Anatomical Basis of Trauma — MCQs
Which of the following is false regarding cranial trauma?
Blunt trauma to right side of chest, hyperresonance on right side on percussion, dyspnea, tachypnea. Heart rate-100, BP-120/80, best initial diagnostic step is
A patient sustained trauma to the left side of the chest and abdomen. Fluid in the peritoneum and signs of hypotension were found on physical examination. What is the most probable diagnosis?
All of the following are true about direct trauma, except which of the following?
What is the correct sequence of management in a patient who presents to the casualty with an RTA? 1. Cervical spine stabilization 2. Intubation 3. IV cannulation 4. CECT
Hinge fracture is seen in
In a child who has been raped, the hymen:
Following a head injury, a man lost his tears from both eyes. Absence of lacrimation is due to injury to which structure?
Which of the following statements about the location of the otic ganglion is correct?
Which nerve is damaged in anterior dislocation of shoulder:
Anatomical Basis of Trauma Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is false regarding cranial trauma?
- A. Depressed skull is associated with brain injury at the immediate area of impact
- B. Raccoon eyes seen in subgaleal hemorrhage (Correct Answer)
- C. Carotid-cavernous fistula occur in base skull
- D. Post traumatic epilepsy seen in 15%
Explanation: ***Raccoon eyes seen in subgaleal hemorrhage*** - **Raccoon eyes** (periorbital ecchymosis) are typically seen with **anterior cranial fossa fractures**, not subgaleal hemorrhage. - Subgaleal hemorrhage is a collection of blood between the galea aponeurotica and the periosteum, usually causing diffuse **scalp swelling**. *Depressed skull is associated with brain injury at the immediate area of impact* - A depressed skull fracture means a portion of the skull is pushed inward, directly impacting the underlying **brain tissue**. - This can lead to localized **contusions**, **lacerations**, or **hematomas** at the site of impact. *Carotid-cavernous fistula occur in base skull* - **Carotid-cavernous fistulas** (CCF) commonly result from **traumatic rupture** of the internal carotid artery within the **cavernous sinus**. - This type of injury is often associated with **severe skull base fractures**, particularly those involving the sphenoid bone. *Post traumatic epilepsy seen in 15%* - The incidence of **post-traumatic epilepsy** (PTE) after severe head injury ranges from 5% to 15%, making 15% a plausible, though upper-end, estimate. - Risk factors for PTE include **depressed skull fractures**, **intracranial hematomas**, and **early seizures**.
Question 2: Blunt trauma to right side of chest, hyperresonance on right side on percussion, dyspnea, tachypnea. Heart rate-100, BP-120/80, best initial diagnostic step is
- A. Needle decompression
- B. Chest X-ray (Correct Answer)
- C. O2 inhalation
- D. IV fluids
Explanation: ***Chest Xray*** - The symptoms (blunt chest trauma, dyspnea, tachypnea, hyperresonance on percussion) are highly suggestive of a **pneumothorax**. - A **Chest X-ray** is the **best initial diagnostic step** to confirm the diagnosis, determine its size, and rule out other life-threatening conditions like hemothorax or tension pneumothorax. *Needle decompression* - This is a **therapeutic intervention** for a **tension pneumothorax**, not a diagnostic step. - While the symptoms are concerning, without confirmation of a tension pneumothorax (e.g., severe hypotension, tracheal deviation, absent breath sounds), empirical needle decompression is not the first step. *O2 inhalation* - **Oxygen administration** is a supportive measure for dyspnea and hypoxemia but does not diagnose the underlying cause of the respiratory distress. - While often given immediately, it's not the primary diagnostic step to understand the chest injury. *IV fluids* - **Intravenous fluids** are used to manage hypovolemia or shock, which is not indicated by the patient's current stable blood pressure (120/80 mmHg). - There is no clinical evidence of significant blood loss or dehydration from the provided information to warrant IV fluids as the best initial step.
Question 3: A patient sustained trauma to the left side of the chest and abdomen. Fluid in the peritoneum and signs of hypotension were found on physical examination. What is the most probable diagnosis?
- A. Diaphragmatic injury
- B. Rib fracture
- C. Renal injury
- D. Splenic injury (Correct Answer)
Explanation: ***Splenic injury*** - Trauma to the left lower chest and upper abdomen, coupled with signs of **hypovolemic shock** (hypotension) and **intraperitoneal fluid** (blood), is highly suggestive of **splenic injury**. - The **spleen** is one of the most commonly injured solid organs in blunt abdominal trauma due to its vascularity and location. *Diaphragmatic injury* - While trauma to the left chest can cause diaphragmatic injury, it typically presents with **respiratory distress** and potential **herniation of abdominal organs** into the chest. - Though it can cause internal bleeding, the primary presentation is not usually significant hypotension from isolated peritoneal fluid. *Rib fracture* - Rib fractures are common with chest trauma and can cause severe pain and bruising, but **isolated rib fractures** do not typically lead to significant **intraperitoneal fluid** and **hypotension**. - Multiple rib fractures can cause internal bleeding, but usually associated with pulmonary compromise rather than isolated peritoneal signs. *Renal injury* - Renal injury would typically cause **hematuria** and potentially **retroperitoneal bleeding**, which might not present as significant free fluid in the peritoneum. - While it can lead to hypotension, the location of the pain (left side) and nature of fluid (peritoneal) points away from an isolated renal injury.
