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Calcification of anterior longitudinal ligament of spine is commonly seen in ankylosing spondylitis and is also noted secondary to spondylosis, trauma and infection. Calcification of posterior longitudinal ligament is rare. Though calcification and ossification of posterior longitudinal ligament have been described in the past (Ongi and Akiyama 1967), no clinical manifestations were recognized until in 1960, when Tsukimoto (writing in Japanese), described how ossified posterior longitudinal ligament could compress the cord and produce severe cervical myelopathy. Since then several similar Cases have been described in Japan. It is claimed to be more frequent in the Japanese for some unknown reason. It forms about 0.7 percent of spinal disorders in the Japanese. In 1969 Minagi and Groner reported 2 cases in Caucasians. So far hardly a dozen cases have been reported in non-Japanese races. On account of the paucity of cases in English literature and to the best of our knowledge there being no reports from our country, this report of 26 cases is presented and its incidence, pathogenesis and treatment discussed.