Clinical case of indolent primary medullary cancer

Medullary thyroid cancer (MRSH) has a high malignant potential in the vast majority of cases, but in some patients with MRSH is characterized by a sluggish, non-aggressive course, when patients with the presence of proven medullary carcinoma or distant metastases and / or relapse, can live without progression for a sufficiently long time. Such a course of a malignant tumor is called indolent. The article presents a clinical case of diagnosis and treatment of indolent primary MRSH in a patient with a duration of the disease of 11 years. Shows some features of the dynamics of the level of basal calcitonin and cancer-embryonic antigen (CEA), ultrasound characteristics and data of fine-needle puncture biopsy of the tumor. The phenomenon of indolent course of MRSH characterized, as a rule, by a high malignant potential, is probably due to the biological characteristics of the tumor and requires further research.