Question 4: All of the following are true about direct trauma, except which of the following?
- A. An example of direct trauma is a tooth being struck by a baseball bat.
- B. This usually involves anterior dentition
- C. When the tooth itself is struck against a surface or when an object strikes a tooth or teeth
- D. This type of trauma favors crown or crown root fractures in the premolar or molar region; also possibility of jaw fractures (Correct Answer)
Explanation: ***This type of trauma favors crown or crown root fractures in the premolar or molar region; also possibility of jaw fractures*** - **Direct trauma** typically affects the **anterior teeth**, leading to crown and root fractures, rather than the premolar or molar regions. - Fractures in the **premolar or molar region** are more characteristic of **indirect trauma**, which often involves the jaw closing suddenly against an object. *An example of direct trauma is a tooth being struck by a baseball bat.* - This is a classic example of **direct trauma**, where an external object directly impacts the tooth. - The force from the impact is directly applied to the tooth surface, causing injury. *This usually involves anterior dentition* - **Anterior teeth** (incisors and canines) are most commonly exposed and susceptible to direct impact. - Their position in the front of the mouth makes them vulnerable to various forms of direct contact. *When the tooth itself is struck against a surface or when an object strikes a tooth or teeth* - This accurately describes the mechanism of **direct trauma**. - It involves a direct collision between the tooth and an object or another surface.
Question 5: What is the correct sequence of management in a patient who presents to the casualty with an RTA? 1. Cervical spine stabilization 2. Intubation 3. IV cannulation 4. CECT
- A. 2,1,4,3
- B. 1,3,2,4
- C. 2,1,3,4
- D. 1,2,3,4 (Correct Answer)
Explanation: ***1,2,3,4*** - This sequence follows the **ATLS (Advanced Trauma Life Support)** protocol, prioritizing immediate life threats in order. - **Cervical spine stabilization** is the **first action upon patient contact** to prevent secondary neurological injury in any trauma patient. - **Airway management (intubation)** is then performed **with maintained in-line c-spine stabilization** - these occur nearly simultaneously but c-spine protection is instituted first. - **IV cannulation (circulation)** follows to establish vascular access for resuscitation and medications. - **CECT (imaging)** is performed last, once the patient is stabilized after addressing immediate life threats. - This follows the **ATLS Primary Survey: Airway (with c-spine protection) → Breathing → Circulation → Disability → Exposure**. *2,1,4,3* - This incorrectly places intubation **before** cervical spine stabilization is initiated. - In ATLS, **c-spine protection must be applied immediately upon patient contact** before any airway manipulation. - Delaying IV cannulation until after CECT is inappropriate as circulatory access is critical for early resuscitation. *1,3,2,4* - While this correctly starts with cervical spine stabilization, it incorrectly places **IV cannulation before intubation**. - In the ATLS primary survey, **Airway comes before Circulation** - securing the airway takes priority over establishing IV access. - This sequence could delay critical airway management in a patient with respiratory compromise. *2,1,3,4* - This sequence places **intubation before cervical spine stabilization**, which violates ATLS principles. - **C-spine stabilization must be the first action** upon approaching any trauma patient to prevent secondary spinal cord injury. - While intubation with in-line stabilization is possible, the c-spine protection must be instituted first, not after beginning airway manipulation.
Question 6: Hinge fracture is seen in
- A. Posterior cranial fossa
- B. Anterior cranial fossa
- C. Middle cranial fossa (Correct Answer)
- D. Vault
Explanation: ***Middle cranial fossa*** - A **hinge fracture** is a term sometimes used to describe a **linear skull fracture** that extends across the floor of the **middle cranial fossa**. - This type of fracture often involves the **temporal bone** and can lead to damage to structures within, such as the facial nerve or auditory ossicles. *Posterior cranial fossa* - Fractures in the **posterior cranial fossa** are usually related to trauma to the back of the head. - While they can be severe and involve the occipital bone, they are not typically referred to as hinge fractures. *Anterior cranial fossa* - Fractures of the **anterior cranial fossa** commonly involve the frontal bone, ethmoid bone, or sphenoid bone. - These fractures can cause **CSF rhinorrhea** or periorbital ecchymosis (raccoon eyes), but the term hinge fracture is not associated with this location. *Vault* - Fractures of the **cranial vault** typically refer to fractures of the flat bones forming the top and sides of the skull. - These can be linear, depressed, or comminuted, but the characteristic "hinge" description specifically applies to the base of the skull, particularly the middle fossa.
