What characteristic of MRI signals is expected for soft tissue tumors like plantar fibromas?

• A. High T1 signal
• B. High T2 signal
• C. Low T1 and low T2 signal
• D. Variable depending on tumor type

Answer: (C)

For soft tissue tumors such as plantar fibromas, the characteristic expected is low T1 and low T2 signal. This reflects the intrinsic properties of the tumor tissue and its composition. Plantar fibromas, being fibrous tumors, typically exhibit lower signal intensity on both T1 and T2-weighted MRI sequences.

The T1-weighted images are particularly sensitive to fat and protein-rich tissues and will show lower signals in substances that have high cellularity or fluid content, such as these tumors. Similarly, T2-weighted images are sensitive to high water content, and although plantar fibromas can sometimes have areas of increased water content due to edema, their overall composition tends to lean towards low signal intensity.

Understanding the MRI characteristics of plantar fibromas is crucial for accurate diagnosis and differentiation from other soft tissue lesions, aiding in appropriate treatment planning. Therefore, the identification of low T1 and T2 signals helps clinicians to recognize these tumors in imaging studies effectively.