alexa Lipomas, lipoma variants, and well-differentiated liposarcomas (atypical lipomas): results of MRI evaluations of 126 consecutive fatty masses.
Dermatology

Dermatology

Journal of Clinical & Experimental Dermatology Research

Author(s): Gaskin CM, Helms CA

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Abstract OBJECTIVE: Our objectives were to evaluate the reliability of MRI in distinguishing simple lipomas, lipoma variants, and well-differentiated liposarcomas (atypical lipomas) and to identify various imaging mimics of well-differentiated liposarcoma. MATERIALS AND METHODS: One hundred twenty-six consecutively imaged grossly fatty masses were retrospectively reviewed. MRI examinations, their prospective interpretations, and their corresponding pathology reports were compared to determine the reliability of MRI in distinguishing simple lipomas, lipoma variants, and well-differentiated liposarcomas. RESULTS: The success of MRI in identifying well-differentiated liposarcomas among other fatty masses was as follows: sensitivity, 100\%; specificity, 83\%; accuracy, 84\%; positive predictive value, 38\%; and negative predictive value, 100\%. MRI was 100\% specific in the diagnosis of simple lipoma. Sixty-three percent of lesions considered suspicious for well-differentiated liposarcoma were actually simple lipomas (13\%) and benign lipoma variants (50\%), including chondroid lipoma (13\%), osteolipoma (6\%), hibernoma (6\%), lipoleiomyoma (6\%), angiolipoma (6\%), and infarcted lipoma (13\%). CONCLUSION: Because of differences in treatment, prognosis, and long-term follow-up, it is important to preoperatively distinguish simple lipomas from well-differentiated liposarcomas. MRI is highly sensitive in the detection of well-differentiated liposarcomas and highly specific in the diagnosis of simple lipomas. However, when an extremity or body wall lesion is considered suspicious for well-differentiated liposarcoma, it is more likely (64\%) to represent one of many benign lipoma variants. This article was published in AJR Am J Roentgenol and referenced in Journal of Clinical & Experimental Dermatology Research

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