Question 7: In a child who has been raped, the hymen:
- A. May be perforated due to trauma. (Correct Answer)
- B. May be perforated if it were superficial.
- C. Will be intact due to its anatomical position.
- D. Will be intact because it is deep situated
Explanation: ***May be perforated due to trauma.*** - The **hymen is a delicate membrane** that can be easily torn or perforated during sexual assault, especially with forceful penetration. - While hymenal tears are a strong indicator of sexual abuse, a lack of tears does not definitively rule out assault, as the hymen can be **elastic or already have natural openings**. *May be perforated if it were superficial.* - The **depth or superficiality of the hymen** is not the primary determinant of whether it will perforate during rape. - The force and nature of penile or foreign object penetration are more significant factors than its anatomical position for perforation. *Will be intact due to its anatomical position.* - The **hymen's anatomical position near the vaginal opening** makes it vulnerable to physical trauma during sexual assault. - Due to its delicate nature, it is often among the first structures to show signs of injury from forced penetration. *Will be intact because it is deep situated* - The hymen is typically located at the **entrance of the vagina**, not deep within it, making it susceptible to injury during sexual penetration. - Its relative position means it is frequently affected by trauma associated with rape, rather than being protected by depth.
Question 8: Following a head injury, a man lost his tears from both eyes. Absence of lacrimation is due to injury to which structure?
- A. Greater petrosal nerve (Correct Answer)
- B. Supraorbital nerve
- C. Tympanic plexus
- D. Nasociliary nerve
Explanation: ***Greater petrosal nerve*** - The **greater petrosal nerve** carries **parasympathetic preganglionic fibers** from the facial nerve (CN VII) that are destined for the **lacrimal gland**. - Damage to this nerve before it synapses in the **pterygopalatine ganglion** would result in the loss of **lacrimation**. *Supraorbital nerve* - The **supraorbital nerve** is a branch of the **ophthalmic division of the trigeminal nerve (CN V1)** and provides **sensory innervation** to the forehead, upper eyelid, and scalp. - It does not carry fibers for lacrimal gland function. *Tympanic plexus* - The **tympanic plexus** is formed by branches of the **glossopharyngeal nerve (CN IX)** and provides **parasympathetic innervation to the parotid gland** for salivation. - It plays no role in lacrimal gland function. *Nasociliary nerve* - The **nasociliary nerve** is a branch of the **ophthalmic division of the trigeminal nerve (CN V1)** and provides **sensory innervation** to the eyeball, conjunctiva, and part of the nasal mucosa. - It does not carry fibers for lacrimal gland secretion.
Question 9: Which of the following statements about the location of the otic ganglion is correct?
- A. Anterior to middle meningeal artery
- B. Lateral to mandibular nerve
- C. Inferior to foramen ovale (Correct Answer)
- D. Lateral to tensor veli palatini
Explanation: ***Inferior to foramen ovale*** - The **otic ganglion** is a small parasympathetic ganglion located in the **infratemporal fossa**. - It is consistently found just **inferior to the foramen ovale**, often within the fossa medial to the mandibular nerve. *Lateral to tensor veli palatini* - The otic ganglion is actually located **medial** (or superficial) to the origin of the **tensor veli palatini muscle**. - Its position is more closely associated with the medial pterygoid muscle and the Eustachian tube. *Lateral to mandibular nerve* - The otic ganglion is typically situated **medial** to the **mandibular nerve (V3)**, specifically medial to its main trunk or branches near the foramen ovale. - It is closely applied to the medial aspect of the mandibular nerve. *Anterior to middle meningeal artery* - The **middle meningeal artery** typically passes **lateral** to the otic ganglion as it ascends through the foramen spinosum. - Therefore, the ganglion is generally located **medial** or posterior to the artery, not anterior.
Question 10: Which nerve is damaged in anterior dislocation of shoulder:
- A. Median
- B. Axillary (Correct Answer)
- C. Musculocutaneous
- D. Radial
Explanation: **Axillary** - The **axillary nerve** wraps around the surgical neck of the humerus, which is vulnerable to injury during an **anterior shoulder dislocation**. - Damage to the axillary nerve can lead to **deltoid muscle weakness** (impaired shoulder abduction) and sensory loss over the **regimental badge area**. *Median* - The **median nerve** is typically not directly affected by an anterior shoulder dislocation. - It supplies most of the flexor muscles of the forearm and thenar eminence, and sensory innervation to the lateral palm and digits. *Musculocutaneous* - The **musculocutaneous nerve** innervates the biceps brachii and brachialis muscles, and provides sensory innervation to the lateral forearm. - It is less commonly injured in a shoulder dislocation compared to the axillary nerve. *Radial* - The **radial nerve** typically runs posterior to the humerus in the spiral groove and is more commonly injured in mid-shaft humeral fractures rather than shoulder dislocations. - Damage to the radial nerve manifests as **wrist drop** and sensory loss over the posterior forearm and hand.
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