Orbital Diseases Practice Questions

Q: The most common benign tumour of the orbit is

Haemangioma. ***Haemangioma*** - **Cavernous haemangiomas** are the most frequently encountered benign tumors of the orbit in adults. - They are typically well-circumscribed, slow-growing vascular malformations that can cause **proptosis** and visual disturbances. *Optic nerve glioma* - While optic nerve gliomas are a benign tumor, they are less common than cavernous haemangiomas in the general orbital pathology. - These tumors specifically arise from the **optic nerve** and are more prevalent in children with **neurofibromatosis type 1 (NF1)**. *Meningioma* - **Orbital meningiomas** originate from the meninges surrounding the optic nerve or within the cranial cavity, extending into the orbit. - They are considered less common than haemangiomas and often present with a slower progression of symptoms like **proptosis** and **vision loss**. *Benign-mixed tumour* - This term usually refers to a **pleomorphic adenoma of the lacrimal gland**, which is the most common epithelial tumor of the lacrimal gland, but not the overall most common benign orbital tumor. - While benign, these tumors have a potential for malignant transformation and present with distinct symptoms related to the **lacrimal gland**.

Q: A patient presents to the emergency department after sustaining blunt trauma to the left eye. Clinical examination reveals enophthalmos, diplopia on upward gaze, and periorbital ecchymosis. The CT scan image is shown below. What is your diagnosis?

Orbital blow out fracture. ***Orbital blow out fracture*** - This type of fracture commonly results from direct blunt trauma to the eye, causing increased intraorbital pressure and subsequent fracture of the **thinnest orbital walls**, typically the floor or medial wall - Clinical signs often include **enophthalmos** (sunken eye), **diplopia** (especially on upward gaze due to inferior rectus muscle entrapment), **periorbital ecchymosis**, and sometimes **numbness** in the distribution of the infraorbital nerve - CT imaging typically shows a fracture of the orbital floor with herniation of orbital contents into the maxillary sinus (teardrop sign) *Oculomotor nerve paralysis* - Paralysis of the oculomotor nerve (CN III) would lead to characteristic findings such as **ptosis**, **dilated pupil**, and the eye positioned **down and out** - While it can be caused by trauma, it does not typically present with radiographic evidence of a fracture or entrapment of orbital contents *Retrobulbar hemorrhage* - A retrobulbar hemorrhage involves bleeding behind the eyeball, causing a rapid increase in **intraorbital pressure** - This typically presents with **proptosis** (forward displacement of the eye), **pain**, and decreased vision, which can be an ophthalmic emergency, but not primarily characterized by a bony fracture *Orbital roof fracture* - Fractures of the orbital roof are less common than blow-out fractures and often result from **direct trauma to the forehead** - They can be associated with **intracranial injuries** and may present with cerebrospinal fluid leakage and **pneumocephalus**, which are not the primary features described in a typical blow-out injury

Q: What is the diagnosis for a patient with unilateral proptosis with bilateral 6th nerve palsy with chemosis and euthyroid status?

Cavernous sinus thrombosis. ***Cavernous sinus thrombosis*** - The combination of **unilateral proptosis**, **bilateral 6th nerve palsy**, and **chemosis** strongly suggests cavernous sinus thrombosis. - The cavernous sinus contains cranial nerves III, IV, V1, V2, and VI; thrombosis can lead to dysfunction of these nerves, particularly the **abducens nerve (VI)**, and venous congestion causing proptosis and chemosis. *Retinoblastoma* - Typically presents in **children** with **leukocoria**, strabismus, and sometimes proptosis. - It is a primary intraocular tumor and does not usually cause acute bilateral cranial nerve palsies and chemosis. *Thyroid ophthalmopathy* - Characterized by proptosis, lid retraction, and ophthalmoplegia, often with chemosis and conjunctival injection, but usually in the context of thyroid dysfunction (hyperthyroidism). - While it can cause proptosis, the presence of **bilateral 6th nerve palsy** and a **euthyroid** status makes cavernous sinus thrombosis more likely, as thyroid ophthalmopathy typically presents with restrictive ophthalmoplegia rather than isolated cranial nerve palsies. *Orbital pseudotumour* - Presents with painful proptosis, chemosis, and ophthalmoplegia, which can be unilateral or bilateral. - Differentiating features include a good response to **steroids** and usually **no associated cranial nerve palsies** in the pattern described.

