A 60-year-old man presents with a salmon-colored, flat conjunctival lesion in the fornix of the right eye. MRI shows a homogeneously enhancing orbital mass with a 'fish-flesh' appearance on cut section. The most likely diagnosis is:
- A Orbital lymphoma (MALT type) ✓
- B Orbital melanoma
- C Orbital metastasis
- D Orbital inflammatory pseudotumor
Correct answer: A. Orbital lymphoma (MALT type)
Explanation
Orbital lymphoma, most commonly mucosa-associated lymphoid tissue (MALT) lymphoma, classically presents with a salmon-patch conjunctival lesion and homogeneous mass. It is the most common orbital lymphoma subtype. Melanoma is pigmented. Metastasis usually has a known primary. Inflammatory pseudotumor presents with pain and scleritis, not a salmon-colored patch.
Reference: Robbins and Cotran Pathologic Basis of Disease, 10th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.