Fig. 1

Illustration of intraoperative parathyroid glands (case 15). A Photograph of parathyroid adenomas of right upper and lower parathyroid glands in the patient with recurrent primary hyperparathyroidism (indicated with arrows). B Photograph of the right parathyroid adenomas showing autofluorescence in near-infrared light (indicated with the arrow). C Normal left lower parathyroid gland is presented as fragments of tissue after surgical interventions on the left side (indicated with circle). D Photograph of autofluorescence signal of fragmented left lower parathyroid in near-infrared light (indicated with circle)