OBJECTIVE: Germ cell @entity5 are the most common @entity43 in childhood and, of these, @entity44 , whether mature or immature, are the most frequently found. @entity44 is a @entity5 , whereas the immature type, although also benign, has a more aggressive course, with a propensity to recurrence. A review of the literature revealed that there are some imaging features that may help to differentiate between these 2 types of @entity44 , although no systematic comparison has been made. The objective of this study was to review imaging features of @entity43 in @entity1 and to assess differentiating imaging features between the mature and immature types of @entity43 . METHODS: Retrospective analysis of all @entity1 who presented to our institution during a 9-year period (September 1999 to August 2008) with @entity43 as confirmed on histology. RESULTS: Forty-one @entity1 with pathologically proven @entity43 were found. The @entity1 ages ranged from 4-18 years at presentation (mean [standard deviation] age, 12.4 +/- 3.4 years; median age, 13 years). Thirty @entity1 (73.2%) were found to have @entity43 , and 11 (26.8%) had @entity44 . A component of @entity5 was found in one of the @entity44 . On ultrasonography, the appearance of the @entity44 was purely solid in 3 (27.3%), mixed solid and cystic in 6 (54.5%), and predominantly cystic in 2 (18%). The mature @entity43 demonstrated a predominantly cystic appearance in 22 (73.3%) and a mixed solid and cystic appearance in 8 (26.6%); there were no cases with a pure solid appearance. The prevalence of the more cystic appearance of the mature type showed significant statistical difference when compared with its prevalence in the immature type (P = .0008, chi(2) test). Other imaging features, such as size, presence of fat, or @entity730 , did not show a significant difference between the 2 types of @entity44 . CONCLUSIONS: The predominance of a cystic component and a pure solid component in @entity43 are significant differentiating factors between the mature type and the more aggressive immature type of @entity44 .

Imaging of @entity43 in XXXX : a 9-year review.

@entity1 :: ('9606', 'Species') :: ['children', 'patients', 'patient'] @entity43 :: ('MESH:D010051', 'Disease') :: ['ovarian teratoma', 'ovarian teratomas', 'mature ovarian teratoma', 'ovarian neoplasms'] @entity5 :: ('MESH:D009369', 'Disease') :: ['endodermal sinus tumour', 'benign tumour', 'tumours'] @entity730 :: ('MESH:D002114', 'Disease') :: ['calcifications'] @entity44 :: ('MESH:D013724', 'Disease') :: ['teratoma', 'immature teratoma', 'Mature teratoma', 'teratomas', 'immature teratomas']
@entity1 :: (9606,Species) :: ['children']
