Understand a letter from the hospital

I've had a letter I don't fully understand. It's about my dad, I go to his appointments with him.

What I didn't follow: no idea what interval imaging means or whether 9mm is big

Here it is:

Thank you for referring this patient. Examination revealed no lymphadenopathy. Bloods were unremarkable apart from a mildly raised CRP. Ultrasound demonstrated a 9mm hypoechoic lesion, appearances likely benign. We have arranged interval imaging in 6 months. Please continue current management in the interim and re-refer if symptoms progress.

Help me read it:

1. Every medical or technical word in it, in plain words, in the order they appear.
2. What the letter is saying happened, and what it says happens next, step by step.
3. Which parts are results, which are the doctor's opinion or interpretation, and which are standard wording that appears in most letters like this. Label them.
4. Anything the letter refers to but doesn't explain, like a test or a follow-up whose purpose isn't stated.

Then: the questions worth asking at the next appointment, and which one to ask first if there's only time for one.

Explain what the letter says. Don't tell me what it means for our health, don't tell me how serious it is or isn't, and don't suggest treatment. Where the letter is unclear or where the answer depends on things a doctor knows and you don't, put it in the questions rather than filling the gap. If anything in it reads as urgent, say so and point me at ringing the number on the letter or the person who wrote it.

What you get: Every term translated, the letter's parts labelled, and the questions to bring to the appointment.