DOI: https://doi.org/10.21203/rs.3.rs-1374791/v1
Purpose
To report a case of an intra-orbital wooden foreign body that remained asymptomatic for the initial eight months following a traumatic event.
Observation
A 33-year-old male presented with sudden onset right lower lid swelling and tearing. He was initially tolerating the symptoms, however, it got progressively worse, so he came two weeks after the initiation of symptoms. His eye vitals were within normal limit, including the visual acuity of 6/6 OU. Additionally, slit lamp and fundus examinations were benign. Concern was for infectious etiology with unclear source. After a lengthy conversation, he recalled falling on the ground with face down about eight months ago. However, he stated that he had remained asymptomatic and never went for treatment after the incident. Non-contrast CT of head and orbit showed hyperdense tract in medial aspect of right eye adjacent to the globe, piercing across the bilateral ethmoidal sinuses. Thus, a diagnosis of retained IOrbFB was made. He underwent surgery where a 5cm rotten wood was extracted. Post-surgical course was uncomplicated.
Conclusion
Not all penetrating intra-orbital foreign bodies present immediately after the incident. In our case the patient remained asymptomatic for eight months. Therefore, when dealing with an ocular infection of unclear source, clinicians should ask about distant histories of ocular or facial injuries to assess intraocular foreign bodies.
Periorbital swelling can be due to various causes like infections, drug reactions, hypersensitivity reactions, systemic contact dermatitis, SLE, dermatomyositis, solid facial edema, angioedema, superior vena cava syndrome, sarcoidosis, ocular trauma, and others1. Ocular trauma is one of the major causes for blindness worldwide, and around 16% of ocular trauma are associated with foreign bodies (FB)2. Although intra-orbital foreign bodies (IOrFBs) are commonly seen in daily ophthalmology practice, rarely, they can have very unusual clinical presentations, especially nonmetallic FBs. For example, in CT scan, wood initially present with low density and may appear as air. It takes time to change its density which may often result in delayed or missed diagnosis3. In contrast, metallic FB can be easily detected via CT scans.
Without the help of advance imaging techniques, diagnosing the cause of periorbital swelling can be challenging, give the wide differential diagnosis. Clinicians have to rely just on the provided history and performed physical examination. Particularly challenging is post-trauma periorbital swelling. Various studies have reported that the time between a trauma and final diagnosis can vary from 24 hours to 50 years4,5.
Here, we report an unusual case of an intra-orbital wooden foreign body that presented eight months after the incident as the patient remained asymptomatic in the interim. It is rare because the injury was severe enough to penetrate both eyes, yet his vision remained unchanged.
A 33-year-old male presented with complains of right lower lid swelling with right eye tearing, onset two weeks prior to presentation without visual changes, vision loss, nausea, vomiting, and seizures. He is a farmer by profession. Eight months ago, he sustained facial trauma after a fall on a street. Following the incident, he had mild epistaxis and small laceration below the right lower lid. He was very confident that he did not sustain any penetrating injury. Following the incident, he went to a local clinic to treat laceration and had a short course antibiotic ointment. He became completely asymptomatic 10 days later.
Two weeks prior to presentation, he noticed a sudden-onset right lower lid swelling associated with excessive tearing of the right eye, getting progressively worse. His vitals were stable. Physical examination was negative for icterus, pallor, lymph nodes enlargement or rashes. Ocular examination revealed best uncorrected visual acuity (BUVA) of 6/6 in both right (OD) and left eyes (OS). OS appeared normal, but OD was watery with edematous lower lid and small wound as shown in Figure 1. The area was tender to palpate. There was no relative afferent pupillary defect (RAPD). Intraocular pressure of right and left eyes was 12 and 10 mmHg respectively. Slit lamp and fundus examination of both eyes (OU) revealed normal findings.
Routine investigations such as complete blood counts with differential and comprehensive metabolic panel were within normal limits. Based on the remote history of trauma, with the suspicion of retained intra-orbital foreign body, orbital X-ray was performed, but it was benign. Realizing X-ray often misses nonmetallic FBs, non-contrast CT of head and orbit was done which showed hyperdense tract in medial aspect of right eye adjacent to the globe, piercing across the bilateral ethmoidal sinuses with the tip reaching the apex of left orbit in the region of insertion of medial rectus as shown in figure 2. Thus, a diagnosis of retained IOrbFB was made.
