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IntroductionPrimary retroperitoneal mucinous cystadenoma is a rare tumor prevailing specifically in female gender. Its histogenesis is still unclear and its diagnosis is mainly based on morphological characteristics.Case presentationthe subject is a 44 years old man presenting an abdominal pain on the right side, with a palpable mass which appeared four months ago. Abdominal ultrasound (echography) revealed a retroperitoneal cystic process, which was successfully resected through laparotomy.Histopathological examination concluded to a mucinous cystadenoma with borderline malignancy foci.After a year of follow-up, no relapse was noticed in this patient.ConclusionRetroperitoneal mucinous cystadenoma is a rare tumor that should be considered in front of a retroperitoneal cystic process. Several hypotheses may explain the histogenesis of this pathological process.The interest in publishing this case report on primary retroperitoneal mucinous cystadenoma in a male patient lies in the rarity of occurrence of this syndrom in males as compared to females.

Metastasis of BCC is a very rare condition that should not be overlooked. The prognosis remains very poor. We emphasize the importance of long-term follow-up of such patients.

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