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She was admitted to our hospital with computed tomography and magnetic resonance imaging findings suggesting calcification of the L3\/4 disc and a large intraspinal mass at the L2\u20134 level. The patient\u2019s symptoms did not improve with conservative treatment, and her muscle strength rapidly declined. Therefore, a right-sided L3 laminotomy was performed for decompression. Intraoperatively, a cystic intraspinal mass with calcification was observed, and upon incision, a toothpaste-like substance flowed out. Pathological examination revealed fibrous tissue with glassy deposits and calcifications. Postoperatively, the patient\u2019s symptoms resolved completely, with no recurrence observed at the 2-month follow-up and complete resorption of the calcification at the L3\/4 disc. 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