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Fulltext Olanzapine-induced Cataract in a Teenage Girl

Lim CZ, Sonny Teo KS, Tai E

Cureus, 2018 Apr 30;10(4):e2553.
PMID: 29974009 DOI: 10.7759/cureus.2553

Cataract, defined as cloudiness of the lens, is a common adverse effect of first-generation antipsychotic medications. Newer generation antipsychotics, also known as atypical antipsychotics, are less commonly associated with cataract. A 19-year-old girl with underlying schizophrenia on olanzapine for the past two years complained of gradual blurring of vision in both eyes for four months prior to presentation. On examination, the best corrected visual acuity was counting finger in both eyes. The anterior segment examination showed bilateral diffuse cortical cataract precluding fundus examination. Systemic examination was unremarkable. Blood investigations revealed a high random blood sugar, which normalised after she was initiated on oral hypoglycemic medication. After bilateral lens aspiration, her visual acuity was 6/6 bilaterally. Olanzapine may be cataractogenic via its action as a serotonin antagonist, which results in reduced glucose responsiveness of the pancreatic beta-cells. Patients on anti-psychotic medication are at risk of developing diabetes mellitus and cataract compared to the general population. Screening for diabetes mellitus should be part of the follow-up of these patients. Ophthalmological evaluation is warranted in the presence of visual complaints.
Fulltext Atypical Presentation of Herpes Stromal Keratitis in a Contact Lens Wearer

Subramaniam R, Sonny Teo KS, Muhammed J

Cureus, 2023 May;15(5):e38438.
PMID: 37273371 DOI: 10.7759/cureus.38438

This article describes the case of a 21-year-old female habitual contact lens wearer who complained of left eye pain, redness, and decreased vision for one week. When a ring-shaped corneal infiltration indicative of an Acanthamoeba infection was discovered, standard anti-amoebic topical therapy with polyhexamethylene biguanide and chlorhexidine was commenced. However, her keratitis worsened. At the same time, corneal scraping revealed no pathogens. An anterior chamber examination revealed a loss of corneal sensation, and a positive herpes simplex virus (HSV) immunoglobulin G serology test indicated HSV keratitis. She was eventually treated with oral anti-viral medication and recovered completely. Her case was unusual, as she had a history of contact lens use, painful corneal ulceration, and the development of Acanthamoeba keratitis-like corneal ring infiltration. This case also reinforces the various manifestations of HSV keratitis, which lead to delayed diagnosis and treatment.
Fulltext Corticosteroid Therapy in Optic Neuropathy Secondary to Nasopharyngeal Carcinoma

Wahab Z, Tai E, Wan Hitam WH, Sonny Teo KS

Cureus, 2021 Mar 06;13(3):e13735.
PMID: 33842113 DOI: 10.7759/cureus.13735

INTRODUCTION: Nasopharyngeal carcinoma (NPC) is a tumor arising from the epithelial cells of the nasopharynx. NPC can spread and invade the base of skull, nasal cavity, paranasal sinuses, pterygopalatine fossa, and apex of the orbit. However, the involvement of the optic nerve in NPC is rare. The purpose of this case report is to report the efficacy of corticosteroid therapy in optic neuropathy secondary to NPC.
CLINICAL CASE: A 56-year-old Chinese woman, an active smoker, presented with a hearing deficit, persistent tinnitus and nasal congestion. Examination and investigations revealed the presence of a mass in the nasopharynx. Tissue biopsy revealed nasopharyngeal carcinoma. However, the Epstein-Barr virus was not tested. She was counseled for chemotherapy, but refused and was subsequently lost to follow up. She presented one year later with right eye ptosis associated with progressive worsening of diplopia and blurring of vision. Examination revealed multiple (second, third, fourth and sixth) cranial nerve involvement. Systemic examination and investigations revealed cervical lymphadenopathy and liver metastasis. Repeated imaging showed that the mass had invaded the base of the skull, cavernous sinus and orbital apices. Pulse dosing of corticosteroid therapy was commenced, resulting in dramatic improvement of vision.
CONCLUSION: Optic neuropathy may be the presenting sign of NPC. Corticosteroid therapy can offer immediate visual improvement.
Fulltext Extensive Cerebral Venous Sinus Thrombosis Post COVID-19 Vaccination

