Morgagni-Stewart-Morel Syndrome

Morgagni-Stewart-Morel (MSM) syndrome is a disorder characterized by thickening of the frontal bone of the skull (hyperostosis frontalis interna), as well as obesity and excessive hair growth (hypertrichosis). Other signs and symptoms may include seizures, headaches, diabetes insipidus, and sex gland disturbances. The cause of Morgagni-Stewart-Morel syndrome is not fully understood. Some instances of dominant inheritance have been reported, but whether it is autosomal dominant or X-linked dominant is not known. Treatment may include medication for headaches and seizures and surgery to remove the excessive bone of the skull.