Sphenoid Sinus Surgery — MCQs
A lady comes to OPD after fall from scooty. Her vitals are stable. She is having continuous, clear watery discharge from nose after 2 days. This is most likely a feature of?
Which of the following structures is located within the cavernous sinus?
All of the following structures lie outside the cavernous sinus except:
A patient with chronic nasal obstruction underwent a procedure 3 months ago and now presents with recurrent epistaxis, crusting, and the clinical image showing a septal perforation. What procedure was most likely carried out?
What is the treatment of choice for ethmoidal polyps?
Onodi cells and Haller cells are associated with which anatomical structures, respectively?
Deep head pain is most commonly associated with which of the following sinus conditions?
Carcinoma of maxillary sinus stage III {T3 N0 M0}, Treatment of choice is
Basal skull view (submentovertical view) X-ray is best to visualize which structures?
A boy has developed epistaxis. What is the treatment of choice?
Sphenoid Sinus Surgery Indian Medical PG Practice Questions and MCQs
Question 1: A lady comes to OPD after fall from scooty. Her vitals are stable. She is having continuous, clear watery discharge from nose after 2 days. This is most likely a feature of?
- A. CSF rhinorrhoea (Correct Answer)
- B. Acute respiratory infection
- C. Rhinitis
- D. Middle cranial fossa fracture
Explanation: ***CSF rhinorrhoea*** - **Clear watery discharge** appearing **two days after head trauma** (fall from scooty) is highly suggestive of **cerebrospinal fluid (CSF) rhinorrhoea**. - This occurs due to a breach in the **skull base**, allowing CSF to leak from the subarachnoid space into the nasal cavity. *Acute respiratory infection* - An acute respiratory infection typically presents with symptoms like **fever, cough**, and **nasal discharge** that is often thicker and discolored, not clear and watery. - The onset of discharge two days after trauma without other signs of infection also makes this less likely. *Rhinitis* - Rhinitis involves inflammation of the nasal mucosa, leading to watery discharge, sneezing, and congestion. - However, the traumatic etiology and the specific timing of the discharge make **CSF leak** a more pertinent diagnosis than simple rhinitis. *Middle cranial fossa fracture* - While a **middle cranial fossa fracture** can cause CSF leakage, the discharge from the nose (rhinorrhoea) typically originates from an **anterior cranial fossa fracture**. - A middle cranial fossa fracture is more commonly associated with **otorrhoea** (CSF leakage from the ear) if the temporal bone is involved.
Question 2: Which of the following structures is located within the cavernous sinus?
- A. Maxillary division of V nerve
- B. Mandibular division of V nerve
- C. Internal carotid artery (Correct Answer)
- D. Facial nerve
Explanation: ***Internal carotid artery*** - The **internal carotid artery** passes **through the lumen** of the cavernous sinus, which is a dural venous sinus located on either side of the sella turcica. - Along with the **abducens nerve (CN VI)**, the internal carotid artery is one of only two structures that passes directly through the cavernous sinus cavity itself. - This is the **most accurate answer** as it traverses the actual sinus space, not just the wall. *Maxillary division of V nerve* - The **maxillary division of the trigeminal nerve (V2)** runs within the **lateral wall** of the cavernous sinus, not through its lumen. - While technically "within" the sinus structure, it is embedded in the dural wall rather than passing through the blood-filled cavity. - This nerve exits the skull through the **foramen rotundum**. - Other nerves in the lateral wall include **CN III, CN IV, and V1**. *Mandibular division of V nerve* - The **mandibular division of the trigeminal nerve (V3)** does not pass through or near the cavernous sinus. - It exits the middle cranial fossa directly via the **foramen ovale**, positioned inferior and separate from the cavernous sinus. - V3 is the only division of the trigeminal nerve that does not have any relationship with the cavernous sinus. *Facial nerve* - The **facial nerve (CN VII)** has no anatomical relationship with the cavernous sinus. - It enters the temporal bone through the **internal acoustic meatus**, travels through the facial canal, and exits via the **stylomastoid foramen**. - Its course is entirely separate from the cavernous sinus region.