Foo LM, Wan Hitam WH, Ibrahim M, Sonny Teo KS

Cureus, 2023 Jan;15(1):e33637.
PMID: 36788859 DOI: 10.7759/cureus.33637

Extensive cerebral sinus thrombosis following severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccination is rare. We report the case of a 42-year-old man who presented with a severe generalized headache that was not relieved by analgesics for nine days. It started four days after he received the third dose of BNT162b2 (BioNTech/Pfizer). He also complained of numbness at the back of the neck, vomiting, mild blurring of vision, and diplopia. The visual acuity (VA) in the right eye was 6/9 (improved to 6/7.5 with a pinhole) and 6/6 in the left eye. He was not able to abduct both eyes and noticed a double image at lateral gaze. Fundoscopy showed swollen optic discs with the presence of disc hemorrhages. A computed tomography venogram (CTV) of the brain showed loss of normal signal void with filling defects in the superior sagittal sinus, straight sinus, bilateral transverse sinuses, bilateral sigmoid sinuses, and bilateral internal jugular veins. The nasopharyngeal swab sample was negative for SARS-CoV-2. His platelet was normal (271x109/L) and his coagulation profile was normal. Workup for connective tissue disease was negative. He was diagnosed with extensive cerebral vascular thrombosis post-vaccination. He received a one-week course of subcutaneous clexane, followed by oral anticoagulant treatment. After treatment, his headache was relieved, and the diplopia subsided. The venous thrombosis was partially resolved. Both the swollen optic discs improved, and his VA improved to 6/6 in both eyes.
Right Trochlear Nerve Palsy as an Uncommon Manifestation of Arachnoid Cyst

Subramaniam R, Wan Hitam WH, Sonny Teo KS, Nadarajan C

Cureus, 2023 Jan;15(1):e33579.
PMID: 36779122 DOI: 10.7759/cureus.33579

The majority of arachnoid cysts are congenital intracranial lesions that develop in the early embryonic stages as a result of a slight irregularity in the cerebrospinal fluid's (CSF) passage through the embryonic mesenchyme. Most of the time, these cysts are asymptomatic all throughout life. Diplopia caused by an arachnoid cyst is extremely rare. We present a rare event of isolated fourth nerve palsy in a 56-year-old woman brought on by an intracranial arachnoid cyst. Her only presenting symptom was vertical diplopia for one week. She denied any history of trauma. Ocular motility revealed limitation of abduction in her right eye. We proceeded with neuroimaging and the magnetic resonance imaging (MRI) confirmed the presence of a well-circumscribed left retro-cerebellar lesion which follows the CSF signal intensity in all sequences causing compression onto the posterior aspect of the left cerebellum, keeping with the diagnosis of an arachnoid cyst. This uncommon pathology tends to be difficult to diagnose and treat.
Fulltext Extensive Forehead Swelling Including the Periorbital Area in a Child: A Rare Manifestation of Acute Lymphoblastic Leukemia

