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Woman 45 yo, PARA 2002, normal spontaneous vaginal deliveries,no cesarean operation nor history of hormonal contraception.
2 years ago she detected her umbilicus swelling some days before her menses and continuous pain during the entire of her period in some times bleeding.
In clinical examination the umbilicus deformed by one mass which were bluish-black, hard and not hot (see 2 photos).
Ultrasound findings of this mass=
US1: this mass was well bordered, localized intra cavity of navel. Structure of mass was solid, size of 2.68 cm.
US 2: in CDI, vascular supplying was from peripheral part of mass.
US 3: in elastography: this mass was hard in comparison to muscle.
US 4 : uterus and pelvis were nothing abnormal.
What is your suggestion for diagnosing of this case.