I am a 49 year old woman, vit. D deficient and have developed a 2 inch. long dent in the top of my head center and slightly to the right about 1/8 to 1/4 inch deep, first noticed about 3 weeks ago. No pain. sometimes it does not feel as deep. I take RX 50,000 units of Vit. D one time per week. No head injury, not dehydrated. I have not been diagnosed with Osteoporosis. The only RX meds I take are the vit. D, Metoprolol, and Omeprazole other than that I take ASA 81mg and vitamins. Last blood work was about 3 months ago which was all normal. I have occasional dizziness, ( which is not new) and had a TIA about 10 years ago. What could this be.