Hanapi MS, Ghani SI, Sonny Teo KS, Wan-Embong WZ, Ariffin N, Wan Hitam WH

Cureus, 2018 Nov 03;10(11):e3539.
PMID: 30648072 DOI: 10.7759/cureus.3539

Acute lymphoblastic leukemia (ALL) manifestations in a child are varied. We report a unique and rare presentation of acute lymphoblastic leukemia in a child who presented with frontal swelling involving bilateral upper lids. A previously healthy one-year-old girl presented with progressively increasing frontal swelling of seven months duration. An examination revealed erythematous, firm, nontender forehead swelling that extended up to the medial part of bilateral upper eye lids. The extraocular muscle movement was normal. The anterior segment and fundus examination were also normal in both eyes. Other systemic examination revealed multiple leukemic cutis on the scalp. The cervical lymph nodes were also palpable with hepatosplenomegaly. A full blood picture (FBP) showed the presence of leucoerythroblastic blood film with 62% blast cells. Flow cytometry and bone marrow aspiration confirmed the diagnosis. Computed tomographic (CT) scan images revealed multiple well-defined hyperdense lesions at the subcutaneous skull with the largest lesion at the anterior glabella. Upon diagnosis, the patient was started on chemotherapy and the swelling resolved after one month post treatment. Extensive forehead swelling is a rare manifestation of acute lymphoblastic leukemia. A high index of suspicion aided with diagnostic investigations could help the doctors arrive at a correct diagnosis and treatment.
Nystagmus and diplopia in a patient with positive aquaporin-4 antibody

Koh KL, Sonny Teo KS, Halim SA, Wan Hitam WH

Can J Ophthalmol, 2019 04;54(2):e66-e69.
PMID: 30975364 DOI: 10.1016/j.jcjo.2018.06.022
Fulltext Posterior Vitreous Detachment Precipitated by Yoga

Chong SY, Fhun LC, Tai E, Chong MF, Sonny Teo KS

Cureus, 2018 Jan 24;10(1):e2109.
PMID: 29581921 DOI: 10.7759/cureus.2109

Yoga has recently been touted as a means to improve physical and mental well-being. However, no form of exercise is without its risks. A 32-year-old Chinese female with moderate myopia complained of right eye sudden onset of floaters and mild blurring of vision after the head-down posture. The visual acuity was 6/12 in the right eye and 6/9 in the left eye. A right eye fundus examination showed posterior vitreous detachment, with a small blood clot located at the inferior margin of the optic disc. The patient was diagnosed with right eye vitreous hemorrhage secondary to acute posterior vitreous detachment and was managed conservatively. Acute changes in posture, especially between an upright and a head-down position, may cause acute posterior vitreous detachment. As yoga practitioners may be required to assume this head-down position, myopic patients should be warned of the possible ocular complications of this exercise.
Non-arteritic anterior ischaemic optic neuropathy secondary to menorrhagia in a young healthy woman

Koh KL, Sonny Teo KS, Chong MF, Wan Hitam WH

BMJ Case Rep, 2018 Jun 27;2018.
PMID: 29950366 DOI: 10.1136/bcr-2018-225113

Non-arteritic anterior ischaemic optic neuropathy (NAION) may develop due to severe anaemia and hypotension which is seen in acute blood loss. The devastating visual loss is often irreversible. We report a case of NAION in a 20-year-old healthy woman, who presented on the third day of a heavy menstrual cycle with hypovolaemic shock. On day 2 of admission, she had sudden right eye blurring of vision at the superior field on awakening from sleep. Funduscopy revealed a pale and swollen right optic disc. There was a dense right superior altitudinal visual field defect. Her haemoglobin level was low (3.6 g/dL), but she refused blood transfusion due to her religious belief (Jehovah's Witness) and opted for conservative management. She later developed right optic atrophy with persistent visual field defect despite an improved haemoglobin level of 10.5 g/dL.
Fulltext Bilateral Serous Retinal Detachment in Pregnancy

Phang DSK, Ariffin N, Abd Aziz H, Vendargon FM, Sonny Teo KS

Cureus, 2022 Oct;14(10):e30019.
PMID: 36348857 DOI: 10.7759/cureus.30019

Serous retinal detachment is a rare complication of pregnancy. A 30-year-old primigravida with preeclampsia presented with bilateral blurring of vision and metamorphopsia for a one-week duration. She was referred by the Obstetrics and Gynecology department for visual assessment. Her best corrected visual acuity was 6/7.5 in both eyes. Fundus examination revealed bilateral serous retinal detachment involving maculae. She was treated conservatively and her blood pressure normalized after delivery. There was a partial resolution of subretinal fluid one-month post-delivery and a complete resolution of subretinal fluid three months later. Her final best corrected visual acuity was 6/6 and N5 in both eyes. The management of serous retinal detachment is conservative with a good visual outcome.
Fulltext Orbital Apex Syndrome Secondary to Huge Primary Ethmoidal Sinus Mucocele: A Case Report

