Free ABO Oculoplastic & Orbit Questions and Answers — Questions and Answers
Question 1: Which of the following is the most common benign orbital tumor in adults?
- Capillary hemangioma
- Dermoid cyst
- Cavernous hemangioma (Correct answer)
- Lymphangioma
Correct answer: Cavernous hemangioma
The cavernous hemangioma is recognized as the most common benign orbital tumor in adults. This slow-growing vascular lesion typically presents with gradual, painless proptosis (bulging of the eye) and can cause visual disturbances if it compresses the optic nerve. Its characteristic appearance on imaging helps differentiate it from other orbital masses.
Question 2: Which cranial nerve is commonly affected in a blowout fracture of the orbit?
- Olfactory nerve
- Infraorbital nerve (Correct answer)
- Optic nerve
- Trochlear nerve
Correct answer: Infraorbital nerve
A blowout fracture of the orbit typically involves the floor or medial wall, which are thin and prone to fracture from blunt trauma. The infraorbital nerve, a branch of the trigeminal nerve (CN V), runs through the orbital floor. Damage to this nerve during a blowout fracture commonly results in numbness or altered sensation in the cheek, upper lip, and upper teeth on the affected side.
Question 3: What is the most appropriate management for a chalazion?
- Topical antiviral therapy
- Enucleation
- Warm compresses (Correct answer)
- Cryotherapy
Correct answer: Warm compresses
A chalazion is a chronic, sterile lipogranulomatous inflammation of a meibomian gland, often presenting as a painless lump on the eyelid. The most appropriate initial management involves applying warm compresses multiple times a day. This helps to soften the hardened secretions, promote drainage of the blocked gland, and reduce inflammation, often leading to resolution without further intervention.
Question 4: Which condition presents with sudden, painful proptosis and ophthalmoplegia?
- Preseptal cellulitis
- Orbital cellulitis (Correct answer)
- Graves orbitopathy
- Orbital tumor
Correct answer: Orbital cellulitis
Orbital cellulitis is a severe infection of the tissues behind the orbital septum. It presents with sudden, painful proptosis (forward displacement of the eyeball) and ophthalmoplegia (paralysis or weakness of eye muscles) due to inflammation and swelling within the confined orbital space. This condition is an ophthalmologic emergency requiring prompt diagnosis and treatment to prevent vision loss and intracranial spread.
Question 5: What is the primary cause of ectropion in elderly patients?
- Trauma
- Cicatricial scarring
- Paralysis
- Involutional changes (Correct answer)
Correct answer: Involutional changes
Involutional ectropion, common in elderly patients, is primarily caused by age-related weakening and laxity of the lower eyelid tissues. This includes horizontal laxity of the tarsal plate and canthal tendons, as well as weakening of the orbicularis oculi muscle. These changes lead to the outward turning of the eyelid margin, exposing the conjunctiva.
Question 6: Which tumor is most commonly associated with painless proptosis in children?
- Lymphoma
- Rhabdomyosarcoma (Correct answer)
- Capillary hemangioma
- Neuroblastoma
Correct answer: Rhabdomyosarcoma
Rhabdomyosarcoma is the most common primary malignant orbital tumor in children, typically presenting with rapidly progressive, painless proptosis. It originates from undifferentiated mesenchymal cells and can cause significant displacement of the globe. Early diagnosis and aggressive treatment are crucial due to its rapid growth and potential for metastasis.
Free ABO Oculoplastic & Orbit Questions and Answers
Which of the following is the most common benign orbital tumor in adults?