ABSTRACT
A case of ossification of the posterior longitudinal ligament (PLL) at the cervical level one year after cervical irradiation is reported. This condition is rare in Caucasian people. The cause is unknown. The particular circumstances of ossification occurrence in the case reported allow us to propose a new etiological hypothesis.
Subject(s)
Ligaments/diagnostic imaging , Ossification, Heterotopic/diagnostic imaging , Radiation Injuries/diagnostic imaging , Adult , Female , Humans , Ossification, Heterotopic/etiology , Radiation Injuries/complications , Radiography , SpineABSTRACT
A sensitive spectrophotometric method for the determination of nickel, based on the reduction of a complex formed between molybdophosphoric acid and Ni(II) at pH 4.3 has been developed. Excess of molybdophosphoric acid is eliminated by complexation with sodium citrate. The method is rapid and the system obeys Beer's law up to 5 ppm of Ni(II). The molar absorptivity is 1.30 x 10(3) 1.mole(-1).mm(-1). The technique compares favourably with existing photometric methods for nickel in sensitivity and is reasonably selective.
