ABSTRACT
Cystic renal masses are commonly encountered in daily clinical practice. Improvements in the resolution of imaging modalities have led to an improved ability to detect cystic renal masses. It is important for radiologists to recognize and appropriately characterize cystic renal masses. Since 1986, the Bosniak classification system has been widely accepted for the evaluation of cystic renal masses, portions of which have been revised in 2019. Although the Bosniak classification system cannot fully differentiate aggressive lesions from indolent lesions, the system may help improve the specificity of detection for higher-risk classes for malignancy, increase the proportion of masses that are surveilled or ignored rather than resected, and select optimal management strategies.
ABSTRACT
Solitary fibrous tumors (SFTs) are a unique group of soft tissue tumors originating from fibroblastic or myofibroblastic tissue. SFTs rarely occur in the liver, with less than 30 cases reported in the literature. We report a case of SFT of the liver presenting unique imaging features on CT and MRI. A 52-year-old woman presented with an incidentally detected hepatic mass that showed homogeneous strong enhancement, starting from the arterial phase until the delayed phase images on CT. On the T2-weighted MR image, the mass was heterogeneously hyperintense with multifocal hypointense dots and bands within the mass. The mass was microscopically characterized by bland-looking, ovoid to spindle shaped cells with stromal and perivascular hyalinization. Immunohistochemical studies showed reactivity for CD34.