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Arch Ophthalmol. 2004;122:749.

Congratulations to the winner of our January quiz, Manpreet Singh Chhabra, MBBS, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi. The correct answer to our January challenge was primary orbital melanoma. For a complete discussion of this case, see the Clinicopathologic Reports, Case Reports, and Small Case Series section in the February ARCHIVES (Mandeville JTH, Grove AS; Dadras SS, Zembowicz AM. Primary orbital melanoma associated with an occult episcleral nevus. 2004;122:287-290).

Figure 1. Magnetic resonance imaging of the orbits. Coronal, non–contrast-enhanced, T1-weighted image reveals a tumor surrounding the right optic nerve.

Be sure to visit the Archives of Ophthalmology Web site (http://www.archophthalmol.com) and try your hand at our Clinical Challenge Interactive Quiz. We invite visitors to make a diagnosis based on selected information from a case report or other feature scheduled to be published in the following month's print edition of the ARCHIVES. The first visitor to e-mail our Web editors with the correct answer will be recognized in the print journal and on our Web site and will also be able to choose one of the following books published by AMA Press: Clinical Eye Atlas, Clinical Retina, or Users' Guides to the Medical Literature.