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Table 1 Classification of lesions of the retroperitoneum as neoplastic and non- neoplastic

From: Mucinous cystadenoma of the retroperitoneum, laparoscopy or an open approach? Two case reports and review of the literature

Neoplastic

Cystic lymphangioma

Cystic teratoma

Cystic mesothelioma

Epidermoid cyst

Mucinous cystadenoma

Mucinous cystadenocarcinoma

Tailgut cyst

Perianal mucinous carcinoma

Pseudomyxoma retroperitonei

Urogenital cysts (pronephric, mesonephric, metanephric, Mullerian cyst)

Cystic lesion in solid tumors (paraganglioma, neurogenic tumor, gastrointestinal stromal tumor, soft tissue sarcoma, etc.)

Non-Neoplastic

Pseudocyst (pancreatic, non-pancreatic)

Urinoma

Hematoma

Lymphocele

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