DIFFERENTIATION.—Hæmatocele may be confounded with pelvic cellulitis or abscess, retroversion, extra-uterine pregnancy, fibroid tumor, and dislocated ovarian cyst.

The tumor of cellulitis develops slowly, with great pain; is hard at first, and then softens; is tender from the first; does not elevate the uterus or press it forward; and is not often accompanied by metrorrhagia.

Retroversion will readily be detected by the uterine sound, conjoined manipulation, and the absence of anæmic symptoms.

The development of extra-uterine pregnancy is slow and gives the signs of gestation.

Fibrous tumors grow slowly, are painless, and move with the uterus, and they are hard, irregular, and do not lift the uterus against the symphysis.

Displaced cysts are painless, non-hemorrhagic, cause no metrorrhagia, and yield fluctuation readily to palpation.

COMPLICATIONS.—The complications to be feared in this disease are septicæmia, suppuration and abscess, and peritonitis.

COURSE, DURATION, AND TERMINATION.—The hemorrhage may be so severe as to destroy life immediately. Five such instances have been recorded by Voisin; I have met with one; and Ollivier d'Angers mentions two in which death occurred in half an hour from a varicose utero-ovarian vein. Such a termination is, however, very rare.

As a rule, absorption takes place unaided by art; in some cases suppuration occurs, and the mass is discharged as if it were a large abscess by the vagina, rectum, bladder, or abdominal walls; and at other times septic absorption, accompanied by septic peritonitis, destroys the life of the patient.

PROGNOSIS.—The prognosis will depend in great degree upon the severity of the constitutional symptoms. As a rule, it is decidedly favorable unless the surgical tendencies of the attending practitioner alter its natural inclination. The prognosis of the peritoneal form is graver than that of the subperitoneal, and when the tumor is very large the danger is greater than when it is small. A large tumor argues great loss of vital fluid, which may in itself destroy life, and the necessity for the absorption of a large amount of coagulated material which may poison the blood.