E2683. MRI Characterization of T1W Hyperintense Osseous and Soft Tissue Lesions
  1. Muhammad Israr Ahmad; The University of British Columbia
  2. Adnan Sheikh; The University of British Columbia
Different soft tissue and osseous lesions can have variable signal intensity on different sequences in MRI depending on the nature of the lesion and its contents. MRI can play an important role to differentiate the lesions according to their signal characteristics and therefore narrow down the differential and help in directing further steps of investigation and treatment.

Educational Goals / Teaching Points
To review the MRI features related to the osseous and soft tissue lesions which are high signal intensity on T1-weighted sequence and to demonstrate how MRI can play an important role on differentiating and characterizing these lesions on the basis of the T1 high signal intensity.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
Labeling the lesion as having T1 high signal intensity depends on the refence signal intensity, which usually is considered as skeletal muscle or intervertebral disc. Some lesions are significantly higher as compared to the reference signal due to the higher internal fat and others are higher than the standard reference but lower than the subcutaneous fat. The differential of these lesions includes intraosseous lipoma, hemangioma, osteonecrosis, Paget's disease, bone infract, post-radiation changes. The differential for soft tissue lesions includes lipoma, liposarcoma, hematoma, hemorrhagic metastatic deposit, and melanoma.

This exhibit will help getting familiar with the common T1-weighted high signal intensity osseous and soft tissue lesions which can be characterized depending upon the level of high signal intensity as compared to the subcutaneous fat and skeletal muscles in addition to the anatomical location. MRI can help differentiation these lesions and therefore unnecessary interventions can be prevented.