World Federation for Ultrasound in Medicine Review Paper: Incidental Findings during Obstetrical Ultrasound

Although the prevalence of incidental findings revealed during an obstetric ultrasound examination is low, the findings may include adnexal and cervical masses, uterine or urinary congenital malformations, free fluid in the pouch of Douglas or tortuous vessels (varices). Adnexal masses are the most common finding and vary in imaging characteristics. They are mainly unilateral, cystic masses with a low risk of malignancy that are treated conservatively. The International Ovarian Tumor Analysis scoring models may be helpful in differentiating benign from malignant masses. For those masses >5 cm, follow-up is recommended, and resection could be considered to avoid risk of torsion, rupture and hemorrhage, which may compromise pregnancy outcome. Uterine masses such as fibroids are commonly diagnosed early in the first trimester and should be followed up during pregnancy to evaluate any changes. Transabdominal and transvaginal ultrasound is the first-line test for the diagnosis of such incidentalomas; however, magnetic resonance ultrasound may have a useful role in excluding malignancy potential. As a result of their low frequency and the lack of good evidence, there are no specific guidelines on the management of incidentalomas detected at obstetric scans. Their management should follow the related general guidelines for ovarian, cervical and uterine masses, with individualized management depending on the pregnancy status.

Ovarian cysts in pregnancy: a narrative review

Most adnexal masses are benign, incidental findings of pregnancy which resolve spontaneously. They may present clinically due to haemorrhage, rupture, torsion and mass effect. Aetiological classification includes ovarian benign, ovarian malignant, non-ovarian, gynaecological, non-ovarian non-gynaecological and an additional subset of pathologies unique to pregnancy. Ultrasound is the first-line imaging modality for the evaluation of adnexal masses. This may be supplemented with magnetic resonance imaging. Tumour markers support evaluation of malignant potential, but interpretation of results in pregnancy is challenging. Surgical intervention requires consideration of gestation, lesion characteristics and presence of complications. Laparoscopy is preferred owing to shorter operative time, quicker recovery and resultant lower thrombotic risk. Post-viability, fetal wellbeing and assessment must be considered. Management of the pregnancy may include cardiotocography, steroids, non-teratogenic antibiotics and tocolytics. In rare cases, particularly related to malignancy, termination of pregnancy may be required to enable immediate management where there are concerns for maternal wellbeing.

Management of adnexal masses in pregnancy: our experience from a tertiary referral perinatal centre in South India

PURPOSE

Adnexal masses in pregnancy are often incidentally detected during sonography and most resolve spontaneously by early second trimester. This study aimed to look at the prevalence and management of adnexal masses in pregnancy at a tertiary care referral perinatal hospital.

METHODS

This is a retrospective study of all women with adnexal masses (excluding ectopic gestations and non-gynaecological lesions) identified pre-pregnancy or during pregnancy (antepartum/intrapartum) from January 2006 to August 2013 at the study institute.

RESULTS

The study identified 252 women (0.6, 95 %, CI: 0.5, 0.7) with adnexal masses and mean (SD range) age of 27.1 (4.21, 18-39) years. Majority (80 %) of the masses were diagnosed incidentally. 170 (67.5 %) women were offered conservative management and cysts resolved in half of them. 87 (34.5 %) women had adnexal surgery and 15.1 % were operated during the antepartum period because of persistent abdominal pain or suspicious sonographic findings. Three (1.2 %) malignancies and five (2.0 %) borderline ovarian tumours were diagnosed on histopathological examination. 16 (6.3 %) women were lost to follow-up antenatally. Pregnancy carried to term in 175 (69.4 %) women. Perinatal mortality rate was 31.1/1,000 total births (caused by prematurity). Complications encountered were torsion (7.1 %), malignancy (1.2 %), rupture (0.4 %) and infection (0.4 %).

CONCLUSION

Although conservative management was appropriate in the majority of cases, the study identifies the need to standardize diagnosis, investigations and management for a better evaluation of outcomes.