Background. Uterine Mullerian adenosarcoma (UMA) is a rare and low- grade variant of mixed mesodermal tumor. UMA recurrences including heterologous sarcomatous elements are extremely rare, with only 3 cases reported t...Background. Uterine Mullerian adenosarcoma (UMA) is a rare and low- grade variant of mixed mesodermal tumor. UMA recurrences including heterologous sarcomatous elements are extremely rare, with only 3 cases reported thus far. Case. We present a case of UMA recurring as heterologous sarcoma three times in 8 months for 9.4 years after primary treatment. The number and grade of sarcomatous components increased with each recurrence eventually resulting in loss of the patient. Conclusion. The presence of multiple sarcomatous elements of high histological grade in the recurrent tumor following UMA may indicate an unfavorable prognosis with common recurrences and fatal outcome. All UMA patients carry risk of late recurrence, therefore, they should receive long- term follow- up.展开更多
The dissimilar friction stir welding of pure copper/1350 aluminum alloy sheet with a thickness of 3 mm was investigated. Most of the rotating pin was inserted into the aluminum alloy side through a pin-off technique, ...The dissimilar friction stir welding of pure copper/1350 aluminum alloy sheet with a thickness of 3 mm was investigated. Most of the rotating pin was inserted into the aluminum alloy side through a pin-off technique, and sound welds were obtained at a rotation speed of 1000 r/min and a welding speed of 80 mm/min. Complicated microstructure was formed in the nugget, in which vortex-like pattern and lamella structure could be found. No intermetallic compounds were found in the nugget. The hardness distribution indicates that the hardness at the copper side of the nugget is higher than that at the aluminum alloy side, and the hardness at the bottom of the nugget is generally higher than that in other regions. The ultimate tensile strength and elongation of the dissimilar welds are 152 MPa and 6.3%, respectively. The fracture surface observation shows that the dissimilar joints fail with a ductile-brittle mixed fracture mode durin~ tensile test.展开更多
文摘Background. Uterine Mullerian adenosarcoma (UMA) is a rare and low- grade variant of mixed mesodermal tumor. UMA recurrences including heterologous sarcomatous elements are extremely rare, with only 3 cases reported thus far. Case. We present a case of UMA recurring as heterologous sarcoma three times in 8 months for 9.4 years after primary treatment. The number and grade of sarcomatous components increased with each recurrence eventually resulting in loss of the patient. Conclusion. The presence of multiple sarcomatous elements of high histological grade in the recurrent tumor following UMA may indicate an unfavorable prognosis with common recurrences and fatal outcome. All UMA patients carry risk of late recurrence, therefore, they should receive long- term follow- up.
基金Project (2009ZM0264) supported by the Fundamental Research Funds for the Central Universities,China
文摘The dissimilar friction stir welding of pure copper/1350 aluminum alloy sheet with a thickness of 3 mm was investigated. Most of the rotating pin was inserted into the aluminum alloy side through a pin-off technique, and sound welds were obtained at a rotation speed of 1000 r/min and a welding speed of 80 mm/min. Complicated microstructure was formed in the nugget, in which vortex-like pattern and lamella structure could be found. No intermetallic compounds were found in the nugget. The hardness distribution indicates that the hardness at the copper side of the nugget is higher than that at the aluminum alloy side, and the hardness at the bottom of the nugget is generally higher than that in other regions. The ultimate tensile strength and elongation of the dissimilar welds are 152 MPa and 6.3%, respectively. The fracture surface observation shows that the dissimilar joints fail with a ductile-brittle mixed fracture mode durin~ tensile test.