“…The disease may occur at every age, however, it most often affects children below 10 y/o, in whom it leads to atrophy of soft and osseous tissues, oral structures and teeth (deformation of the face and mandible, unilateral tongue atrophy, masseter muscle fatigue, soft and hard palate atrophy, mandible hypoplasia, atrophy of alveolar processes, malocclusion, delayed teeth eruption, teeth loss) [4,27]. In 20% of cases PFH may be accompanied by neurological symptoms (including headaches, migraines, convulsions, trigeminal nerve paralysis, paresthesia, hemiplegia, anomalies of intracranial vessels), and in 15% of case by ocular symptoms (including enophthalmos, strabismus, eyelid atrophy, uveitis, glaucoma, diplopia, Horner's syndrome, mydriasis) [27][28][29][30]. Guerrerosantos et al proposed a 4-grade classification of PFH based on the level of tissue atrophy: type 1 -minimal soft tissue atrophy in a severe phase of the disease, usually between the age of 10-20; type 2 -moderate soft tissue atrophy with no influence on osseous and cartilaginous tissues; type 3 -moderately severe soft tissue atrophy with atrophy of the osseous and cartilaginous tissues, typical for patients who developed the disease before the age of 10; type 4 -severe soft tissue atrophy with atrophy of the osseous and cartilaginous tissues, and disorders of affected organs (nose, oral cavity, eye) [31].…”