Proptosis in children with acute-onset accompanied by signs of inflammation is commonly caused by orbital cellulitis, however, the possibility of rhabdomyosarcoma should always be considered by the clinician. This is a case report of a five-year-old boy presenting with an acute-onset of proptosis without a history of trauma and systemic infection. Our clinical differential diagnosis included orbital cellulitis and orbital rhabdomyosarcoma.To report a case of orbital cellulitis that clinically and radiologically mimics rhabdomyosarcoma.A five-year-old boy presented with rapid-onset proptosis, periorbital edema, pain and visual loss in the left eye for two weeks without a history of trauma, upper respiratory tract infection, sinusitis or immunosuppression. Our clinical differential diagnosis includes rhabdomyosarcoma and orbital cellulitis. Complete blood count reveals a leukocytosis. Multislice computed tomography (MSCT) scan shows lesions involving the lateral orbit and the retro bulbar space. Antibiotics combination and adjunct anti-inflammatory intravenously shows excellent clinical resolution.The study demonstrates difficulty in differentiating acute orbital cellulitis from rhabdomyosarcoma based on clinical findings. In addition, the case highlights that antibiotic combination of cephalosporin and aminoglycosides together with an adjuvant corticosteroid as an anti-inflammatory was effective in the case of acute orbital cellulitis.
