Biparietal Osteodystrophy Visualized on a Dermatologist's Scalp Examination.

Biparietal osteodystrophy, also known as biparietal thinning, is an uncommon illness that causes symmetrical thinning of the parietal bones. It primarily affects women in their sixth and seventh decades of life. We present a case of a 73-year-old female with osteoporosis and osteoarthritis who visited a dermatology clinic with a bulging mass around her vertex scalp, accompanied by episodes of dizziness and blurred vision. The patient had a history of head trauma, but the skull abnormality was observed prior to these episodes. Laboratory testing was unremarkable except for high vitamin D levels. Imaging studies, including CT and MRI, revealed bilateral parietal bone loss without cerebral anomalies. The patient was referred to neurology for further evaluation. This patient's presentation emphasizes the significance of including biparietal osteodystrophy in the differential diagnosis when patients report scalp abnormalities. Dermatologists should be aware of this condition and its potential links to osteoporosis and other systemic diseases.