Tocilizumab use in pediatric thyroid eye disease: First documented case.

PURPOSE: To report the first case of Tocilizumab treatment for progressive pediatric thyroid eye disease (TED) in a 9-year-old female. OBSERVATIONS: A 9-year-old female with a history of hyperthyroidism for 4 months presented with bilateral proptosis (more in the right eye) associated with retrobulbar pain, tearing, and conjunctival and caruncular redness. The exophthalmometry reading on presentation was 21mm OD and 17 mm OS. The patient was managed with observation and control of hyperthyroidism in the beginning. However, on a subsequent visit 3 months later it was observed that the symptoms and clinical findings were rapidly worsening. The exophthalmometry reading upon subsequent follow-up was 22 OD and 22 OS. After multidisciplinary team (MDT) discussions it was decided to treat the patient with four doses of 8mg/kg Tocilizumab injection on monthly basis. Notable improvement of proptosis and resolution of pain, conjunctival and caruncular redness was observed. The exophthalmometry reading 4 months after treatment was 20 OD and 19 OS. CONCLUSION AND IMPORTANCE: This case report opens an important gateway for the use of Tocilizumab in progressive TED in pediatric age groups.