Surgical excision of complex lipoma from the foot: a case report 

Abstract Background: Soft tissue malignant tumours of the foot and ankle are rare. Diagnostic imaging and interventional biopsy are vital to establish the nature and grading of a suspicious tumour prior to surgical intervention. The purpose of the study is to provide an account on how a symptomatic mass to the plantar aspect of the foot warranted a referral to a sarcoma centre, highlighting the importance of having urgent access to diagnostic imaging and a pathway to refer suspected cases to specialist centres.Method: A single patient with a symptomatic soft tissue tumour of the plantar foot was referred from our service to the regional sarcoma centre. It was considered to be benign and therefore open surgical resection was performed under local anaesthesia by our team, and the lesion sent for histopathological examination.Results: Histopathological analysis identified the excised mass as a lipoma to show no atypia or necrosis and mature adipose tissue with fibrous bands. At 2 years postoperatively there was no recurrence and the patient presented an asymptomatic foot. Favourable patient reported outcomes measures were observed.Conclusion: United Kingdom (UK) Guidelines suggest that all soft tissue masses of suspicious nature, greater than 50mm, deep seated irrespective of size, or fast growing should be referred to a sarcoma unit prior to surgical management. European guidance identifies a threshold of 15mm for a mass in the foot. Patients presenting with red flag symptoms irrespective of size of mass should be referred to a sarcoma centre. Advanced imaging and multidisciplinary input to enable appropriate surgical planning is recommended for these soft tissue tumours that present to the foot and ankle surgeon. Level of evidence: V case study.