Emergency Radiology Practice Questions

Q: A 24-year-old male presents to the emergency department after a road traffic accident. Based on the given CT scan, what is the most likely diagnosis?

Epidural hematoma. ***Epidural hematoma*** - Characterized by a **biconvex (lens-shaped)** hyperdensity on CT scan that **does not cross suture lines**. - Classically associated with a **rupture of the middle meningeal artery** following a **temporal bone fracture**, often presenting with a **lucid interval**. *Subdural hematoma* - Appears as a **crescent-shaped** hyperdensity on CT that **crosses suture lines** but is limited by dural reflections. - Typically results from the **tearing of bridging veins** and is more common in **elderly patients** or alcoholics due to cerebral atrophy. *Intracerebral hemorrhage* - Presents as a **focal hyperdense collection** within the **brain parenchyma** itself, rather than in the extra-axial spaces. - Frequently caused by **hypertensive emergencies**, trauma, or **cerebral amyloid angiopathy**. *Subarachnoid hemorrhage* - Characterized by hyperdensity appearing in the **sulci, fissures, and cisterns** (following the contours of the brain) rather than causing focal mass effect. - Most typically presents with a **thunderclap headache**, often due to a **ruptured berry aneurysm**.

Q: The "tear drop sign" is characteristic of which of the following conditions?

Orbital floor fracture. **Explanation:** The **"Tear Drop Sign"** is a classic radiological finding in **Orbital Floor Fractures** (specifically Blow-out fractures). It refers to a soft tissue mass hanging from the roof of the maxillary sinus on a Water’s view (occipitomental projection) or CT scan. This "teardrop" appearance is caused by the herniation of orbital fat and the **inferior rectus muscle** through the fractured orbital floor into the maxillary sinus. **Why the other options are incorrect:** * **Zygomatic bone fracture:** Typically presents with the "Tripod fracture" pattern (involving the zygomatic arch, inferior orbital rim, and zygomaticomaxillary buttress). It does not produce a localized teardrop herniation. * **Mandibular fracture:** These are usually diagnosed by identifying cortical breaks or displacement on an OPG (Orthopantomogram). Clinical signs include malocclusion and "step-off" deformities. * **Hyoid bone fracture:** A rare injury often associated with strangulation or direct neck trauma; it is diagnosed by lateral neck X-rays showing bone discontinuity, not sinus herniation. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Blunt trauma to the eye (e.g., a cricket ball or fist) increases intraorbital pressure, causing the thin orbital floor (maxillary bone) to "blow out." * **Clinical Sign:** Patients often present with **diplopia** (double vision) on upward gaze due to entrapment of the inferior rectus muscle and **enophthalmos** (sunken eye). * **Associated Nerve:** The **infraorbital nerve** is frequently involved, leading to anesthesia or paresthesia of the cheek and upper lip. * **Black Eyebrow Sign:** Another radiological sign of orbital fracture representing intraorbital emphysema (air from the sinuses entering the orbit).

Q: A 19-year-old boy presents with a swollen lip and fractured maxillary central incisors following trauma. The encircled area in the radiograph shows:

Fragment of the fractured tooth. ***Fragment of the fractured tooth*** - Following **dental trauma** with fractured central incisors, **tooth fragments** can become embedded in the soft tissues, particularly the lip, and appear as **radiopaque** structures on radiographs. - **Soft tissue radiographs** are essential in dental trauma cases to locate embedded **tooth fragments** that require surgical removal to prevent infection and foreign body reaction. *Calculus in the salivary duct* - **Sialolithiasis** (salivary stones) typically occurs in **major salivary ducts** like Wharton's duct or Stensen's duct, not in lip tissue. - These stones are usually associated with **salivary gland swelling** and **pain during eating**, which are not consistent with this trauma case. *Irritational calcinosis of the lips* - **Irritational calcinosis** is a rare condition involving **calcium deposits** in soft tissues due to chronic irritation, not acute trauma. - This condition typically develops over **months to years** and would not appear immediately following dental trauma. *None of the above* - Given the **clinical history** of dental trauma with fractured incisors and swollen lip, the radiopaque structure is most likely a **tooth fragment**. - The **temporal relationship** between trauma and radiographic findings makes tooth fragment the most probable diagnosis.

Q: Which imaging modality is the mainstay in trauma imaging?

