Dear Editor, Hyperostosis frontalis interna (HFI) is a well-described entity from ancient times that occurs in 24% of women and 5.2% of men. 1 Although meaningful association between HFI and neurological disorders has not been proven, HFI frequently accounts for neuropsychiatric symptoms including frontal executive dysfunctions, epilepsy, cognitive impairments, parkinsonism, and frontal headache. 2-4 Here, we present an HFI case involving a woman with symptoms of depression and parkinsonism.
CASE PRESENTATIONA 78-year-old woman complained of excessive fatigue, decreased rate of speech, and motor behaviours over a period of five years. As a result, she was diagnosed with Parkinson's disease and was prescribed levodopa and levodopa/carbidopa/ entacapone in outpatient neurology clinics. Because of unresponsiveness to these treatments and the nonprogressive course, the patient was referred to geropsychiatric outpatient clinics. Her physical and mental examinations revealed excessively decreased rate of speech but not poverty of speech, hypophonia, and a thought rate in the normal range without delusion. Affect was limited, decrease in facial movements, and mood was dysthymic. The patient's spontaneous attention was impaired, but her memory was intact. Bradykinesia, bilateral +2 rigidity in the upper extremities, and gait with small steps but without tremor were noted. We performed cranial magnetic resonance imaging that revealed HFI (Fig. 1).The patient was assessed in a geriatrics consultation that aimed to exclude secondary causes of Figure 1 Brain computed tomography of the patient showing left frontal thickness (12.8 mm).bs_bs_banner