An intriguing story of a strange cyst

This right ovary showed a cyst on transabdominal ultrasound:

A simple cyst or something more to it?

Color Doppler ultrasound image showed no internal vascularity. Few vessels around it. But observe the solid area to the right. Could it be an intramural nodule or debris? Could it be a clot from internal hemorrhage?

So we did an endocavity TVS scan.

TVS scan showed internal debris and typical fibrinous strands. Few vessels around the rim on color Doppler ultrasound again.

Final diagnosis: 

Hemorrhagic cyst ovary.

Have advised follow up ultrasound after 4 weeks. Hemorrhagic cyst should resolve.