Sclerosing stromal tumor of the ovary

Sclerosing stromal tumor (SST) of the ovary is a rare ovarian neoplasm. It is considered a subtype of ovarian sex cord / stromal tumor and is included in the fibroma-thecoma group of ovarian tumors .


It occurs predominantly in young women and its incidence peaks around the 2 to 3 decades of life .

Clinical presentation

Patients may have menstrual irregularity and/or pelvic pain . It is usually hormonally inactive, but it may occasionally have an oestrogenic effect (even more rarely an androgenic effect).


It is histologically characterized by cellular heterogeneity, prominent vasculature, and a pseudolobular appearance composed of cellular and hypocellular areas. They generally tend to be unilateral .

Radiographic features 


Described sonographic features (whilst being nonspecific) include tumor with multilocular cystic components and irregularly thickened septa and tumor walls or a solid tumor including several small cystic components .

Pelvic MRI

Described signal characteristics include :

  • T2
    • signal intensities of the cystic components are high and those of the solid components were inhomogeneous, ranging from intermediate-high to high
    • MR may show pseudolobulation of the lesion which consists of low-intensity nodules set against high-intensity stroma on T2-weighted images
  • T1 C+ (Gd): dynamic imaging may show marked early enhancement of the solid components

Differential Diagnosis

See also