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Chondromas springing from the pelvic bones usually arise in the region of the sacro-iliac joint; they project into the pelvis and press on the bladder and rectum, and on the sciatic and obturator nerves; sometimes also on the iliac veins, causing œdema of the legs. They are liable to take on malignant characters, and rarely lend themselves to complete removal by operation.
A recent example of the pygopagus type was Rosa-Josepha Blazek, born in Skerychov, in Bohemia, January 20, 1878. These twins had a broad bony union in the lower part of the lumbar region, the pelvis being obviously completely fused. They had a common urethral and anal aperture, but a double vaginal orifice, with a very apparent septum.
Under some circumstances, especially with a deformed pelvis, if pregnancy were allowed to proceed normally it probably would result in the death of the mother. Then, it is considered justifiable for the physician in charge of the case to produce an abortion in order to save the life of the mother. Those cases are rare and such a procedure never is undertaken except in extreme cases.
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