- Epithelial neoplasms: Mucinous cystadenoma or cystadenocarcinoma, serous cystadenocarcinoma, perianal mucinous cystadenocarcinoma (rare, associated with history of anal fistula).
- Mesothelial neoplasms: Mesothelioma.
- Germ cell neoplasms: Cystic teratoma.
- Neuroendocrine neoplasms: Paraganglioma.
- Neural neoplasm: Schwannoma.
- Sarcoma: Necrotic areas can appear cystic.
- Lymphovascular: Lymphangioma, lymphangiomatosis, lymphangioleiomyoma.
- Developmental: Müllerian cyst, epidermoid cyst, tailgut cyst, bronchogenic cyst (subdiaphragmatic location).
- Miscellaneous fluid collections: Hematoma, urinoma, abscess, lymphocele (shown above in a patient with testicular cancer, post lymph node dissection), pseudocyst (pancreatic, and nonpancreatic), pseudomyxoma retroperitonei (caused by a ruptured mucocele of the appendix).
References
Rajiah P, Sinha R, Cuevas C, Dubinsky TJ, Bush WH Jr, Kolokythas O. Imaging of uncommon retroperitoneal masses. Radiographics. 2011 Jul-Aug;31(4):949-76.
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.