Orbital lymphoma constitutes the most common primary malignant orbital neoplasm in adults; the vast majority are B-cell lineage–derived, with extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT lymphoma) representing the predominant subtype, followed by diffuse large B-cell lymphoma, follicular lymphoma, and mantle cell lymphoma. The standard treatment for orbital lymphoma involves chemotherapy combined with low-dose radiotherapy, with some cases requiring additio…