Loh SA, Wan Hitam WH, Ramli RR, Sayuti KA, Sonny Teo KS

Cureus, 2023 Feb;15(2):e34853.
PMID: 36923171 DOI: 10.7759/cureus.34853

Ethmoidal sinus mucoceles are benign expansile lesions that may progressively invade the orbit causing optic nerve compression and its nearby structures. We report a rare case of primary ethmoidal sinus mucocele instigating orbital apex syndrome. A 40-year-old man presented with right eye (RE) progressive blurring of vision with diplopia for 2 weeks. It was preceded by right-sided facial pain for 3 months. Clinical examination revealed RE proptosis with multiple cranial nerves palsy involving right cranial nerves II, III, IV, V, and VI, suggestive of right orbital apex syndrome. Magnetic resonance imaging (MRI) demonstrated right eye proptosis and right ethmoidal mucocele with intracranial and right intraorbital extension compressing the right medial rectus and optic nerve. The patient underwent an uncomplicated endoscopic sinus surgery resulting in a return to normal appearance and function post-operation. Thus, ethmoidal mucoceles are benign and curable with early recognition and intervention.
Fulltext A Unique Case of Unilateral Oculomotor Nerve Palsy Secondary to Dengue Fever

Loh SA, Wan Abdul Rahman WMH, Sonny Teo KS, Abu N

Cureus, 2023 Feb;15(2):e35281.
PMID: 36994298 DOI: 10.7759/cureus.35281

A wide range of ocular complications may arise from the mosquito-borne illness, dengue fever. We report a case of isolated unilateral oculomotor nerve palsy due to complications of dengue fever. A 50-year-old male with serologically confirmed dengue fever presented with a sudden onset of double vision with left eyelid drooping and left eye outward deviation on his day 8 of illness. Ocular examination revealed binocular diplopia with complete left eye ptosis and restriction of all left eye movements except for abduction. His left eye pupil was 8 mm dilated with a negative relative afferent pupillary defect (RAPD). A clinical diagnosis of left eye oculomotor nerve palsy with pupil involvement was established. Urgent contrasted brain imaging tests were performed and revealed to be normal. He was managed conservatively and had complete resolution of symptoms with good vision recovery within 3.5 months. Cranial mononeuropathy may be one of the various complications following dengue fever, as demonstrated in this case report. As it is an uncommon presentation, there is a need to exclude other acute causes of cranial nerve palsy. Visual prognosis is still favorable with judicious monitoring and without any treatment of steroids or immunoglobulin.
Fulltext A Rare Complication of Herpes Zoster Ophthalmicus (HZO)

Phang DSK, Ettikan JV, Abd Aziz H, Vendargon FM, Sonny Teo KS

Cureus, 2023 Mar;15(3):e35693.
PMID: 37012964 DOI: 10.7759/cureus.35693

Retrobulbar optic neuritis is a rare complication of herpes zoster ophthalmicus (HZO). We report a case of a 27-year-old man who presented with a progressive left blurring of vision for one week. A history of vesicular rashes in the left trigeminal nerve area preceded his condition. On examination, we noted that his left eye visual acuity was hand movement, and his optic nerve function was reduced. Findings from examining the anterior segment and intraocular pressure were unremarkable. The fundus examination results were normal. A blood investigation was positive for human immunodeficiency virus (HIV). MRI showed hyperintense features of the intraorbital segment of the optic nerve in the T2-weighted image. An abnormal high signal on a T2 weighted image may be present, which may be a clue for varicella zoster associated complications, such as HZO-related optic neuritis. Therefore, a diagnosis of retrobulbar optic neuritis was made, and antiviral treatment was initiated. He received two weeks of IV acyclovir and switched to the oral route for one month. After the completion of the treatment, his visual acuity remained the same.

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