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KMID : 0361820060250040179
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Journal of the Korean Society of Medical Ultrasound
2006 Volume.25 No. 4 p.179 ~ p.184
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US Diagnosis of Mature Cystic Teratomas of the Ovary:Morphologic Analysis of 112 Pathologically Proven Cases
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Abstract
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Purpose: To establish the morphologic US classification of mature cystic teratoma of the ovary and document the reliable sonographic features in the diagnosis of this neoplasm.
Materials and Methods: The study subjects comprised 103 patients with 112 pathologically proven, mature cystic teratomas. All patients underwent preoperative pelvic US in transabdominal and/or transvaginal approach. One radiologist retrospectively analyzed the US findings and the tumors were classified into 6 groups based on the morphologic US features. For each tumor, additional US findings, including posterior sonic shadowing, fat-fluid level and vascularity, were also evaluated.
Results: The common US patterns were hyperechoic area within a cyst (type IV; 36 tumors,32.1%), solid and cystic mass (type V; 32 tumors, 28.5%), and a diffusely hyperechoic mass (type VI; 25 tumors, 22.3%). All solid and cystic masses (type V) showed hyperechogenicity in at least one solid portion, resulting in hyperechogenicity within a mass being seen in 93 of the 112 tumors (83.0%), with pure cystic masses (types I-III) accounted for the remaining 19 tumors (17.1 %). Of the 112 tumors, 68 (67.1%) showed posterior sonic shadowing which was demonstrated only in the hyperechoic area of types IV-VI.
Conclusion: Any adnexal masses representing a hyperechoic area within a cyst, solid and cystic tumors containing hyperechogenicity or diffusely hyperechoic mass, especially when accompanied by posterior sonic shadowing, should be suspected as indicative of mature cystic teratoma.
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KEYWORD
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Ovary, neoplasms, Ultrasound(US)
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