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11%) and severe complications (12.44%) when compared with other shapes (χ2 = 11.149 and P = 0.001; χ2 = 5.901 and P = 0.015, respectively). Spindle shape was an independent risk factor for poor prognosis, and contributed a more clinical risk than the pin shape. In conclusion, clinical features, management, perforation rate, and severe complications differed based on EFB shape. The EFBs with two pressure points, especially the spindle-shaped EFBs, were more dangerous compared with those with more pressure points.Recent studies on mass