The patient was admitted for the IOrbFB removal surgery via anterior orbitotomy. Post-operatively, a wooden material of 5 cm which looked rotted was revealed as shown in figure 3 and 4. Then, the orbit was copiously irrigated with Gentamicin antibiotic solution. Oral antibiotics (amoxicillin-clavulanate 625 mg Q6hrly) and pain medications (Ibuprofen 500mg Q8hrly) were continued for 5 days post operatively. The swelling and discomfort on right eye resolved following 2 days after the surgery. Surgery and post-op courses were uncomplicated. The patient was discharged on post-op day 4 and was completely asymptomatic on post-op day 7 follow up.
Recognizing retained orbital foreign bodies secondary to trauma can be a challenge. Patients may not recognize that their injury involved an object entering the orbit and the initial history and mechanism of injury can be unclear as we saw in our case. Our patient was able to remember the exact mechanism of his injury but was confidently denied intra-ocular foreign body penetration.
IOrbFBs commonly presents with orbital cellulitis, orbital hematoma, proptosis, impaired motility, diplopia, visual field loss, orbital abscess, optic neuropathy/ atrophy, Superior orbital fissure syndrome6. Therefore, it is very important to obtain a detailed trauma history and to perform a thorough physical examination. A foreign body with extension up to the orbital apex and beyond often results in optic neuropathy and permanent damage to the neurovascular structures7. However, our patient was fortunate that there were no signs of neurovascular structure damages, despite FB reaching the tip of the left orbit.
Although FBs like metal, plastic, and glass are easily detected with conventional radiographs like X-rays, organic FBs like wood are often missed. Therefore, with the feasibility to calculate Hounsfield Units (HU) to differentiated tissues and with the capacity of higher geometrical resolution, CT is the gold standard method to detect wooden foreign bodies (WFB)8. Meanwhile, performing magnetic resonance imaging (MRI) in orbital FBs is still controversial9. Penetrating organic FBs often lead to acute inflammatory reaction when left unremoved which can lead to an abscess, fistula, and granuloma formations10,11.
Organic IOrbFBs like wood must be surgically removed and copiously irrigated with antibiotics as they often lead to infections and complications; whereas metallic FBs can be safely monitored without acute intervention as they are less likely to elicit inflammatory reactions12.
Our case was perplexing because of its rare, atypical presentation. Despite patient’s initial hesitation to pursue penetrating injury workup, eventually, we were able to obtain a comprehensive history, perform thorough examinations, ordered appropriate tests and imaging to reach a definitive diagnosis. Additionally, this case gave us an insight that organic IOrbFB following a penetrating injury can remain asymptomatic for a significant period, resulting in delayed diagnosis and treatment. Our patient was lucky that he did not have intra-orbital complications during the interim. Based on this case, it seems reasonable to encourage the public to sought out eye care following a peri-orbital trauma, even if a patient does not have immediate ocular problems.
Ethical approval and consent to participate:
Ethical approval was obtained from the Research committee at the Institute of Medicine, which was where the patient received treatment. Verbal consent was obtained from the patient to write and publish this article.
Consent for publication:
Verbal consent was obtained from the patient to write and publish this article.
Availability of data and materials: Not applicable
Competing interests: Does not exist
Funding: Not applicable
Authors’ contributions:
Kamal Pandit, MBBS, Bivek Wagle, MD wrote the manuscript text. Arika Poudel, MBBS prepared all figures. Sagun Narayan Joshi, MD and Gulshan Bahadur Shrestha, MD oversaw the care of the patient. They also supervised the project. All authors reviewed the manuscript.
Acknowledgements: Authors would like to acknowledge the patient who kindly agreed to be a case for this report. We would also like to acknowledge everyone involved in this patient’s care.
Author’s information: Please contact the corresponding author.
Disclosure: No financial or personal conflict of interest to disclose.