The Differential Broadener

I am reviewing my thinking on a clinical presentation. Help me
check for blind spots.

Presentation (de-identified, generalised):
[DESCRIBE THE PATTERN — NOT THE PATIENT]

My current differential:
[LIST WHAT YOU HAVE ALREADY CONSIDERED]

Please:
1. List diagnoses consistent with this pattern that are absent from
   my list
2. Separate them into: common but easily missed, rare but serious,
   and "must not miss"
3. For each, state the discriminating feature that would raise or
   lower suspicion
4. Identify which of my listed diagnoses this pattern fits poorly,
   and why
5. Name the cognitive biases this presentation typically invites

Do not rank by probability — you do not have the patient's context.
Do not recommend investigations or management.

I will verify everything you list against current guidance before
it changes my approach.