Q: The most common cause of proptosis in adults:-

Thyroid eye disease. ***Thyroid eye disease*** - **Thyroid eye disease (TED)**, also known as Graves' ophthalmopathy, is the most common cause of **proptosis** in adults. - It results from an autoimmune process leading to inflammation and expansion of the **extraocular muscles** and orbital fat, which pushes the eyeball forward. *Preseptal cellulitis* - **Preseptal cellulitis** is an infection of the eyelid and periorbital tissue anterior to the orbital septum, typically presenting with **eyelid swelling** and redness. - While it causes periorbital swelling, it generally does not cause true **proptosis**, which is the anterior displacement of the eyeball itself. *Capillary hemangioma* - **Capillary hemangiomas** are benign vascular tumors and are the most common orbital tumor in **infancy and childhood**, not adults. - They typically cause proptosis in young children, often presenting as a **reddish-blue mass** that may increase in size with crying. *Orbital cellulitis* - **Orbital cellulitis** is a serious infection of the tissues within the orbit, posterior to the orbital septum, which can cause **proptosis**, pain, and ophthalmoplegia. - While it is a cause of proptosis, it is an **acute infectious process** and not the most common overall cause of proptosis in the adult population compared to thyroid eye disease.

Q: All are causes of proptosis except:

Retinal detachment. ***Retinal detachment*** - **Retinal detachment** is a condition where the retina separates from the underlying supportive tissue and does not cause proptosis. - Its primary symptoms include **flashes of light**, **floaters**, and a **curtain-like shadow** in the visual field. *Orbital cellulitis* - **Orbital cellulitis** is an infection of the fat and muscles around the eye, leading to inflammation and swelling. - This swelling can push the eye forward, causing **proptosis**. *Orbital tumor* - An **orbital tumor** is a mass growing within the orbit (eye socket), which occupies space and displaces the eyeball. - This displacement typically results in **proptosis**, often unilateral and progressive. *Graves' disease* - **Graves' disease** (or Graves' ophthalmopathy) involves inflammation and swelling of the extraocular muscles and orbital fat due to autoimmune processes. - This increased volume within the orbit directly causes **proptosis** and is often bilateral.

Q: A 30-year-old female presents with proptosis, pain, and vision loss in one eye. An MRI reveals an orbital mass. What is the most likely diagnosis?

Orbital pseudotumor. ***Orbital pseudotumor*** - Orbital pseudotumor, also known as **idiopathic orbital inflammation**, often presents with **unilateral proptosis**, vision loss, and pain due to inflammatory masses in the orbit, as described. - Diagnosis often involves excluding other conditions like infection or malignancy, and an MRI can reveal a **diffuse or localized orbital mass**, mimicking other orbital lesions. *Orbital cellulitis* - This condition typically presents with signs of **acute infection**, such as erythema, warmth, severe pain, fever, and leukocytosis, which are not mentioned here. - While it can cause proptosis, the presence of an **"orbital mass"** on MRI, rather than diffuse inflammation or abscess, makes pseudotumor a more likely diagnosis. *Graves' ophthalmopathy* - Graves' ophthalmopathy usually involves **bilateral proptosis**, although it can be asymmetric, and is often associated with other signs of Graves' disease like hyperthyroidism, lid lag, and retraction. - The MRI in Graves' ophthalmopathy typically shows **enlargement of the extraocular muscles**, particularly the recti, rather than a distinct orbital mass. *Optic glioma* - Optic gliomas are **tumors of the optic nerve**, most commonly seen in children and associated with neurofibromatosis type 1. - While they can cause proptosis and vision loss, an MRI would specifically show a **fusiform enlargement of the optic nerve**, not a general "orbital mass," and it's less common in a 30-year-old without other predisposing factors.

Q: A 5-year-old child presents with painless, progressive proptosis of the right eye. MRI reveals a mass in the right orbit. Which structure is most likely involved?

Extraocular muscles. ***Extraocular muscles*** - **Rhabdomyosarcoma**, a common orbital tumor in children, often arises from the **extraocular muscles** and presents with rapidly progressive, painless proptosis. - The location within the orbit and the clinical presentation in a child are highly suggestive of a tumor originating from these muscles. *Lacrimal gland* - **Lacrimal gland tumors** are rare in children and typically present as masses in the superotemporal orbit, potentially causing globe displacement rather than central proptosis. - More common in adults; specific tumors like pleomorphic adenoma or adenoid cystic carcinoma are seen. *Optic nerve* - **Optic nerve gliomas** are a possibility in children but usually cause **vision loss** and optic disc edema, which are not mentioned in this presentation. - They also tend to cause axial proptosis with optic nerve enlargement visible on imaging. *Orbital fat* - While the orbit contains fat, primary tumors arising from **orbital fat** itself are exceedingly rare. - Masses within the orbital fat are more likely to be extensions of other structures or inflammatory conditions.

Q: The globe is displaced to which side in lacrimal gland tumour?

