Schwartz Z, Katz Z, Lancet M, Bernstein D
Int J Gynaecol Obstet. 1986 Oct;24(5):383-4. doi: 10.1016/0020-7292(86)90160-8.
A demonstration of patent tube usually excludes the presence of tubal pregnancy. In the reported case tubal patency was demonstrated by hysterosalpingography in the presence of 6 weeks tubal pregnancy.