A 22-year-old woman with a history of hyperthyroidism and a paravagina
l alveolar rhabdomyosarcoma developed diplopia 3 months after successf
ul autologous bone marrow transplantation. Results of computed tomogra
phic scan showed apparent enlargement of the right inferior rectus mus
cle, and thyroid eye disease was suspected. However, results of furthe
r evaluation revealed an alveolar rhabdomyosarcoma that metastasized t
o the orbit.