Introduction

A lipoma is a common, benign tumour of adipocytes.

Epidemiology

  • Incidence: 100.00 cases per 100,000 person-years
  • Peak incidence: 50-60 years
  • Sex ratio: 1:1
<1 1-5 6+ 16+ 30+ 40+ 50+ 60+ 70+ 80+

Pathophysiology

Pathophysiology
  • they are generally found in subcutaneous tissues
  • rarely, they may also occur in deeper adipose tissues
  • malignant transformation to liposarcoma is very rare

Clinical features

Features
  • lump characteristics:
    • smooth
    • mobile
    • painless

Investigations

The diagnosis is usually clinical based on the typical examination findings.

Management

Management
  • may be observed
  • if diagnosis uncertain, or compressing on surrounding structures then may be removed

Complications

Liposarcoma

Features suggestive of sarcomatous change:
  • Size >5cm
  • Increasing size
  • Pain
  • Deep anatomical location

In one series the presence of all 4 features was associated with up to 85% being sarcomatous.