Central nervous system disorders are not uncommon in patients with hyperparathyroidism and hypercalcaemia. Usually these consist of neuropsychiatric disturbances but acute encephalopathies and seizures may occur. A rare manifestation is cerebral infarction. A patient is presented with neuroradiological evidence of infarction caused by cerebral arterial spasm which appears related to hypercalcae...

with oral conitraceptives. Without being able categorically to deny this possibility I think it unlikely for the following reasons. Retinol in human blood is predominantly bound to a specific transport-protedin known as the retinol-binding protein (RBP). Under physiological conditions RBP ibinds to prealbumin.4 The amount of free retinol is very small, indeed. Using a fluorescence assay5 measur...

Laboratory of Clinical Diagnosis and Clinical Pathology, School of Veterinary Medicine, Aristotle University of Thessaloniki, Stavrou Voutyra Street 11, Thessaloniki 546 27, Greece Clinic of Surgery, School of Veterinary Medicine, Aristotle University of Thessaloniki, Stavrou Voutyra Street 11, Thessaloniki 546 27, Greece Laboratory of Radiology, School of Veterinary Medicine, Aristotle Univers...