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Arch Surg. 2007;142(11):1106.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Answer: Benign Retroperitoneal Cyst

Although much less common, primary retroperitoneal processes must be considered along with lesions of appendiceal or ovarian origin when considering the differential diagnosis of cystic masses in the right lower quadrant. Cystic masses of the retroperitoneum are uncommon clinical entities. The differential diagnosis is broad and includes lesions of a possible neoplastic origin, such as cystic lymphangioma, cystic teratoma or dermoid tumor, mucinous cystadenoma or cystadenocarcinoma, endometriosis, cysts of mesonephric duct remnants (such as Müllerian cysts), bronchogenic cysts, and epidermoid cysts. Other nonneoplastic cystic lesions, such as pancreatic pseudocysts, urinoma, hematoma, or infectious cysts (such as hydatid cysts), may also be found in the retroperitoneum. Computed tomography along with clinical features may help distinguish between different types of lesions.¹

In this case, pathologic analysis revealed a mass measuring 11 x 7 x 2.5 cm (Figure 2A). There was a smooth pink-tan lining and the cyst was filled with . . . [Full Text of this Article]

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Arch Surg. 2007;142(11):1105.
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