Retropubic parasymphyseal cyst: A rare entity

Abstract

We report a case of a retropubic parasymphyseal cyst in a 69-year-old multiparous female with a protracted history of metastatic small bowel carcinoid (neuroendocrine) tumor. Cysts related to the pubic symphysis are uncommon, and mostly reported in subpubic location. They may be confused with primary vulvar masses, malignant bone tumors or metastatic disease. In our case, encapsulation, lack of solid components or diffusion restriction, communication with the symphysis, lack of activity on Gallium-68-Dotatate PET/CT and signal characteristics on MRI similar to those previously reported in literature for subpubic cysts all aided in eventual diagnosis. We aim to remind the reader of this rare entity and its distinguishing features on imaging.

Keywords

• Retropubic cyst
• Cartilaginous cyst
• Pubic symphysis