Echographic measurement of extraocular muscle thickness in proptosis

Echographic extraocular muscle thickness was measured in 102 eyes of 51 patients with proptosis of varied etiology. That of vascular origin was associated with extraocular muscle enlargement in all cases. Enlargement of the medial rectus was found to be statistically significant in thyroid orbitopathy. Sixty percent of cases with nonspecific orbital inflammatory disease had enlarged extraocular muscles. We discuss the supportive role of determining echographic measurements of extraocular muscle thickness in proptosis and highlight the uniform extraocular muscle enlargement found in proptosis of vascular origin.