ODP482 Graves Orbitopathy Secondary to Alemtuzumab Infusion for Multiple Sclerosis

: Presentation: This is a 51-year-old male with a history of Graves disease who presented to the ED with worsening proptosis and 10/10 eye pain. He reported being unable to shut his eyes, photophobia, decreased vision, and extreme eye sensitivity to touch. He was initially diagnosed with Graves disease 3 months ago, after which he was started on Methimazole 15mg 3x a day. Patient has a history of multiple sclerosis treated with an Alemtuzumab infusion 6 months ago. He additionally reports a history of depression, smoking, and alcoholism. Hospital Course: The patient presented with stable vitals signs with T: 36.5 C, HR: 97, BP: 117/68, O2 Sat 98% on RA. Physical exam was notable for Va: 20/100 OD, 20/200 OD with near card Sc. The R pupil was dilated Nr OU. EOM exam was notable for restricted ductions in all fields of gaze OU. IP was 20 mmHg OD and 22mmHg OS with Toponen 95%. Significant Proptosis OS more than OD with resistance to retropulsion. Bilateral conjunctival erythema with clouded corneas. Labs were significant for Hgb 12.2, MCV 80, Plt 342, ANC 12.1, Creatinine 0.69, albumin 2.8, Alk Phos 158, CK 41, FT4 0.53, TSH 0.318, and FT3 1.63. An US of the thyroid was significant for thyromegaly and a 5mm right thyroid nodule. A CT Orbit/Sella was significant for thyroid associated orbitopathy with greater exophthalmos on the left and maxillary sinusitis. The patient received 1000mg Rituximab infusion and IV Decadron every 4 hours with referral for possible thyroidectomy, orbital decompression as per ophthalmology, and continued multiple sclerosis management as per neurology. DISCUSSION: This complex case highlights worsening Graves orbitopathy as a rare side effect of Alemtuzumab. This orbitopathy persisted despite high dose methimazole. Urgent IV Decadron with orbital decompression should be considered in the acute setting with thyroidectomy for symptom resolution. Presentation: No date and time listed