Ultrasound combined with contrast‑enhanced ultrasound in the diagnosis of primary squamous cell carcinoma of the thyroid: A case report and literature review.

Primary squamous cell carcinoma of the thyroid (PSCCT) is a rare malignancy with a poor prognosis. Therefore, early diagnosis and treatment are critical to the survival of patients and to improve their quality of life. However, diagnosing this illness is challenging.

[Analysis on Spatial Variability of Hydrochemical Characteristics and Control Factors of Jinan Baotu Spring Area].

To understand the karst groundwater hydrochemical characteristics and ion sources of the Jinan Baotu Spring area, this study focused on the three functional zones as an indirect recharge area, direct recharge area, and discharge area. Through water sample collection and testing, the spatial variability of groundwater chemical characteristics in different functional zones and the formation mechanism were analyzed using hydrochemistry parameter statistics, multivariate statistics, self-organizing map, hydrochemistry graphical analysis, ion ratios, and other methods, guided by the theory of groundwater flow system and combined with regional physical geography and hydrogeological conditions. The results showed that： the groundwater of each functional zone was alkaline as is typical in the dissolution of carbonate minerals.