Tailgut duplication cyst
MRI was done for assessment of left ovarian cysts.
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A bilocular cyst is noted in the pre-sacral retro-rectal concavity, separable from both ovaries. It measures 10 x 9 x 8.5 cm in its maximal AP, side to side and cephalocaudal dimensions respectively. It shows homogeneous fluid signal with no solid components and internal septation.
The cyst exerts mass effect upon adjacent pelvic structures. It compresses and displaces the rectum to the right side, the uterus, vagina and the urinary bladder anteriorly and superiorly.
Multilocular left ovarian cyst is noted, measuring 6.5 cm, with no suspicious features (functional cyst).
The diagnosis of tailgut duplication cyst was based on the classic features of fluid filled cyst found in the retrorectal/ presacral space with internal septation which are characteristic. It can be asymptomatic or present with perirectal symptoms.
Differential diagnosis includes epidermoid cyst, dermoid cyst, rectal duplication cyst, anal gland cyst, cystic lymphangioma and anterior meningocele. Distinction of tailgut cyst and other presacral cysts is important because of the malignant potential of tailgut cyst