X ray 9

Interesting case:

A 50 years old male patient with 4 years history of swelling

over the foot.The swelling started and progressed to the

 present size in last 3 - 4 years.No history of any pain

(occasional dragging sensation.),any discharge,no any injury,

No any similar swellings any where.

On examination:

Non tender ,sessile,irregular,lobular swelling with

no local rise of temperature with hard

Consistency and no fluctuation.no movements

 with the muscle movements and no any pulastions.

Distal neuro vascular system is normal and no any

 lymph nodes enlargement.

What is the probable diagnosis?

what will the approach towards the case?