A physical exam is typically the easiest way to diagnose it. Rarely, a tissue biopsy or imaging may be required. The imaging modality of choice is magnetic resonance imaging (MRI) because it has superior sensitivity of distinguishing it from<unk> rcoma as well as mapping the surrounding anatomy. File:Lipoma 05.X-ray of a<unk>  File:Ultrasonography of a<unk> .Medical ultrasonography of a<unk>  in the thenar eminence: It is hyperechoic compared to adjacent muscle, and relatively well-defined, with miniature hyperechoic lines. File:T1 MRI of thenar intramuscular<unk> .T1 MRI of the same<unk> : High intensity signal mass with regions of ill-defined margins. File:Scrotal ultrasonography of<unk> rcoma.Ultrasonography of a<unk> rcoma for comparison: In this case a heterogeneous mass consisting of an upper hyperechoic portion, corresponding to<unk> tous matrix, and areas of hypoechogenicity corresponding to nonlipomatous components. File:Scrotal ultrasonography of<unk> rcoma mimicking a<unk> .Ultrasonography of a<unk> rcoma mimicking<unk> . A homogeneous hypoechoic mass presenting with the same appearance of<unk> . It was clinically distinguished by having rapid growth. File:Arm mri.MRI showing<unk>  of the arm File:Medical X-Ray imaging TPH07 nevit.X-ray showing<unk>  File:Lipoma illness.jpg File:Histopathology of<unk> .Histopathology of a<unk> : The mass is composed of lobules of mature white adipose tissue divided by fibrous septa containing thin-walled capillary-sized vessels. H&E stain. File:Histopathology of an atypical<unk> tous tumor or well-differentiated<unk> rcoma,<unk> -like subtype.Histopathology of the major differential diagnosis of a well-differentiated<unk> rcoma,<unk> -like subtype: It looks identical at low magnification, but a high magnification of a fibrous band shows spindle cells with enlarged, hyperchromatic nuclei. H&E stain. File:Osseous formation in a well-differentiated<unk> rcoma.Bone formation may be seen in both<unk> s and<unk> rcomas (a well-differentiated one pictured)
Lipoma
Liposarcoma
Askin's tumor
Lipomatosis
Breast cyst
Hibernoma
Condyloma
Teratoma