Abstract:Objective This study aimed to investigate CT and MR imaging features of alveolar soft part sarcoma (ASPS) were investigated. Methods This was a cross-sectional study. The imaging data of 11 patients with ASPS confirmed by surgery and pathology in the First Affiliated Hospital of Xi'an Jiaotong University from January 2012 to January 2022 were retrospectively analyzed. The patients included four males and seven females, aged 20-52 (30.5±13.2) years. Among them, five patients underwent CT scan, five patients underwent MR scan (including one case scanned by enhanced MR at the same time), and one patient underwent CT and MR scans. The CT and MRI imaging features of ASPS such as the tumor location, shape, size, boundary, CT value, MR image signal characteristic and soon were summarized. Results The tumors were located in the left rectus femoris in four cases, left vastus intermedius in one case, right vastus intermedius in one case, right quadriceps femoris in one case, left upper extremity deltoid in one case, and left retroperitoneum in three cases. Nine cases were oval, one case was round, and one case was irregular. The maximum diameter of the tumor ranged from 4.7-11.1 (9.1±2.3) cm. The boundaries of the lesions were clear in nine cases, and the upper and lower edges of the lesions were unclear in two cases. The CT imaging features showed slightly low and uneven densities in six lesions, and the average CT value was 26-38 (35.0±4.3) HU. Punctate calcification was found in one lesion. As for the MRI imaging features, the T1WI MRI scan showed isointensity in two cases and slightly hyperintensity in four cases and uneven hyperintense in six cases. All showed cases shoed low signal empty vascular shadows in and around the lesions. The contrast-enhanced MRI of one case showed obvious and uneven enhancement. Conclusion ASPS is more common in the muscles of the limbs. CT shows uneven low density, and MRI shows specific signs: equal signal or slightly hyperintensity on T1WI, uneven hyperintensity on T2WI, low signal empty vascular shadows in and around the lesions, and obvious enhancement on enhanced MRI. Familiarity with the CT and MRI imaging features of ASPS can help radiologists and clinicians to diagnose and operate.
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