The correlation between smoking and this condition may be explained (-5[1])by the fact that cigarette smoke opposes PROKR1 expression. The "blob" and "bagel" signs are indicators of this condition, while an absence of this condition is indicated by the intradecidual and double sac signs. It's not arthritis or cancer, but injection of hypertonic potassium chloride with methotrexate is used to treat this condition. Neither this condition nor its less life-threatening counterpart can be visualized by ultrasound in a situation (15[1])abbreviated (*) PUL. Both this (10[1])condition and appendicitis can cause right lower quadrant pain, so a hCG test is usually performed to differentiate them. This condition is the most common cause of death during the first trimester, and if untreated, can cause tubular rupture. For 10 points, name this condition which occurs when the fetus implants outside of the uterus. (10[1])■END■