The role of calcium serum level in clinical manifestation and progress of psoriasis vulgaris in a patient with Fahr's syndrome.

Fahr's syndrome is a rare entity characterized by symmetrical and bilateral non-atherosclerotic intracerebral calcifications in the basal ganglia. This entity is usually asymptomatic or may present mainly with neuro-neuropsychiatric and dermatological manifestations. Secondary bilateral striopallidodentate calcinosis (BSPDC) presentations are associated with various diseases. We describe a case of psoriasis vulgaris associated with secondary BSPDC due to hypoparathyroidism. Laboratory tests revealed hypocalcemia, hyperphosphatemia, and a low parathormone serum level; on cerebral computed tomography (CT), bilateral basal ganglia calcification was observed. Correction of calcium deficiency restored the calcium-phosphate balance and led to an improvement in psoriatic lesions. Psoriasis vulgaris is a common condition that may be associated with disturbances in calcium metabolism. Dermatologists should be aware that investigating cases resistant to conventional therapies can uncover underlying systemic disorders that significantly affect patients' quality of life.