Hyperostosis frontalis interna (HOFI) is characterizedby the benign growth of the inner plate of the frontal bone. It is most commonin older women. Etiology is unknown. Morgagni-Stewart-Morel syndrome(MSM) ischaracterized by HOFI, obesity, hirsutism and mental illnesses but theseassociations are mostly based only on case reports. MSM syndrome is misunderstoodand less reported pathology. The clinical presentation is not well defined anditsfinding is usually coincidental. The patient may present variablesymptomatology. The idea that we should keep in mind is that HOFI representthemain pattern of MSM. Thus, it is highly importantto specify the presence anddegree of HOFI in radiological reports.