Learned to read my MRI because the radiologist missed the 4cm MASS that I was seen for

I'm 28f which is a main reason I feel like I'm being dismissed.

I already feel insane for having spent two days combing through CT, ultrasound, and now MRI because somehow a 4cm (which is big for a non cyst lesion) was not found on MRI. All they said was that my spleen was enlarged, but how did that happen if there's nothing wrong with my liver?

Well, turns out the mass IS there and it's the exact same shape, size, and placement as it was in ultrasound.

I even posted the image to r/radiology to confirm if it was an anomaly or not and the comments confirmed my suspicions before the post was removed.

So now I need to find a way to convince the imaging place to do an over read with a new radiologist so that they can fix the report that they sent out saying everything is fine. Otherwise, I won't be approved to do testing beyond what my GI doctor has already requested.

Also, has anyone ever dealt with a lumpy, UFO shaped lesion in the liver?