<prompt> A man with Pancoast tumor developed Horners syndrome. All of the following are the features of Horners syndrome, EXCEPT:Ptosis and Miosis in ipsilateral eyeAnhidrosis of ipsilateral faceHeterochromia iridesApparent exophthalmos  <response>: Horners syndrome consists of unilateral enophthalmos, ptosis, miosis, and loss of sweating over the ipsilateral half of the face or forehead anhidrosis. It is caused by ipsilateral involvement of the sympathetic pathways in the carotid plexus, the cervical sympathetic chain, the upper thoracic cord, or the brain stem. Melanocyte maturation in the iris depends on sympathetic innervation; thus, a less pigmented bluer iris occurs in congenital or longstanding acquired Horners syndrome. Ref: Riordan-Eva P., Hoyt W.F. 2011. Chapter 14. Neuro-Ophthalmology. In P. Riordan-Eva, E.T. Cunningham, Jr. Eds, Vaughan Asburys General Ophthalmology, 18e. 