system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Halban disease is due to
assistant
The correct answer is  Irregular shedding (Halban's disease)
It is rare and self-limited. It is due to persistent corpusluteum. The menstruation comes on time, is prolonged but not heavy. Progestogen can suppress the bleeding, but needs to be taken on tapering dose for 20 days to complete the cycle.