Q.

Perforation tends to occur earliest when an ectopic pregnancy is located in which portion of fallopian tube ?

A. Isthmic
B. Interstitial
C. Ampullary
D. Infundibular
E. No difference
Answer» A. Isthmic
Explanation: If the implantation is located in the narrow isthmic portion of the tube(the narrowest part), it will rupture very early, within 6 to 8 weeks; the distensible interstitial portion may be able to retain the pregnancy up to 14 weeks of gestation, while the ampulla is the widest portion.

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