Improvement of Orbital Intramuscular Hemangioma Following Delivery.

A 34-year-old primigravida woman at 26-week gestation presented with gradually progressive right eye proptosis since the early stage of pregnancy. On the first examination, the right eye had 7 mm proptosis, compared with the left eye. Magnetic resonance images demonstrated enlarged inferior and medial recti muscles with tendon involvement. The results of pathological examination of a specimen harvested from the medial rectus muscle lesion 1 month after the delivery corresponded to an intramuscular cavernous hemangioma. Three months after biopsy, the right eye had a 3-mm reduction in proptosis, and magnetic resonance images showed slight reduction in size of the medial rectus muscle lesion. The maximum diameter of the right medial rectus muscle measured on axial images decreased from 13.13 to 9.38 mm. The patient underwent balanced orbital decompression 8 months after the biopsy. At 9-month post-decompression period, the right eye had 3.5-mm proptosis, and the vision was stable.