Hyperostosis Frontalis Interna (HFI) is Common in 70-Year-Old Women
HFI occurs in approximately 16-18% of women aged 70 years, making it a relatively common age-related finding in this demographic.
Prevalence Data
The prevalence of HFI in 70-year-old women is well-documented in the research literature:
- In women aged 65+ years: The prevalence reaches approximately 16.4% in the oldest age group (>65 years) 1
- Overall rate in elderly women: Studies show an 18.14% occurrence rate in deceased females with an average age of 68.3 years 2
- Age-dependent progression: Unlike men, women demonstrate a clear age-related increase in HFI prevalence, with the condition being significantly more common after menopause 1, 3
Sex and Age Differences
The epidemiology of HFI shows striking demographic patterns:
- Female predominance: HFI is overwhelmingly more common in women, with 87.5% of severe cases occurring in females over 65 years old 4
- Male comparison: Men show minimal age-related changes in frontal bone thickness and have significantly lower HFI rates across all age groups 1
- Postmenopausal association: The condition is particularly prevalent in postmenopausal women, suggesting hormonal influences 4, 5
Clinical Context
Age is a predicting factor for HFI occurrence specifically in females 3. Women younger than 55 years have similar (low) risk as males, but this risk increases substantially with advancing age. The frontal bone thickness in women becomes progressively greater with age (Spearman's Rho 0.11; p≤0.01), while no such correlation exists in men 1.
Important Caveats
- Asymptomatic nature: Most HFI cases are incidentally discovered, as the condition is often asymptomatic
- Severity classification: The 16-18% prevalence includes all grades of HFI; severe forms (Type D) are less common but still predominantly affect elderly women
- Slow progression: HFI progresses at approximately 3 years per millimeter of bone thickness, meaning it develops gradually over decades 6
The total prevalence across all age groups and both sexes is approximately 8.1-12.5% 1, 4, but this figure is heavily skewed by the high prevalence in elderly women, making 70-year-old women a particularly affected demographic.