Abstract
Idiopathic orbital pseudotumor is a benign, noninfectious, and nonneoplastic disease with unknown cause. It is the third most common orbital disease after thyroid orbitopathy and lymphoproliferative disorder. Idiopathic orbital pseudotumor is extremely rare in pediatric age group and may cause real diagnostic problems. This paper describes a 4-year-old girl who presented with sudden ptosis in the right eye and swollen eyelid. She recovered completely with high-dose steroid therapy. We report clinical and magnetic resonance imaging findings of orbital myositis, which is a rare subtype of idiopathic orbital pseudotumor in children and needs to be differentiated from other orbital disease especially malignancy.
Highlights
Idiopathic orbital pseudotumor (IOP) is a nongranulomatous inflammatory process in the orbit with no known local or systemic causes
Pediatric cases account for 11.5% of the total population of cases with IOP [2], and several conditions such as cellulites, rhabdomyosarcoma, and leukemia are considered in the differential diagnosis in children [3]
We present an unusual case of myositic type of IOP in a child
Summary
Idiopathic orbital pseudotumor (IOP) is a nongranulomatous inflammatory process in the orbit with no known local or systemic causes. The most frequent subtype of IOP is a local mass within the orbit (50%), followed by dacryoadenitis (29%), myositis (8%), perineuritis (4%), eyelid pseudotumor (4%), and diffuse orbital inflammation (4%) [1]. Pediatric cases account for 11.5% of the total population of cases with IOP [2], and several conditions such as cellulites, rhabdomyosarcoma, and leukemia are considered in the differential diagnosis in children [3]. Magnetic resonance imaging (MRI) plays an important role in imaging diagnosis [4]. In this case report, we present an unusual case of myositic type of IOP in a child
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