As a pivotal advancement in ultra-high field MRI,7T MRI has transitioned from research-oriented applications to clinical implementation.Leveraging its ultra-high spatial resolution and superior signal-to-noise ratio,this technology enables a revolutionary shift in multi-dimensional imaging spanning macro-anatomical visualization to molecular metabolic characterization.Particularly in neurodegenerative disorders,cerebrovascular diseases,brain tumors and osteoarticular diseases,7T MRI emerges as an indispensable tool for precise diagnosis and ultrastructural imaging investigations.It presents a new perspective in early diagnosis of disease,monitoring of curative effect,evaluation of prognosis and even exploration of pathogenesis.

Purpose To analyze CT and MRI manifestations of rare primary malignant liver tumors in adults to improve the diagnostic accuracy.Materials and Methods This retrospective study analyzed imaging,clinical and pathological data from 28 patients with pathologically confirmed rare primary malignant liver tumors at the Affiliated Hospital of Zunyi Medical University(April 2011 to July 2024).Clinical presentations,laboratory findings,and CT/MRI characteristics of different tumor types were evaluated.Results The cohort included eight cases of hepatic sarcomatoid carcinoma,eight of primary hepatic lymphoma,six of primary hepatic gastrointestinal stromal tumor,three of intrahepatic biliary cystadenocarcinoma,and three of hepatic adenosquamous carcinoma.Distinct imaging features were observed:all eight sarcomatoid carcinomas presented as solitary,large cystic-solid masses;three showed progressive or persistent enhancement of solid components/septae,with four demonstrating portal vein tumor thrombus.Seven cases of primary hepatic lymphomas appeared as homogeneous,round/oval lesions,with one case restricted diffusion on diffusion weighted imaging,and seven cases exhibited mild homogeneous enhancement;two exhibited the vessel penetration sign;all six primary hepatic gastrointestinal stromal tumors manifested as cystic-solid masses with extensive central necrosis;two showed peripheral pseudocapsules while four had tortuous feeding vessels,with mild-to-moderate persistent enhancement of solid components;all three intrahepatic biliary cystadenocarcinomas occurred in the left lobe,presenting as multilocular cystic lesions with papillary mural nodules showing variable enhancement of walls,septations and nodules;two adenosquamous carcinomas demonstrated irregular morphology with distal biliary dilation and predominant delayed enhancement.Conclusion Imaging diagnosis of rare primary malignant liver tumors remains challenging.While some lesions demonstrate characteristic features,pathological confirmation remains essential for definitive diagnosis.

Purpose To analyze CT and MRI manifestations of rare primary malignant liver tumors in adults to improve the diagnostic accuracy.Materials and Methods This retrospective study analyzed imaging,clinical and pathological data from 28 patients with pathologically confirmed rare primary malignant liver tumors at the Affiliated Hospital of Zunyi Medical University(April 2011 to July 2024).Clinical presentations,laboratory findings,and CT/MRI characteristics of different tumor types were evaluated.Results The cohort included eight cases of hepatic sarcomatoid carcinoma,eight of primary hepatic lymphoma,six of primary hepatic gastrointestinal stromal tumor,three of intrahepatic biliary cystadenocarcinoma,and three of hepatic adenosquamous carcinoma.Distinct imaging features were observed:all eight sarcomatoid carcinomas presented as solitary,large cystic-solid masses;three showed progressive or persistent enhancement of solid components/septae,with four demonstrating portal vein tumor thrombus.Seven cases of primary hepatic lymphomas appeared as homogeneous,round/oval lesions,with one case restricted diffusion on diffusion weighted imaging,and seven cases exhibited mild homogeneous enhancement;two exhibited the vessel penetration sign;all six primary hepatic gastrointestinal stromal tumors manifested as cystic-solid masses with extensive central necrosis;two showed peripheral pseudocapsules while four had tortuous feeding vessels,with mild-to-moderate persistent enhancement of solid components;all three intrahepatic biliary cystadenocarcinomas occurred in the left lobe,presenting as multilocular cystic lesions with papillary mural nodules showing variable enhancement of walls,septations and nodules;two adenosquamous carcinomas demonstrated irregular morphology with distal biliary dilation and predominant delayed enhancement.Conclusion Imaging diagnosis of rare primary malignant liver tumors remains challenging.While some lesions demonstrate characteristic features,pathological confirmation remains essential for definitive diagnosis.

As a pivotal advancement in ultra-high field MRI,7T MRI has transitioned from research-oriented applications to clinical implementation.Leveraging its ultra-high spatial resolution and superior signal-to-noise ratio,this technology enables a revolutionary shift in multi-dimensional imaging spanning macro-anatomical visualization to molecular metabolic characterization.Particularly in neurodegenerative disorders,cerebrovascular diseases,brain tumors and osteoarticular diseases,7T MRI emerges as an indispensable tool for precise diagnosis and ultrastructural imaging investigations.It presents a new perspective in early diagnosis of disease,monitoring of curative effect,evaluation of prognosis and even exploration of pathogenesis.

Objective To identify the common factor affecting hospitalization expense of lens surgery operation, and propose effective measures to curb unreasonable increase of medical costs.Methods Collection of inpatients information of the year 2014 from a tertiary hospital in Beijing, for factor analysis of the hospitalization expenses of 555 inpatients categorized as DRGs of CB39 (lens surgery), using the BJ-DRGs platform.Results The highest factor of lens surgery expenses is disposable medical surgery materials, accounting for 42.77％;followed by surgery fee and medication fee, accounting for 23.19％ and 17.15％ respectively.Conclusion For the hospitals, medicine and medical material rank the highest in cost control, and they are recommended to work on them by means of clinical pathways, medical norms and purchasing policy, and to explore new means of payment in the meantime.