tumor types?
- A. Carcinoid tumor
- B. Metastasis of colorectal cancer
- C. Small cell lung carcinoma
- D. Large cell carcinoma
- E. Squamous cell carcinoma (Correct Answer)
Radiologic landmarks Explanation: ***Squamous cell carcinoma***
- This is the most likely diagnosis given the **central location** in the main bronchus, **heavy smoking history**, and presentation with **hemoptysis**.
- **Squamous cell carcinoma** accounts for 25-30% of lung cancers and characteristically arises in **central/proximal airways**, making it readily accessible by **bronchoscopy**.
- Histologically, it shows **keratin pearls** and **intercellular bridges** on biopsy.
- The **central endobronchial location** and ability to obtain tissue via transbronchial biopsy strongly favor squamous cell over peripheral tumors.
*Carcinoid tumor*
- **Carcinoid tumors** are **neuroendocrine tumors** that can present as central endobronchial masses and cause hemoptysis.
- However, they are typically **slow-growing** with more indolent presentation, and PET scans show **variable uptake** (often less intense than aggressive carcinomas).
- They represent only **1-2% of lung tumors** and occur more commonly in **younger, non-smoking patients**.
*Metastasis of colorectal cancer*
- While lung is a common site for **colorectal metastases**, these typically present as **multiple peripheral nodules** rather than a solitary central endobronchial mass.
- The clinical presentation strongly suggests **primary lung cancer** rather than metastatic disease.
- Without history of colorectal cancer, this is unlikely.
*Small cell lung carcinoma*
- **Small cell lung carcinoma** (SCLC) represents 15% of lung cancers and typically presents as a **large central mass** with early mediastinal involvement.
- However, SCLC is usually **too extensive at presentation** for transbronchial biopsy alone and often requires mediastinoscopy or CT-guided biopsy.
- Histology shows **small cells with scant cytoplasm**, **salt-and-pepper chromatin**, and **oat-cell morphology**.
- While possible, the single accessible endobronchial mass is more characteristic of squamous cell.
*Large cell carcinoma*
- **Large cell carcinoma** is a **diagnosis of exclusion** made when tumors lack features of adenocarcinoma, squamous cell, or small cell differentiation.
- It typically presents as **large peripheral masses** rather than central endobronchial lesions.
- It represents only **10% of lung cancers** and is less common than squamous cell carcinoma in this clinical scenario.
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