Orbital Tumors — MCQs

10 questions

A young girl with a previous history of repeated pain over the medial canthus and chronic use of decongestants now presents with intense chills, rigors, and diplopia on lateral gaze. Examination shows an optic disc that is congested. The most likely diagnosis would be:

Which of the following conditions is least likely to cause proptosis?

Which of the following is the most common cause of a mixed cystic and solid suprasellar mass seen on cranial MR scan of a 10-year-old child:

Which of the following is the most common false localizing neurological sign in assessing brain tumors-

A 2-year-old child presents with unilateral leukocoria and poor vision. What is the most likely diagnosis?

The patient presents with unilateral proptosis and bilateral abducent nerve palsy. What is the most likely cause?

Most common optic nerve tumor in children causing blindness:

The most common benign tumour of the orbit is

All are causes of proptosis except:

Q10

Which of the following statements about optic nerve glioma is false?

Orbital Tumors Indian Medical PG Practice Questions and MCQs

Question 1: A young girl with a previous history of repeated pain over the medial canthus and chronic use of decongestants now presents with intense chills, rigors, and diplopia on lateral gaze. Examination shows an optic disc that is congested. The most likely diagnosis would be:

A. Orbital Apex Syndrome
B. Orbital Cellulitis
C. Ethmoidal Sinusitis
D. Cavernous Sinus Thrombosis (Correct Answer)

Explanation: ***Cavernous Sinus Thrombosis*** - The combination of **chills**, **rigors**, **diplopia on lateral gaze** (due to abducens nerve palsy), and a **congested optic disc** points strongly to cavernous sinus thrombosis [1]. - A history of recurrent **medial canthus pain** and **decongestant use** suggests underlying sinusitis, which is a common predisposing factor for this thrombotic event [1]. Rigors specifically represent a rapid rise in body temperature often associated with bacterial infection [2]. *Ethmoidal Sinusitis* - While ethmoidal sinusitis can spread to the orbit, it typically presents with **localized pain**, **tenderness**, and **periorbital swelling**, rather than systemic symptoms like chills, rigors, and diplopia indicating cranial nerve involvement. - A **congested optic disc** is more indicative of increased intracranial pressure or orbital congestion, which is a more severe complication than isolated ethmoidal sinusitis [3]. *Orbital Cellulitis* - **Orbital cellulitis** presents with **proptosis**, **ophthalmoplegia**, **eyelid swelling**, and **erythema**, often with fever. While it can cause diplopia, the intense systemic symptoms (rigors) and a congested optic disc are more suggestive of an intracranial rather than purely orbital process. - It does not typically cause the prominent abducens nerve palsy or the systemic severity seen in cavernous sinus thrombosis without direct spread. *Orbital Apex Syndrome* - **Orbital apex syndrome** involves cranial nerves II, III, IV, V1, and VI, leading to **vision loss**, **ophthalmoplegia**, and **facial numbness**. While it includes diplopia and can affect the optic nerve (leading to congestion), the intense systemic symptoms of **chills** and **rigors** (suggesting widespread infection/sepsis) are less characteristic of orbital apex syndrome itself and more indicative of a direct thrombotic or septic process like cavernous sinus thrombosis.

Question 2: Which of the following conditions is least likely to cause proptosis?

A. Sarcoidosis
B. Myxoedema (Correct Answer)
C. Grave's disease
D. Pituitary adenoma

Explanation: ***Myxoedema*** - **Myxoedema** is associated with severe **hypothyroidism** and is characterized by non-pitting edema due to the accumulation of **glycosaminoglycans** in tissues. - While it can cause facial puffiness, it is **least likely** to cause **proptosis** as there is no direct mechanism for an increase in orbital contents to push the eye forward. *Grave's disease* - **Grave's disease** is the most common cause of **proptosis** due to **immune-mediated inflammation** and accumulation of **glycosaminoglycans** and fat in the orbital tissues, leading to expansion. - This condition specifically affects the **extraocular muscles** and fat, causing bulging of the eyes. *Sarcoidosis* - **Orbital sarcoidosis** can cause **proptosis** due to the formation of **granulomas** within the orbit, leading to mass effect and inflammation. - It can affect any part of the eye and orbit, leading to varied clinical presentations including axial or non-axial globe displacement. *Pituitary adenoma* - A **pituitary adenoma** itself does not directly cause proptosis as it is located in the **sella turcica**, posterior to the orbits. - However, **large adenomas** can cause proptosis indirectly if they invade the **cavernous sinus** and obstruct venous return from the orbit, or if they are associated with **acromegaly**, which can lead to bony overgrowth of the orbital structures and surrounding tissues.

