Pros: 1  Produces high-quality stitches through multiple layers of fabric. 2  Easy buttonhole set-up. 3  Easy to thread the machine and wind the bobbin. 4  Easy to change the needle and presser foot. 5  Simple, straightforward sewing machine. 6  Very easy-to-use dials.
Beermann E, Lagasy M, van Houhuys J, et al: Familial varices of the colon. Nikolopoulos N, Xynos E, Datsakis K, et al: Varicosis coli totalis: report of a case of idiopathic aetiology. Iredale J, Ridings P, McGinn F, et al: Familial and idiopathic colonic varices: an unusual cause of lower gastrointestinal haemorrhage.
Venous valves are still discussed controversially, mainly because it is still uncertain whether primarily missing or insufficient valves or the weakness of the venous walls cause varices.