What is this tennis ball sized lump under my armpit after lumpectomy?

A tennis ball-sized lump appearing suddenly after lymph node removal can understandably be concerning and warrants prompt medical attention from your surgical team. This type of swelling in the surgical area can happen for various reasons post-surgery, and your healthcare providers will be able to properly evaluate what's causing it and recommend the best next steps for your recovery.

I don’t know . 🙏 praying What did the doctor say ?

I suggest calling the doctor asap.sending prayers

I have been fighting prostate cancer 4th stage. I have kicked ass. Started out my PSA was 2400 hundred with in the first year I have been able to get my PSA # down to 1.3. but unfortunately it metastisized8 into Bone cancer and have no direction to go after this last chemo hopefully this will kick its butt.

Could this be a Sarcoma? Look up lymphedema. This happens when your lymph nodes respond negatively to the surgery. It is treatable. Call your doctor immediately.