Decidualization of Ovarian Endometriosis During Pregnancy Mimicking Malignancy

Objectives The purpose of this series is to present deciduosis (the formation of extrauterine decidua) as one of the differential diagnoses of a malignant tumor during pregnancy. Methods Two cases are described in which pregnant patients had a pelvic tumor. The lesions, which were diagnosed in the e...

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Bibliographic Details
Published in:Journal of ultrasound in medicine 2005-09, Vol.24 (9), p.1289-1294
Main Authors: Sammour, Rami N, Leibovitz, Zvi, Shapiro, Israel, Degani, Shimon, Levitan, Zohar, Aharoni, Ariel, Tal, Joseph, Lurie, Michael, Ohel, Gonen
Format: Article
Language:English
Subjects:
Adult
Decidua - diagnostic imaging
Decidua - pathology
Decidua - surgery
deciduosis
Diagnosis, Differential
endometriosis
Endometriosis - diagnostic imaging
Endometriosis - pathology
Endometriosis - surgery
Female
Humans
Laparoscopy
ovarian neoplasm
Ovarian Neoplasms - diagnostic imaging
Ovarian Neoplasms - pathology
Ovarian Neoplasms - surgery
Pregnancy
Pregnancy Outcome
Pregnancy Trimester, Second
Ultrasonography
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Summary:Objectives The purpose of this series is to present deciduosis (the formation of extrauterine decidua) as one of the differential diagnoses of a malignant tumor during pregnancy. Methods Two cases are described in which pregnant patients had a pelvic tumor. The lesions, which were diagnosed in the early second trimester, consisted of complex masses with an extensive blood supply and had a sonographic appearance of a malignant tumor. The high suspicion for malignancy necessitated surgical intervention. Results During surgery, the lesions were observed to be of an ovarian origin with papillary excrescences covering their exterior. The lesions were excised and sent for histologic examination. The results showed a markedly decidualized endometriotic cyst in both cases. Conclusions This phenomenon is a diagnostic challenge and should be considered in the differential diagnosis of a malignant mass during pregnancy.
ISSN:0278-4297
1550-9613
DOI:10.7863/jum.2005.24.9.1289