A Horrific Case of Proptosis: Salvaging Vision in a Pediatric Patient With Rapidly Growing Orbital Rhabdomyosarcoma.

We report the case of a four-year-old male who presented with painless right upper eyelid swelling initially treated as a chalazion. The swelling rapidly progressed within two weeks, resulting in non-axial proptosis, thereby restricting ocular motility and causing vision loss. Imaging revealed a large superomedial orbital mass with optic nerve displacement. Histopathology confirmed embryonal rhabdomyosarcoma (RMS) group III. This report highlights the importance of prompt biopsy, multidisciplinary care, and a multimodal approach in achieving favorable outcomes through early diagnosis and intervention despite rapid tumor growth and optic nerve involvement.