Plain radiograph. **Explanation:** In the initial assessment of a trauma patient, **Plain Radiography (X-ray)** remains the mainstay and the first-line imaging modality. This is primarily due to its widespread availability, portability (allowing for bedside imaging in the resuscitation bay), and speed. Under the **ATLS (Advanced Trauma Life Support)** guidelines, the "Trauma Series" of X-rays—specifically the **Chest X-ray (CXR)** and **Pelvis X-ray (PXR)**—is crucial for identifying life-threatening conditions like tension pneumothorax, massive hemothorax, or unstable pelvic fractures during the primary survey. **Analysis of Options:** * **B. CT (Computed Tomography):** While CT is the "gold standard" for definitive diagnosis of internal organ injuries and craniofacial trauma, it is not the initial mainstay. It requires a hemodynamically stable patient and transport to the radiology suite, making it unsuitable for the immediate primary survey of an unstable patient. * **C. MRI:** MRI has limited utility in acute trauma due to long scan times, incompatibility with life-support equipment (metallic objects), and poor sensitivity for cortical bone fractures or acute hemorrhage compared to CT. * **D. Radionuclide Imaging:** This is used for functional assessment (e.g., bone scans for occult fractures) and has no role in the emergency management of acute trauma. **High-Yield Clinical Pearls for NEET-PG:** * **The Trauma Series:** Traditionally included Lateral C-spine, CXR, and PXR. Modern protocols often prioritize **eFAST** (Extended Focused Assessment with Sonography for Trauma) alongside CXR and PXR. * **Cervical Spine:** In many centers, CT has replaced X-ray for C-spine clearance if the patient is already undergoing a CT Polytrauma scan. * **Golden Hour:** The goal of plain films in trauma is to identify "killable" injuries within the first hour of management.

Q: The dependant viscera sign is seen in which of the following conditions?

Diaphragmatic rupture. ### Explanation **1. Why Diaphragmatic Rupture is Correct:** The **Dependent Viscera Sign** is a classic CT finding in **traumatic diaphragmatic rupture**. Under normal conditions, the diaphragm supports the abdominal organs (liver, spleen, and stomach), keeping them away from the posterior chest wall. When the diaphragm is ruptured, this support is lost. Consequently, the abdominal viscera "fall" posteriorly due to gravity and lie in direct contact with the posterior ribs or the posterior thoracic wall. This sign is highly specific (approx. 95%) for blunt diaphragmatic injury. **2. Analysis of Incorrect Options:** * **B. Fractured Bronchus:** This typically presents with the "Fallen Lung Sign" (the lung falls away from the hilum towards the dependent part of the hemithorax) and persistent pneumothorax despite chest tube drainage. * **C. Pneumoperitoneum:** This refers to free air in the peritoneal cavity. Key radiological signs include the Rigler sign (double wall sign), Cupola sign, or Football sign on an X-ray. * **D. Diaphragmatic Hernia:** While a rupture is a type of acquired hernia, the "Dependent Viscera Sign" specifically refers to the acute traumatic loss of diaphragmatic integrity where organs collapse against the posterior wall. Congenital hernias (like Bochdalek) usually have a well-defined hernial sac or defect edges that don't necessarily result in this specific "falling" appearance. **3. Clinical Pearls for NEET-PG:** * **Collar Sign:** Another specific sign for diaphragmatic rupture, representing a "waist-like" constriction of the herniated abdominal organs at the site of the diaphragmatic defect. * **Dangling Diaphragm Sign:** Seeing the free edge of the torn diaphragm. * **Most Common Side:** Diaphragmatic rupture is more common on the **left side** (the liver provides a protective cushioning effect on the right). * **Gold Standard Investigation:** Contrast-enhanced CT (CECT) of the chest and abdomen.

Q: Which radiographic view best visualizes zygoma fractures?

Occipitomental view. The **Occipitomental view (Water’s view)** is the gold standard radiographic projection for evaluating mid-facial fractures, particularly those involving the **zygoma** and the maxillary sinuses. ### Why Occipitomental View is Correct: In this projection, the patient’s chin is tilted up against the film, which displaces the dense petrous pyramids of the temporal bone downward, below the floor of the maxillary sinuses. This provides an unobstructed view of the **zygomatic bone, zygomatic arch, infraorbital rims, and the maxillary sinuses**. It is specifically used to diagnose the "Tripod fracture" (Zygomaticomaxillary complex fracture). ### Why Other Options are Incorrect: * **Lateral Oblique View:** Primarily used to visualize the body and ramus of the **mandible**, not the mid-face or zygoma. * **Towne’s View:** An AP axial projection used to visualize the **occipital bone** and the condylar processes of the mandible. It is the best view for mandibular condyle fractures. * **Lateral Skull View:** Useful for visualizing the sella turcica, paranasal sinuses (fluid levels), and calvarial fractures, but the superimposition of facial bones makes it poor for isolating zygomatic injuries. ### High-Yield Clinical Pearls for NEET-PG: * **Submentovertex View (Jug-handle view):** The best view for isolated fractures of the **zygomatic arch**. * **Black Line (Ames’ Line):** On a Water’s view, look for the "hanging drop" sign or disruption of the orbital floor (Blow-out fracture). * **Tripod Fracture:** Involves three points: the zygomaticofrontal suture, the infraorbital rim, and the zygomaticotemporal suture (arch). * **Caldwell View (Occipitofrontal):** Best for visualizing the frontal sinuses and superior orbital rims.

