ARRS 2022 Abstracts

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E1229. Can You Feel That? Important Features of Soft Tissue Masses on Superficial Ultrasound
Authors
  1. Thanh-Lan Bui; Department of Radiological Sciences, University of California, Irvine
  2. Daniel Kwan; Department of Radiological Sciences, University of California, Irvine
  3. Justin Glavis-Bloom; Department of Radiological Sciences, University of California, Irvine
  4. Ngoc Le; Department of Radiological Sciences, University of California, Irvine
  5. Parth Kumar; Department of Medicine, University of California, Irvine
  6. Roozbeh Houshyar; Department of Radiological Sciences, University of California, Irvine
  7. Mohammad Helmy; Department of Radiological Sciences, University of California, Irvine
Background
Superficial soft tissue masses are a common clinical entity. Benign soft tissue tumors have an annual incidence of up to 3000 per one million people and outnumber malignant soft tissue tumors by 100-fold. The World Health Organization classifies soft tissue masses based on the type of cell of origin: adipocytic, skeletal muscle, smooth muscle, fibroblastic, fibrohistiocytic-like, vascular, pericytic, chondrosseous, gastrointestinal stromal tumors, and nerve sheath lesions. Soft tissue masses can also be classified by depth (e.g., cutaneous, subcutaneous, fascial). The treatment and prognosis of superficial soft tissue masses depends on the histologic type and extent. Managing patients with soft tissue masses can be challenging because of the need to avoid unnecessary evaluation of benign pathologies while still identifying the small number of malignant pathologies. Ultrasound is often the first line imaging for soft tissue masses because it is an easy, inexpensive imaging modality with high accuracy in differentiating tissue layers, good spatial and contrast resolution, and real-time imaging capability. Radiologists need a strong understanding of the ultrasound appearance of soft tissue lesions to accurately diagnose these common lesions.

Educational Goals / Teaching Points
This exhibit aims to comprehensively review ultrasound findings for superficial soft tissue masses using representative cases. For each case, we will provide a series of ultrasound images accompanied by annotations explaining the key imaging findings that will assist the reading radiologists in confirming superficial location, determining the specific tumor type, and excluding malignancy.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
We will be discussing key imaging findings on ultrasound imaging of a variety of superficial soft tissue masses. Superficial soft tissue lesions can be categorized by anatomic location (extremity, trunk, head and neck) and depth (subcutaneous, cutaneous, facial). Ultrasound allows for rapid imaging and diagnosis of superficial soft tissue masses. To accurately characterize the lesion, the tumor must show specific ultrasound imaging features and the reading radiologist must be aware of these features. In addition, the use of color Doppler and real-time compressibility can assist in the characterization of superficial soft tissue masses. Recognition of a specific tumor type on ultrasound enhances management by assisting in the decision about the need for percutaneous biopsy or additional imaging such as MRI.

Conclusion
Ultrasound is the preferred imaging modality to quickly and accurately diagnose superficial soft tissue masses. Reading radiologists need to be familiar with common diagnoses for soft tissue lesions and associated ultrasound findings to ensure accurate diagnosis and prompt treatment of these common lesions.