Presentation Description
Institution: St John of God Midland Hospital - Western Australia, Australia
Abstract
Background
Sarcomas guidelines suggest soft tissue lumps ≥5cm, enlarging, painful or deep are considered malignant unless proven otherwise, should undergo a MRI scan and be referred to a specialist centre. Secondary hospitals receive multiple referrers from primary care for subcutaneous, soft tissue lesions ≥5cm with no other high-risk features. Strict adherence to recommendations can lead to overutilisation of limited resources.
Methods
We performed a single centre, retrospective cohort study at SJOG Midland Hospital in Western Australia, Perth on 552 patients investigated for subcutaneous, soft tissue lesions from 24 November 2015 to 30 September 2024.
Results
83.5% (461/552) of lesions assessed to be overall low-risk were excised locally. 31.9% (147/461) had ≥1 high-risk clinical feature but none were atypical or malignant. Histological lipomas were the most common at 83.5% (385/461) followed by angiolipomas at 9.1% (42/461). 0.22% (1/461) lesion showed malignancy and was <5cm. Pre-operative ultrasound was most commonly utilised at 56.2% (259/461) with 95.3% sensitivity and 100% specificity for lipomas. MRI was the next most commonly used imaging at 19.1% (88/461).
16.5% (91/552) of lesions had radiological high-risk features. 54.9% (50/91) were managed at our state sarcoma unit. 84% (42/50) underwent excisions with 1 histological pleomorphic sarcoma which had typical clinical and imaging features of malignancy managed with wide excision.
Conclusion
99.8% (460/461) of patients with low-risk lesions <5cm were benign on histopathology. 50% (1/2) of subcutaneous, soft tissue lesions with malignancy were <5cm. Ultrasonography is highly sensitive (95.3%) and specific (100%) in characterising lipomas. This demonstrates that size alone should not be the sole indicator for escalation in investigation modalities (e.g. MRI), and that clinical assessment combined with ultrasonography is adequate in identifying low-risk lesions suitable for excision at non-sarcoma centres.
Presenters
Authors
Authors
Dr Jun Guang Kendric Tan - , Dr Huayi Huang - , Dr Daniel Jia Wei Lee - , Dr Ruwan Wijesuriya -