Inferonasal. ***Inferonasal*** - A lacrimal gland tumor is located in the **superotemporal** aspect of the orbit. - Due to its superior and temporal position, the tumor will displace the globe **inferiorly** and **nasally**. *Inferotemporal* - This displacement pattern would suggest an orbital mass originating from the **nasal** and **superior** quadrants (e.g., ethmoid sinus mucoceles extending superiorly and laterally), pushing the globe inferotemporally. - Lacrimal gland tumors are situated superotemporally, thus pushing the globe in the opposite direction. *Superotemporal* - This displacement would occur if a mass were located in the **inferonasal** quadrant of the orbit, which is not the typical location of a lacrimal gland tumor. - Lacrimal gland tumors originate from the superotemporal aspect, so they cannot displace the globe into their own position. *Nasal* - Pure nasal displacement is unlikely for a lacrimal gland tumor, as it is located **superotemporally**. - A mass located in the **lateral compartment** of the orbit would be more likely to cause nasal displacement.

Q: Enophthalmos is seen in ?

Blow-out fracture of orbit wall. ***Blow-out fracture of orbit wall*** - A **blow-out fracture** typically involves the **orbital floor** or **medial wall**, expanding the orbital volume. - This increase in orbital volume allows the eyeball to drop back into the orbit, causing **enophthalmos**. *Hyperthyroidism* - Hyperthyroidism, particularly **Graves' ophthalmopathy**, is associated with **exophthalmos** (protrusion of the eyeballs), not enophthalmos. - This is due to inflammation and edema of the **retro-orbital tissues** and extraocular muscles. *Radiation Injuries* - While radiation to the orbital region can cause various ocular complications, **enophthalmos** is not a common direct sequela. - Such injuries might lead to tissue scarring, but orbital volume changes leading to enophthalmos are atypical. *Diabetes mellitus* - Diabetes mellitus can lead to various ocular complications like **diabetic retinopathy** and **cataracts**, but not typically enophthalmos. - There is no direct mechanism by which diabetes would cause the eyeball to recede into the orbit.

Question 1

Which of the following statements about thyroid eye disease is false?

Accepted Answer

The management corresponds to improvement in thyrotoxic state

Answer

NOSPECS score is used to classify thyroid eye disease

Answer

Can lead to visual loss

Answer

Seen in more than 10% of patients with hyperthyroidism

Question 2

The most common benign tumour of the orbit is

Accepted Answer

Haemangioma

Answer

Optic nerve glioma

Answer

Meningioma

Answer

Benign-mixed tumour

Question 3

A patient presents to the emergency department after sustaining blunt trauma to the left eye. Clinical examination reveals enophthalmos, diplopia on upward gaze, and periorbital ecchymosis. The CT scan image is shown below. What is your diagnosis?

Accepted Answer

Orbital blow out fracture

Answer

Oculomotor nerve paralysis

Answer

Retrobulbar hemorrhage

Answer

Orbital roof fracture

Question 4

What is the diagnosis for a patient with unilateral proptosis with bilateral 6th nerve palsy with chemosis and euthyroid status?

Accepted Answer

Cavernous sinus thrombosis

Answer

Retinoblastoma

Answer

Thyroid ophthalmopathy

Answer

Orbital pseudotumour

Question 5

The most common cause of proptosis in adults:-

Accepted Answer

Thyroid eye disease

Answer

Preseptal cellulitis

Answer

Capillary hemangioma

Answer

Orbital cellulitis

Question 6

All are causes of proptosis except:

Accepted Answer

Retinal detachment

Answer

Orbital cellulitis

Answer

Orbital tumor

Answer

Graves' disease

Question 7

A 30-year-old female presents with proptosis, pain, and vision loss in one eye. An MRI reveals an orbital mass. What is the most likely diagnosis?

Accepted Answer

Orbital pseudotumor

Answer

Orbital cellulitis

Answer

Graves' ophthalmopathy

Answer

Optic glioma

Question 8

A 5-year-old child presents with painless, progressive proptosis of the right eye. MRI reveals a mass in the right orbit. Which structure is most likely involved?

Accepted Answer

Extraocular muscles

Answer

Optic nerve

Answer

Orbital fat

Answer

Lacrimal gland

Question 9

The globe is displaced to which side in lacrimal gland tumour?

Accepted Answer

Inferonasal

Answer

Inferotemporal

Answer

Nasal

Answer

Superotemporal

Question 10

Enophthalmos is seen in ?

Accepted Answer

Blow-out fracture of orbit wall

Answer

Hyperthyroidism

Answer

Radiation Injuries

Answer

Diabetes mellitus

Orbital Diseases — MCQs

Orbital Diseases — MCQs

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