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[Recurring secondary hyperparathyroidism: case report].

The authors report a rare case of persistently recurring secondary hyperparathyroidism concomitant with chronic renal insufficiency. The patient underwent multiple surgical interventions (parathyroidectomy, implantation of parathyroid autograft into a forearm muscle, removal of hyperplastic autograft tissue). Results of clinical, laboratory, instrumental, and morphological studies are presented. Possible causes of relapses and problems of morphological diagnosis are discussed.