Lipoma is the most common soft tissue tumor arising from yellow fat deposits. It presents as a mobile, lobular mass that is non-tender and has a characteristic "slip sign" where the mass can slip between the examiner's fingers. Lipomas most commonly occur as encapsulated soft tissue masses but can also be found in various locations throughout the body. While lipomas are generally benign and can be excised, certain histological subtypes or locations carry a higher risk of malignant transformation.

1. LIPOMA

3. Introduction
 Commonest tumor of s/c tissue.
 Benign
 Arising from yellow fat
 Universal tumor
 Karyotype 12q change
 Hibernoma

4. Types
 Encapsulated s/c lipoma
 Diffuse variety
 Multiple lipomas- Dercum’s d/s

6. Histological types
 Fibrolipoma
 Neurolipoma
 Naevolipoma

7. Sites
location presentation d.d. Significance
s/c Mobile, lobular, Neurofibrom Most common
edge slips under variety
palp.fingers a
subfascial Diff. to appreciate Implantation In scalp- erodes
edge & lobulation dermoid , bone
Tbtenosynovitis
Subsynovial, Knee/elbow Bursa, Intra-articular is
sweling Baker’s cyst rare
intra-articular
Intermuscular Swelling Fibrosarcoma More chance of
Hematoma devpg
liposarcoma
Parosteal Feels hard Bony tumor Very, very rare

8. Contd..
location presentation d.d. Significance
Submucus Asymptomatic/ Intestinal/laryngea Intussusception
stridor l tumor
Subserosal Retroperitoneal Hydronephrosis, Liposarcoma
swelling retroperitoneal
cyst
Extradural Very rare - -
Intraglandula Breast, pancreas Cystic lesions Very rare
r

9. Clinical features
 Localized, lobular, non-tender
 Semi-fluctuant
 Mobile
 Slip sign
 Skin free
 Pedunculated +/-

11. Complications
 Myxomatous degeneration
 Saponification
 Calcification
 Infection
 Ulceration
 Intussusception & intestinal obstruction

12. Liposarcoma
 Common in retroperitoneum, thigh & back
 Rapid growth
 Warm & vascular
 Dilated veins
 Restriction of mobility
 Skin fixation & fungation
 Hematogenous spread to lungs

13. Treatment
 Excision
 Liposarcoma- wide
excision, reconstruction, adjuvant chemo- &
radiotherapy

15. Thank you…