Question 3: All of the following structures lie outside the cavernous sinus except:
- A. Sphenoidal air sinus
- B. Maxillary nerve
- C. Internal carotid artery (Correct Answer)
- D. Foramen lacerum
Explanation: ***Internal carotid artery*** - The **internal carotid artery** passes directly through the **venous cavity** of the **cavernous sinus**, surrounded by venous blood. - This anatomical relationship is clinically significant, as trauma to the ICA within the sinus can lead to a **carotid-cavernous fistula**. - The ICA and the **abducent nerve (CN VI)** are the only structures that lie freely within the venous blood of the cavernous sinus. *Sphenoidal air sinus* - The **sphenoidal air sinus** is an air-filled cavity located inferior and anterior to the **cavernous sinus**, separated by a thin bony wall. - It is a distinct anatomical structure completely outside the cavernous sinus. *Maxillary nerve* - The **maxillary nerve (V2)** is located in the **lateral wall** of the cavernous sinus, embedded within the dura mater. - Unlike the ICA, it does **not** lie within the venous cavity itself, but rather within the thickness of the lateral wall. - It exits the skull through the **foramen rotundum** to enter the pterygopalatine fossa. - For the purposes of this question, structures in the lateral wall are considered separate from those within the venous space. *Foramen lacerum* - The **foramen lacerum** is an opening in the base of the skull, inferomedial to the **cavernous sinus**. - It is a bony aperture, not a structure within the cavernous sinus itself. - No major structures fully traverse the foramen lacerum as a completed entity in adults; instead, it is largely filled with fibrocartilage.
Question 4: A patient with chronic nasal obstruction underwent a procedure 3 months ago and now presents with recurrent epistaxis, crusting, and the clinical image showing a septal perforation. What procedure was most likely carried out?
- A. FESS (Functional Endoscopic Sinus Surgery)
- B. Caldwell-Luc's procedure
- C. Submucosal resection (SMR) (Correct Answer)
- D. Turbinate reduction surgery
Explanation: ***Submucosal resection (SMR)*** - **SMR** involves removing cartilage or bone from the nasal septum while preserving the septal mucosa. If both mucosal flaps are inadvertently damaged or devitalized during the procedure, it can lead to a **septal perforation** as a complication. - The symptoms of **recurrent epistaxis** and **crusting** are classic signs associated with compromised septal integrity and airflow changes due to a septal perforation, which commonly occurs weeks to months after such a procedure. *FESS (Functional Endoscopic Sinus Surgery)* - **FESS** is primarily used to treat chronic sinusitis by opening and ventilating the sinuses; it does not directly involve the nasal septum in a way that typically causes perforation. - While complications are possible, a septal perforation is not a common or direct consequence of FESS, which focuses on ethmoid, maxillary, frontal, or sphenoid sinus drainage pathways. *Caldwell-Luc's procedure* - The **Caldwell-Luc procedure** involves an incision above the canine fossa to access the maxillary sinus. - It is specifically aimed at the maxillary sinus and does not involve surgical manipulation of the nasal septum that would lead to a septal perforation. *Turbinate reduction surgery* - **Turbinate reduction** procedures target the inferior turbinates to improve nasal airflow by reducing their size. - These procedures do not involve the nasal septum itself, so a septal perforation would not be a direct or common complication.
Question 5: What is the treatment of choice for ethmoidal polyps?
- A. Functional Endoscopic sinus surgery with polypectomy (Correct Answer)
- B. Intranasal ethmoidectomy
- C. Transantral ethmoidectomy
- D. Extranasal ethmoidectomy
Explanation: ***Functional Endoscopic sinus surgery with polypectomy*** - This is the **gold standard treatment** for ethmoidal polyps, as it allows for **direct visualization** and complete removal of polyps while preserving healthy mucosa. - It also enables restoration of normal sinus ventilation and drainage, which helps prevent recurrence. *Intranasal ethmoidectomy* - This is an **older technique** that is performed blindly and carries a higher risk of complications, such as **orbital or intracranial injury**, compared to endoscopic approaches. - It often results in incomplete polyp removal, leading to a higher rate of recurrence. *Transantral ethmoidectomy* - This approach, also known as the **Caldwell-Luc procedure**, is primarily used for diseases of the **maxillary sinus** and is not the preferred method for isolated ethmoidal polyps. - It is a more invasive external approach with risks including facial swelling, pain, and damage to dental nerves. *Extranasal ethmoidectomy* - This is a more invasive **external approach** involving an incision on the face and is generally reserved for extensive or complicated cases, such as **tumors or severe trauma**, not for routine polyp removal. - It carries risks of visible scarring and longer recovery times, making it less favorable than endoscopic techniques.
