Zacutus Lusitanus relates the history of a case of uterine occlusion, with the flow from the lips of the cervix.

There is mentioned an instance of menstruation from the labia.
The occurrence of menstruation after removal of the uterus or ovaries is frequently reported.

Storer, Clay, Tait, and the British and Foreign Medico-Chirurgical Review report cases in which menstruation took place with neither uterus nor ovary.

Doubtless many authentic instances like the preceding could be found to-day.

Menstruation after hysterectomy and ovariotomy has been attributed to the incomplete removal of the organs in question, yet upon postmortem examination of some cases no vestige of the functional organs in question has been found.
Hematemesis is a means of anomalous menstruation, and several instances are recorded.