Malignant transformation of a tailgut cyst

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COD: 2711_5_7_2017_EP Categorie: , ,

Gianrocco Manco, Giovanni Giliberti, Giovanni Rolando, Fabio Gelsomino,
Elena Zunarelli, Aldo Rossi

Ann Ital Chir, Digital Edition 2017, 6
Epub, July 5

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INTRODUCTION: Tailgut cyst are congenital cystic lesion arising from remnant of the embryological postnatal gut. Tailgut
cyst are multinodular, uncapsulated and usually well-circumscribed. Presacral cysts are rare in adult and most of the
lesions are benign. Malignant degeneration can occur, however is extremely rare.
CASE REPORT: We present the case of a 74 years old woman with slow increase in size and malignant degeneration of
a tailgut cyst. Five years before, during the follow up after mastectomy for cancer, she manifested rise of CA 19-9 tumor
marker and a presacral cystic collection on thoraco-abdominal CT. She was followed with CT and MRI that showed
that the cyst, with a solid component of the wall, was growing larger.
After a five-year evolution, the cyst was resected. The histological examination on the solid component demonstrated intestinal
adenocarcinoma.
CONCLUSION: MRI ant TC can play essential role in the preoperative detection and characterization for the differential diagnosis,
treatment strategies and evaluate neoplastic degeneration. Due to the risk of malignancy surgical resection must be performed
after the diagnosis. Surgical therapy is mandatory when the cyst grow larger and a solid component is present.

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