Objective To explore the multi-modal MRI characteristics of breast cancers in dense breasts.Methods 120 patients with breast cancer shown on mammography underwent breast MRI,which were solitary and confirmed by pathological examination. According to the BI-RADS classification of breast,the 120 cases were divided into two groups including dense type breast and non-dense type one.The differences in morphological features,ADC values (b=1 000 s/mm2 )and time-signal intensity curve (TIC)of the lesions between two groups were analyzed and compared.Statistical analysis was performed using SPSS1 6.0.Results The breast cancers in dense breast were vulnerable to have a spiculated margin (44/68 in the dense breast group vs.1 6/52 in the non-dense breast group,P =0.000).The size of the lesion in dense breast (1.83 ±0.98)cm was bigger than that in non-dense breast (1.40±0.46)cm (P =0.005).The non-mass-like enhancement of the lesion in dense breast was much more than that in non-dense breast (P =0.000).In addition,the average ADC values of the lesion in dense breast (0.89±0.12)×10 -3 mm2/s were lower than in non-dense breast (0.95±0.10)×10 -3 mm2/s(P =0.01 6).Conclusion The breast cancer in the dense breast has different MRI findings in comparison with non-dense breast.

ObjectiveTo understand the current situation and influencing factors of health service demands of new residents in Shanghai. MethodsFrom July to August 2020， a questionnaire survey was conducted in 1 358 new residents from 36 survey points in 7 districts of the city. The questionnaire included the basic medical insurance coverage in the inflow area， the current situation of medical demand and related influencing factors， and the demands for other health services. Results47.1%（562/1 194）of new residents did not choose to seek timely medical treatment when they were not feeling well. The main reason was that the working hours occupied the medical treatment time. Logistic regression analysis showed that the main factors affecting the medical needs in new residents were the average daily working hours， living area and type of residence， health status， physical examination and physical exercise， and the type of basic medical insurance. The demands of new residents for "health consultation of common diseases and frequently occurring diseases"， "health behavior intervention （such as smoking cessation and alcohol restriction）"， "medical guidance and publicity"， "accidental injury prevention （traffic， work， falling， etc.）" and "maintenance of legitimate rights and interests of health" were 57.1%（682/1 194）、41.3%（493/1 194）、34.9%（417/1 194）、32.2%（385/1 194） and 31.9%（381/1 194）， respectively. ConclusionNew residents demands for medical services cannot be met. We should actively improve the working and living conditions of new residents， improve the construction of new residents' health service system， and improve the utilization level of health services.