摘要：Primary umbilical endometriosis is a rare phenomenon accounting for 0,4-1,0% of extragenital
endometriosis. Despite the fact that it mostly presents as a typical cyclic umbilical discharge
coincidental with a palpable mass, the diagnosis is often delayed due to its low prevalence, as
was seen in the presented case. The exact pathogenesis is still unclear. The golden standard
for diagnosis is histopathological examination, but diagnostic tools like ultrasound, MRI or
CT scan can be helpful. The differential diagnosis includes a wide range of disorders. Surgical
management is the preferred treatment.