Question 6: Onodi cells and Haller cells are associated with which anatomical structures, respectively?
- A. Optic nerve and orbital floor (Correct Answer)
- B. Optic nerve and internal carotid artery
- C. Optic nerve and nasolacrimal duct
- D. Orbital floor and nasolacrimal duct
Explanation: ***Optic nerve and orbital floor*** - An **Onodi cell** is a **sphenoethmoidal air cell** that extends laterally into the sphenoid sinus, closely abutting the **optic nerve** canal and internal carotid artery. - A **Haller cell** (infraorbital ethmoid cell) is an **ethmoid air cell** that extends inferolaterally into the maxillary sinus, thereby impacting the **orbital floor** and infundibulum. *Optic nerve and internal carotid artery* - While **Onodi cells** are indeed closely associated with the **optic nerve**, they can also abut the internal carotid artery, but Haller cells are not primarily associated with this structure. - This option incorrectly pairs Haller cells with the internal carotid artery. *Optic nerve and nasolacrimal duct* - The **optic nerve** is associated with Onodi cells, but the **nasolacrimal duct** is not typically associated with either Onodi cells or Haller cells. - The nasolacrimal duct drains tears into the nasal cavity, an area distinct from the typical locations of these accessory sinuses. *Orbital floor and nasolacrimal duct* - The **orbital floor** is associated with **Haller cells**, but the **nasolacrimal duct** is not the primary anatomical structure of concern regarding either Onodi or Haller cells. - This option misassociates Onodi cells and the nasolacrimal duct, and only partially correctly identifies the Haller cell association.
Question 7: Deep head pain is most commonly associated with which of the following sinus conditions?
- A. Ethmoid sinusitis
- B. Sphenoid sinusitis (Correct Answer)
- C. Maxillary sinusitis
- D. Frontal sinusitis
Explanation: ***Sphenoid sinusitis*** - **Sphenoid sinuses** are located deep within the skull, near the brainstem and pituitary gland - Due to their **deep and central location**, inflammation causes **deep, retro-orbital or vertex head pain** - The pain is often described as being "behind the eyes" or "in the center of the head" - This **deep headache** is characteristically **difficult to localize**, distinguishing it from other sinusitis patterns *Ethmoid sinusitis* - **Ethmoid sinuses** are located between the eyes and the bridge of the nose - Pain is typically experienced **between the eyes** or along the **bridge of the nose** - Headache is usually localized to the **nasal bridge or inner canthus**, not deep head pain *Maxillary sinusitis* - **Maxillary sinuses** are located in the cheekbones - Inflammation causes pain and pressure in the **cheeks**, under the eyes, or **referred pain to the upper teeth** - Most commonly associated with **facial pain**, not deep headache *Frontal sinusitis* - **Frontal sinuses** are located in the forehead - Pain is classic for being localized to the **forehead, above the eyebrows** - While it causes significant headache, it is typically in the **front of the head** - Pain is usually **exacerbated by leaning forward**
Question 8: Carcinoma of maxillary sinus stage III {T3 N0 M0}, Treatment of choice is
- A. Chemotherapy
- B. Chemotherapy and Surgery
- C. Radiotherapy
- D. Surgery and Radiotherapy (Correct Answer)
Explanation: ***Surgery and Radiotherapy*** - For **stage III maxillary sinus carcinoma (T3 N0 M0)**, a **multimodal approach** combining surgical resection with postoperative radiation therapy is generally considered the standard of care for optimal local control and survival outcomes. - **Surgery** aims to achieve clear margins, while **radiotherapy** targets microscopic residual disease and reduces the risk of recurrence. *Chemotherapy* - **Chemotherapy** alone is typically used for **systemic disease** or as a palliative measure, not as a primary curative treatment for localized stage III carcinoma. - Its role in **maxillary sinus cancer** is often reserved for induction therapy in advanced unresectable cases or as part of concurrent chemoradiation. *Chemotherapy and Surgery* - While chemotherapy may be used in combination with surgery for some advanced cancers, it is not the primary adjunctive modality alongside surgery for **stage III maxillary sinus carcinoma**; **radiotherapy** is more commonly indicated. - The primary role of chemotherapy in this context is usually in conjunction with radiation or for distant metastasis. *Radiotherapy* - **Radiotherapy alone** would not be sufficient for a T3 tumor, which involves extensive local invasion (e.g., bone of orbit, anterior ethmoid sinus, pterygoid plates, or cheek skin). - While radiation is crucial, **surgical debulking** or resection is necessary to remove the bulk of the disease and allow the radiation to be more effective.
