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Korean J Neuromuscul Disord > Volume 12(2); 2020 > Article
Korean Journal of Neuromuscular Disorders 2020;12(2):39-43.
DOI: https://doi.org/10.46518/kjnmd.2020.12.2.39    Published online December 31, 2020.
Isolated Unilateral Ptosis Caused by Idiopathic Orbital Myositis
Jeong Hee Cho1, Sohi Bae2, Taedong Ok3, Chan Wook Park3
1Department of Neurology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
2Department of Radiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea
3Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
특발안와근염에 의한 단독 눈꺼풀처짐
조정희1, 배소희2, 옥태동3, 박찬욱3
1국민건강보험 일산병원 신경과
2국민건강보험 일산병원 영상의학과
3연세대학교 의과대학 신경과학교실
Correspondence:  Jeong Hee Cho, Tel: +82-31-900-3026, Fax: +82-31-900-0343, 
Email: jhcho.neuro@gmail.com
Received: 31 October 2020   • Accepted: 23 December 2020
Abstract
Idiopathic orbital myositis is considered as a subgroup of idiopathic orbital inflammatory disease. It is a non-infectious inflammatory disorder primarily affecting the extraocular muscles and causes various eye symptoms including pain, diplopia and limitation of extraocular movement. Cases of isolated ptosis by idiopathic orbital myositis have been very rarely described in the literature. We report a patient who developed unilateral painless ptosis caused by idiopathic orbital myositis. A 52-year-old man presented with drooping of the right eyelid for 3 days. There was no history of headache, double vision or any other complaints. Neurological examination revealed right ptosis without pupil and extraocular muscles involvement. Repetitive nerve stimulation test was normal. Ptosis did not improve after the neostigmine injection. Magnetic resonance imaging scan showed asymmetric enlargement of right superior rectus/levator palpebrae superioris muscle complex and medial rectus muscle. Ptosis resolved dramatically after oral corticosteroid therapy. Isolated unilateral ptosis can be caused by various etiologies. Idiopathic orbital myositis should be considered in the differential diagnosis of ptosis.
Key Words: Orbital myositis, Blepharoptosis, Oculomotor muscles
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