DEPARTMENT OF SURGERY. 
623 
condition cannot be ascertained to a certainty without surgical 
interference it is advisable to proceed as in Caesarian operation. 
6. Extra-uterine Pregnancy. —In this form of pregnancy 
the foetus is developed outside of the uterus. There are several 
varieties of this form of pregnancy and they are generally named 
according to their location. Dr. Fleming, in his work on ob¬ 
stetrics, gives a thorough classification of extra-uterine pregnancy 
and carefully describes each form ; but for our purpose we shall 
not study them so minutely, but will consider the following 
classes, viz.: 
(a) Abdominal pregnancy. 
(b) Ovarian pregnancy. 
(V) Tubal pregnancy. 
(d) Interstitial pregnancy. 
(a) Abdominal Pregnancy is that form of gestation which is 
characterized by the development of the foetus outside of the 
uterus and in the abdominal cavity. The symptoms of this 
form of pregnancy are varied, modified and often misleading. In 
the early development of the foetus and while the foetus is still 
alive, surrounded by the fluid enclosed in the foetal membranes, 
the abdomen may appear distended, as in intra-uterine gesta¬ 
tion ; but, when the foetus is dead and the fluids are absorbed, 
the abdominal distension may appear only in the region of the 
foetus, which may appear round, and when manipulated convey 
the impression of being a large indurated mass more or less 
axed. This condition is not very common in large animals, 
but is found frequently in dogs and pigs ; and should the con¬ 
dition interfere with the function of the viscera or impair the 
health of the animal, it should be removed. 
C b ) Ovarian Pregnancy. —It is sometimes very difficult to 
determine whether the foetus is located in the ovary (Fig. 29-8) 
ar the abdominal cavity outside of the ovary. As it develops 
its weight causes the ligament of the ovary to elongate and 
allow the embryonic structure to descend as far as if outside of 
die ovary ; but even if the condition cannot be determined, it 
should be treated as in abdominal pregnancy. 
(?) Tubal Pregnancy. —In this form of pregnancy the ovum 
s developed in the Fallopian tubes (Fig. 29-10). When the 
ivutn is developed in the tubes its enlargement prevents it from 
entering into the uterus and sooner or later it will cause some 
listurbance which will require its removal. 
(d ) Interstitial Pregnancy .—This form is characterized by 
die development of the ovum in the interstitial tissue between 