Question 9: Basal skull view (submentovertical view) X-ray is best to visualize which structures?
- A. Ethmoid sinus
- B. Frontal sinus
- C. Sphenoid sinus (Correct Answer)
- D. Maxillary sinus
Explanation: ***Sphenoid sinus*** - The **basal skull view** (submentovertical or SMV view) directs the X-ray beam from below the chin, through the base of the skull, allowing for an optimal profile of the **sphenoid sinus** and its walls. - This view is particularly useful for assessing conditions like **sphenoid sinusitis** or tumors impacting the sphenoid bone. *Ethmoid sinus* - The **ethmoid sinuses** are best visualized in the **Caldwell view** (posteroanterior) and **Waters view** (occipitomental), which provide better detail of the medial orbital walls and ethmoid air cells. - While the SMV view can show some portions, it lacks the clarity and complete visualization of the ethmoid complex compared to other projections. *Frontal sinus* - The **frontal sinuses** are primarily seen in the **Caldwell view** (posteroanterior) and the **lateral view**, which offer a clear representation of their anterior and posterior walls, as well as their superior-inferior extent. - The SMV view projects the frontal sinuses superiorly, making them difficult to evaluate comprehensively due to superimposed structures. *Maxillary sinus* - The **maxillary sinuses** are most clearly demonstrated in the **Waters view** (occipitomental), which projects the petrous ridges below the maxillary sinuses, providing an unobstructed view of their floors and walls. - The SMV view shows the maxillary sinuses, but their detailed evaluation, especially for fluid levels or mucosal thickening, is better achieved with the Waters view.
Question 10: A boy has developed epistaxis. What is the treatment of choice?
- A. Cauterization of vessels
- B. Surgical ligation
- C. Digital pressure (Correct Answer)
- D. Nasal packing
Explanation: ***Digital pressure*** - This is the **initial and most common first-line treatment** for acute epistaxis, especially in children, as most nosebleeds originate from Kiesselbach's plexus in the anterior septum. - Applying firm, continuous pressure to the soft part of the nose for 10-15 minutes can effectively compress the bleeding vessels and promote clot formation. *Cauterization of vessels* - This method is used when **digital pressure fails** to control the bleeding and the bleeding site can be identified, often in the anterior septum. - It involves using chemical (e.g., silver nitrate) or electrical methods to seal the bleeding vessel. *Surgical ligation* - **Surgical ligation** is reserved for severe, posterior epistaxis that is refractory to other methods like nasal packing or embolization. - It involves surgically tying off the major arteries supplying the nose (e.g., internal maxillary, external carotid) and carries greater risks. *Nasal packing* - **Nasal packing** is typically used when direct pressure has failed, and the bleeding site is not easily amenable to cauterization, or in cases of posterior epistaxis. - It involves inserting material into the nasal cavity to apply direct pressure to the bleeding vessel, but it is more invasive and uncomfortable than digital pressure.
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