Radiation dose to the ocular lens, parotid gland and thyroid gland during fluoroscopy-guided DCP was 25 times higher than during diagnostic dacryocystography. The radiation dose to radiosensitive head and neck organs and tissues during fluoroscopy-guided DCP is much below the threshold dose for ocular lens cataract.

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Lack of pathological levels of CRP, procalcitonin and white blood cell count does not exclude cerebral abscess in a patient with prolonged fever and without marked neurological deficits. Preceding treatment with immunosuppressive drugs, especially MTX, and failing response to cephalosporins should lead to consideration of listeriosis in the differential diagnosis.

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