Question 3: Which of the following is the most common cause of a mixed cystic and solid suprasellar mass seen on cranial MR scan of a 10-year-old child:

A. Optic chiasma glioma
B. Pituitary Adenoma
C. Craniopharyngioma (Correct Answer)
D. Germinoma

Explanation: ***Craniopharyngioma*** * **Craniopharyngiomas** are the most common cause of a mixed cystic and solid suprasellar mass in children, often presenting with calcifications. * These tumors typically arise from Rathke's pouch remnants and can cause symptoms related to **pituitary dysfunction** and **visual field defects**. *Optic chiasma glioma* * **Optic chiasma gliomas** usually present as solid masses, although they can sometimes have cystic components. * They are more commonly associated with **Neurofibromatosis type 1** and primarily cause visual symptoms. *Pituitary Adenoma* * **Pituitary adenomas** are rare in children and typically present as purely solid masses, although cystic degeneration can occur. * They are more common in adults and often cause symptoms of **hormonal overproduction** or hypopituitarism. *Germinoma* * **Germinomas** are usually solid and homogenously enhancing tumors, sometimes with small cystic areas. * They are frequently located in the **pineal region** or suprasellar region and can cause hydrocephalus or endocrine dysfunction.

Question 4: Which of the following is the most common false localizing neurological sign in assessing brain tumors-

A. Seizures
B. Diplopia (due to sixth nerve palsy) (Correct Answer)
C. Unilateral papilloedema
D. Abnormal unilateral pupil

Explanation: ***Diplopia (due to sixth nerve palsy)*** - **Diplopia** resulting from **sixth nerve (abducens) palsy** is the most common false localizing sign in patients with brain tumors, often due to elevated intracranial pressure [1]. - The sixth cranial nerve has a **long intracranial course**, making it particularly susceptible to compression or stretching from generalized intracranial hypertension, regardless of the tumor's specific location [1]. *Seizures* - Seizures are a common symptom of brain tumors, but they are typically **localizing or lateralizing**, pointing towards the region of cortical irritation [1]. - While a seizure can be the initial presentation, it doesn't usually cause a false localization of the primary tumor site, but rather reflects the tumor's irritative effect on the brain region. *Abnormal unilateral pupil* - An abnormal unilateral pupil, such as a dilated pupil, is usually a **true localizing sign** indicating compression of the **oculomotor nerve (CN III)** due to uncal herniation, a specific and grave sign of mass effect [1]. - This symptom strongly suggests a lesion in the ipsilateral temporal lobe compressing the CN III, rather than general raised intracranial pressure. *Unilateral papilloedema* - **Papilloedema** is typically a **bilateral sign** of raised intracranial pressure, as both optic nerves are affected by increased CSF pressure. - While asymmetric or rarely unilateral papilloedema can occur, the classic presentation of a brain tumor with raised ICP is bilateral, making unilateral presentation a less common false localizing sign compared to sixth nerve palsy.

Question 5: A 2-year-old child presents with unilateral leukocoria and poor vision. What is the most likely diagnosis?

A. Congenital cataract
B. Retinoblastoma (Correct Answer)
C. Endophthalmitis
D. Coats disease

Explanation: ***Retinoblastoma*** - **Leukocoria** (white pupillary reflex) is the **most common presenting sign** of retinoblastoma, occurring in approximately 60% of cases - The combination of **unilateral leukocoria** and **poor vision** in a **2-year-old child** (peak age 18-24 months) is highly suggestive - It is a **rapidly growing malignant intraocular tumor** arising from the neural retina, requiring urgent evaluation and treatment - Other presenting features may include **strabismus**, **red eye**, and in advanced cases, **proptosis** *Congenital cataract* - Can also present with **leukocoria** due to opacification of the lens - However, congenital cataracts are typically **bilateral** (75% of cases) and diagnosed earlier in infancy - The **static, non-progressive nature** distinguishes it from the rapidly growing retinoblastoma - Family history and associated systemic conditions (TORCH infections, metabolic disorders) are common *Endophthalmitis* - Severe **intraocular infection** affecting vitreous and aqueous humor - Typically presents with **acute pain**, **severe redness**, **hypopyon**, and **rapid vision loss** - Usually follows **penetrating trauma** or **intraocular surgery**, which would be uncommon in a 2-year-old - **Leukocoria without acute inflammatory signs** makes this diagnosis unlikely *Coats disease* - Characterized by **abnormal telangiectatic retinal vessels** with **exudative retinal detachment** and **yellow subretinal exudates** - Can present with leukocoria (yellow reflex due to lipid deposits) in young children - However, it typically affects **older children** (mean age 5-8 years), is predominantly **unilateral**, and has a **more indolent course** - More common in **males** and usually lacks the rapid progression of retinoblastoma

Question 6: The patient presents with unilateral proptosis and bilateral abducent nerve palsy. What is the most likely cause?

