Abstract
Lipomas are common mesenchymal neoplasms, usually occurring in the subcutaneous tissues of the extremities and trunk and less commonly occur within deeper tissues such as the retroperitoneum. Although fat is abundant in the orbit, lipomas and related variants (such as fibrolipoma, spindle cell lipoma, and angiolipoma) are rare in the orbital region, usually presenting as a well- circumscribed benign mass arising mainly from the anterior orbit [1,2,3]. Histologically they are composed of mature adipose tissue, lobulated and surrounded by fine capsule [1,4].
CT – Homogeneous, well-defined, low attenuation mass with fat density in Hounsfield units (range −50 to −150) and finely defined border. No calcifications or fluid-fluid levels. Long-term tumoral pressure may cause bone remodeling. MRI – Follows subcutaneous and intraorbital fat signal on T1 (hyperintense) and T2 (hypointense) weighted images with signal loss on fat-suppressed images.
Usually non-enhancing (significant enhancement, along with heterogeneity, hypervascularity, and rapid growth, raises concern for liposarcoma) [1,2,3,4,5].
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Ben Cnaan, R., Niry, D., Leibovitch, I. (2022). Orbital Lipoma. In: Ben Simon, G., Greenberg, G., Landau Prat, D. (eds) Atlas of Orbital Imaging . Springer, Cham. https://doi.org/10.1007/978-3-030-62426-2_29
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DOI: https://doi.org/10.1007/978-3-030-62426-2_29
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