How can swollen leg in prostate cancer patient be managed?

Hello doctor,

I am 68 years old, male. Height is 178 cm and weight is 71 kg.

Past Problem- Prostate Cancer Surgery last year. Current problem- Swelling in whole left leg and have too much pain. I cannot move leg. Post treatment- Hormone therapy maintenance doses of Firmagon (Degarelix) injection every 3 months. PSA- 0.01. Current situation- 3 weeks ago had swelling in left leg and doctors took out fluid from left knee. I had my Firmagon (Degarelix). Checked with local orthopedic, he told it is arthritis.

1. What is treatment of swollen leg? Doctors told me that there is no relation of Prostate cancer surgery with swollen leg.

2. Is it the effect of prostate cancer?

3. Is it the after-effect of Hormone therapy?

4. Why there is swelling 2 times in whole left leg within one month?

5. Can you suggest any medicine to reduce swelling in leg?

Following was my reports last year before prostate cancer surgery:-

1. PSA level was 24.

2. Gleason score is 9 (5+4).

3. DRE (digital rectal examination).

4. Conducted Ga68 PSMA scan and result is below:-

a. PSMA avid lymphnode is noted in left external pubic ramus.

b. Mildly PSMA avid sclerotic lesion is noted in left external iliac region.

c. Solitary mildly PSMA avid bony lesion is likely to be part of same disease process.

d. PSMA expressing prostate lesion(with extension and involvement) with lymphnodal.

e. Liver and spleen shows physiological tracer distribution.

f. Both lungs are unremarkable.

g. Urinary bladder shows of diverticulum in right posterolateral wall.

h. Gall bladder is visualized.

4. Metastatic Cancer spreads in bones.