A. Cavernous sinus pathology (Correct Answer)
B. Orbital cellulitis
C. Orbital pseudotumor
D. Orbital lymphoma

Explanation: The patient presents with unilateral proptosis and bilateral abducent nerve palsy. What is the most likely cause? ***Cavernous sinus pathology*** - **Unilateral proptosis** combined with **bilateral abducens nerve palsy** is a classic presentation consistent with cavernous sinus involvement, as the abducens nerves (CN VI) pass through both cavernous sinuses and are vulnerable to pathology there. [1] - The cavernous sinus contains multiple cranial nerves (**III, IV, V1, V2, VI**) and the internal carotid artery, making it a critical anatomical location where lesions can cause complex neurological deficits affecting orbital structures and eye movements. [1] *Orbital cellulitis* - Typically presents with **unilateral proptosis**, pain, eyelid swelling, and fever, often following a sinus infection. - It primarily affects the **orbital contents anterior to the orbital septum** and would not explain bilateral abducens nerve palsy. *Orbital pseudotumor* - Characterized by **unilateral proptosis**, pain, and diplopia due to idiopathic inflammation of orbital tissues. - While it can cause ophthalmoplegia, **bilateral abducens nerve palsy** is not a typical presentation for a condition usually confined to one orbit. *Orbital lymphoma* - Presents with **painless, slowly progressive unilateral proptosis** or an orbital mass. - While it can cause compressive symptoms, **bilateral abducens nerve palsy** is an atypical presentation as the disease usually remains confined to a single orbit.

Question 7: Most common optic nerve tumor in children causing blindness:

A. Astrocytoma
B. Craniopharyngioma
C. Meningioma
D. Glioma (Correct Answer)

Explanation: ***Glioma*** - **Optic pathway gliomas** (also called optic nerve gliomas) are the **most common primary tumors of the optic nerve in children**, accounting for approximately 66% of all optic nerve tumors in the pediatric population. - These are typically **low-grade pilocytic astrocytomas (WHO Grade I)** and are strongly associated with **neurofibromatosis type 1 (NF1)** in 15-30% of cases [1]. - They cause **progressive visual loss** leading to **blindness**, and may present with **proptosis**, strabismus, and optic disc swelling. - The term "glioma" is the **standard clinical nomenclature** used for these tumors in pediatric ophthalmology and neuro-oncology. *Astrocytoma* - While optic nerve gliomas are histologically **pilocytic astrocytomas** [1], the accepted clinical term for this entity is **"optic nerve glioma"** or **"optic pathway glioma"**, not simply "astrocytoma." - Using "astrocytoma" alone is too generic and could refer to various brain astrocytomas (diffuse, anaplastic, glioblastoma) rather than the specific entity of optic nerve tumors [1]. - In clinical practice and literature, these are consistently referred to as **optic gliomas**. *Craniopharyngioma* - This is a **suprasellar tumor** arising from Rathke's pouch remnants, causing **bitemporal hemianopsia** due to **chiasmal compression**. - It does **not originate from the optic nerve** itself—it compresses the optic chiasm from above. - While common in children, it is a chiasmal/suprasellar lesion, not an optic nerve tumor. *Meningioma* - **Optic nerve sheath meningiomas** are rare in children and primarily affect **adults (peak in 40s)**, especially women. - These arise from meningothelial cells of the optic nerve sheath and cause **progressive painless visual loss** and **optic disc edema**. - In children, meningiomas represent **<2% of CNS tumors**, making them an uncommon cause of pediatric optic nerve pathology. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 724-726.

Question 8: The most common benign tumour of the orbit is

A. Optic nerve glioma
B. Meningioma
C. Benign-mixed tumour
D. Haemangioma (Correct Answer)

Explanation: ***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**.

Question 9: All are causes of proptosis except:

A. Orbital cellulitis
B. Orbital tumor
C. Retinal detachment (Correct Answer)
D. Graves' disease

Explanation: ***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.

Question 10: Which of the following statements about optic nerve glioma is false?

A. Can cause bilateral proptosis
B. Most common primary orbital tumour among children (Correct Answer)
C. Is associated with neurofibromatosis type 1
D. Typically presents with unilateral axial proptosis

Explanation: ***Most common primary orbital tumour among children*** - This statement is **FALSE** - optic nerve glioma is the most common **optic nerve tumor** in children, but NOT the most common **primary orbital tumor**. - **Capillary hemangioma** is the most common primary orbital tumor in the pediatric age group. - This is an important distinction: optic nerve gliomas account for 1-6% of all orbital tumors in children. *Can cause bilateral proptosis* - This is TRUE - optic nerve gliomas can cause bilateral proptosis, particularly in patients with **neurofibromatosis type 1 (NF1)**. - Bilateral involvement occurs in **10-15% of cases**, especially when there is chiasmal involvement extending to both optic nerves. - While unilateral presentation is more common, bilateral disease is well-recognized. *Is associated with neurofibromatosis type 1* - This is TRUE - **15-20% of patients with NF1** develop optic pathway gliomas during childhood. - Conversely, **25-50% of children with optic nerve gliomas** have underlying NF1. - This strong association makes NF1 screening essential in children diagnosed with optic nerve gliomas. *Typically presents with unilateral axial proptosis* - This is TRUE - the classic presentation is **slowly progressive unilateral axial proptosis**. - The tumor grows within the optic nerve sheath, pushing the eye forward in an axial direction. - Associated findings include visual loss, optic disc swelling, and optociliary shunt vessels.

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