A 20-year-old woman presented with a rare case of intraorbital mesenchymal chondrosarcoma manifesting as a 6-month history of progressive ptosis and exophthalmos of her left eye. Computed tomography and magnetic resonance imaging revealed a partially calcified round mass occupying the postbulbar space. Partial removal of the tumor via a left fronto-orbital approach was performed. The histological diagnosis was mesenchymal chondrosarcoma, and additional intraorbital exenteration was performed. Neither chemotherapy nor radiotherapy was performed. She was free from tumor recurrence at the 6-year follow-up examination. Radical resection, including exenteration if possible, is recommended for intraorbital mesenchymal chondrosarcoma.
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