- Published on
Ophthalmology – Enophthalmos
Enophthalmos refers to the posterior displacement of a normal-sized globe within the orbit, giving the appearance of a “sunken eye.” It can be congenital or acquired, with acquired causes being more common in clinical practice. The condition may develop gradually or suddenly, depending on the underlying etiology, and can be unilateral or bilateral.
The underlying pathophysiology depends on the cause. Congenital enophthalmos results from abnormal orbital development during fetal life. Acquired forms arise from mechanisms such as loss of orbital volume (fat atrophy), structural changes in the orbit (e.g., fractures or sinus disease), or fibrotic traction pulling the globe backward. Enlargement of the orbital cavity or loss of support from the orbital floor may also lead to associated hypoglobus (downward displacement of the globe).
Etiologically, enophthalmos can be grouped into three major categories: structural abnormalities, fat atrophy, and tractional causes. Common causes include orbital floor fractures, especially following trauma, postsurgical changes (such as orbital decompression or tumor removal), and silent sinus syndrome, where chronic maxillary sinus collapse leads to orbital floor descent. Other causes include orbital fat atrophy (e.g., due to radiation or systemic wasting), metastatic scirrhous carcinoma (notably breast cancer) causing fibrotic contraction, and orbital venous malformations. Neurologic and congenital conditions such as Duane retraction syndrome may also be associated.
Patients often report a gradual sinking of the eye or asymmetry in appearance. Some may notice a droopy eyelid or deepened upper eyelid sulcus, and historical photographs can be useful for comparison. On examination, key findings include deepened superior sulcus, narrowed palpebral fissure, and posterior displacement of the globe. Measurement with Hertel exophthalmometry can help quantify asymmetry, although it may be less useful in bilateral cases. Additional findings such as skin thinning (in atrophy) or thickening (in malignancy), as well as ocular motility or sensory deficits, may provide clues to the underlying cause. A full ocular exam is essential to assess visual acuity and optic nerve function, including evaluation for an afferent pupillary defect.
Imaging plays a crucial role in diagnosis. A CT scan of the orbits (axial and coronal views) is the primary modality to evaluate bony structures and orbital volume changes. If inflammatory or neoplastic causes are suspected, an MRI with contrast and fat suppression is indicated. In uncertain cases, orbital biopsy (orbitotomy) may be required for definitive diagnosis.
The differential diagnosis includes pseudo-enophthalmos, where the globe appears sunken but is actually normal in position. Causes include contralateral proptosis, Horner syndrome, phthisis bulbi, and microphthalmos.
Management depends on the underlying etiology. Orbital fractures may require surgical repair to restore orbital volume. Silent sinus syndrome is treated with functional endoscopic sinus surgery to re-aerate the sinus. In cases of volume loss, orbital augmentation with implants or fillers (e.g., hyaluronic acid) may be used. Oncologic causes require appropriate systemic evaluation and treatment.
Follow-up involves monitoring by an ophthalmologist, and in cases involving sinus disease, collaboration with an otolaryngologist is important. Patients should be advised to avoid nose blowing or forceful sneezing (with a closed mouth), particularly if an orbital fracture is suspected.
Chronic enophthalmos can be difficult to fully correct, especially if longstanding, and may lead to persistent cosmetic and functional concerns if not addressed early.
Enophthalmos refers to the posterior displacement of a normal-sized globe within the orbit, giving the appearance of a “sunken eye.” It can be congenital or acquired, with acquired causes being more common in clinical practice. The condition may develop gradually or suddenly, depending on the underlying etiology, and can be unilateral or bilateral.
The underlying pathophysiology depends on the cause. Congenital enophthalmos results from abnormal orbital development during fetal life. Acquired forms arise from mechanisms such as loss of orbital volume (fat atrophy), structural changes in the orbit (e.g., fractures or sinus disease), or fibrotic traction pulling the globe backward. Enlargement of the orbital cavity or loss of support from the orbital floor may also lead to associated hypoglobus (downward displacement of the globe).
Etiologically, enophthalmos can be grouped into three major categories: structural abnormalities, fat atrophy, and tractional causes. Common causes include orbital floor fractures, especially following trauma, postsurgical changes (such as orbital decompression or tumor removal), and silent sinus syndrome, where chronic maxillary sinus collapse leads to orbital floor descent. Other causes include orbital fat atrophy (e.g., due to radiation or systemic wasting), metastatic scirrhous carcinoma (notably breast cancer) causing fibrotic contraction, and orbital venous malformations. Neurologic and congenital conditions such as Duane retraction syndrome may also be associated.
Patients often report a gradual sinking of the eye or asymmetry in appearance. Some may notice a droopy eyelid or deepened upper eyelid sulcus, and historical photographs can be useful for comparison. On examination, key findings include deepened superior sulcus, narrowed palpebral fissure, and posterior displacement of the globe. Measurement with Hertel exophthalmometry can help quantify asymmetry, although it may be less useful in bilateral cases. Additional findings such as skin thinning (in atrophy) or thickening (in malignancy), as well as ocular motility or sensory deficits, may provide clues to the underlying cause. A full ocular exam is essential to assess visual acuity and optic nerve function, including evaluation for an afferent pupillary defect.
Imaging plays a crucial role in diagnosis. A CT scan of the orbits (axial and coronal views) is the primary modality to evaluate bony structures and orbital volume changes. If inflammatory or neoplastic causes are suspected, an MRI with contrast and fat suppression is indicated. In uncertain cases, orbital biopsy (orbitotomy) may be required for definitive diagnosis.
The differential diagnosis includes pseudo-enophthalmos, where the globe appears sunken but is actually normal in position. Causes include contralateral proptosis, Horner syndrome, phthisis bulbi, and microphthalmos.
Management depends on the underlying etiology. Orbital fractures may require surgical repair to restore orbital volume. Silent sinus syndrome is treated with functional endoscopic sinus surgery to re-aerate the sinus. In cases of volume loss, orbital augmentation with implants or fillers (e.g., hyaluronic acid) may be used. Oncologic causes require appropriate systemic evaluation and treatment.
Follow-up involves monitoring by an ophthalmologist, and in cases involving sinus disease, collaboration with an otolaryngologist is important. Patients should be advised to avoid nose blowing or forceful sneezing (with a closed mouth), particularly if an orbital fracture is suspected.
Chronic enophthalmos can be difficult to fully correct, especially if longstanding, and may lead to persistent cosmetic and functional concerns if not addressed early.
0 Comments