Q: Following a fight between 2 groups, a boy was brought with severe pain in the chest, distended neck veins, dyspnea, and a BP of 80/50 mmHg. X-ray shows the following findings: What is the diagnosis?

Tension Pneumothorax. ***Tension pneumothorax*** - The clinical presentation of severe dyspnea, **distended neck veins**, and **hypotension** (BP 80/50 mmHg) after trauma is a classic triad for tension pneumothorax, which is a medical emergency. - The chest X-ray confirms this diagnosis by showing a completely collapsed right lung with a significant **contralateral shift of the mediastinum and trachea** to the left, and flattening of the right hemidiaphragm, indicating high intrapleural pressure. *Primary Spontaneous Pneumothorax* - This type of pneumothorax occurs without any preceding trauma or underlying lung disease, typically in tall, thin young men due to the rupture of **apical blebs**. - The patient's presentation follows a fight, clearly indicating a **traumatic etiology**, which rules out a spontaneous pneumothorax. *Traumatic Pneumothorax* - While the cause is trauma, this is a less specific diagnosis. The term **Tension pneumothorax** is more accurate given the life-threatening signs of **hemodynamic instability** and **mediastinal shift**. - A simple traumatic pneumothorax does not typically involve the one-way valve mechanism that leads to the progressive accumulation of air and the resulting **obstructive shock** seen in this patient. *Bilateral Pneumothorax* - This diagnosis is incorrect as the chest X-ray clearly demonstrates a **unilateral** condition affecting only the right side. - The left lung, although compressed by the shifted mediastinum, remains inflated with visible lung markings extending to the chest wall.

Question 1

A 24-year-old male presents to the emergency department after a road traffic accident. Based on the given CT scan, what is the most likely diagnosis?

Accepted Answer

Epidural hematoma

Answer

Subdural hematoma

Answer

Intracerebral hemorrhage

Answer

Subarachnoid hemorrhage

Question 2

What kind of foreign bodies can be detected by MRI?

Accepted Answer

All of the above

Answer

Magnetic foreign bodies

Answer

Iron foreign bodies

Answer

Wooden foreign body

Question 3

Which of the following statements is false regarding the role of chest radiography in a patient presenting with acute abdomen?

Accepted Answer

A supine chest radiograph is the best modality for detecting a small pneumoperitoneum.

Answer

Several chest conditions can mimic symptoms of an acute abdominal condition.

Answer

Chest pathology can complicate an existing acute abdominal condition.

Answer

A normal chest radiograph can serve as a valuable baseline in the evaluation of acute abdomen.

Question 4

The "tear drop sign" is characteristic of which of the following conditions?

Accepted Answer

Orbital floor fracture

Answer

Zygomatic bone fracture

Answer

Mandibular fracture

Answer

Hyoid bone fracture

Question 5

A 19-year-old boy presents with a swollen lip and fractured maxillary central incisors following trauma. The encircled area in the radiograph shows:

Accepted Answer

Fragment of the fractured tooth

Answer

Calculus in the salivary duct

Answer

Irritational calcinosis of the lips

Answer

None of the above

Question 6

Which imaging modality is the mainstay in trauma imaging?

Accepted Answer

Plain radiograph

Answer

CT

Answer

MRI

Answer

Radionuclide imaging

Question 7

The dependant viscera sign is seen in which of the following conditions?

Accepted Answer

Diaphragmatic rupture

Answer

Fractured bronchus

Answer

Pneumoperitoneum

Answer

Diaphragmatic hernia

Question 8

Which radiographic view best visualizes zygoma fractures?

Accepted Answer

Occipitomental view

Answer

Lateral oblique view

Answer

Towne's view

Answer

Lateral skull view

Question 9

Pneumocephalus is most commonly seen with fractures of which anatomical structure?

Accepted Answer

Frontal sinus

Answer

Maxillary sinus

Answer

Sphenoid sinus

Answer

Mastoid antrum

Question 10

Following a fight between 2 groups, a boy was brought with severe pain in the chest, distended neck veins, dyspnea, and a BP of 80/50 mmHg. X-ray shows the following findings: What is the diagnosis?

Accepted Answer

Tension Pneumothorax

Answer

Primary Spontaneous Pneumothorax

Answer

Bilateral Pneumothorax

Answer

Traumatic Pneumothorax

Emergency Radiology — MCQs

Emergency Radiology — MCQs

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