The author has reported a case of spontaneous myospherulosis which developed adjacent to a benign cystic ovarian teratoma which was discovered by routine ultrasound examination in a young patient admitted for spontaneous abortion. This ovarian cyst had not been aspirated before. This report demonstrates that myospherulosis can be induced spontaneously by necrosis of fatty tissues. Up to now, this lesion was considered iatrogenic. In this case, it resulted from a physical process similar to the emulsion phenomenon between intra-tissular free fatty materials and plasma. This process gives rise to sequestration of blood cells, in particular erythrocytes by free fatty materials with the formation of "bags of marbles". These saccular structures thus produce inflammatory changes with foreign body granuloma and pseudo-cystization.