Bladder cancer is either a rare disease or mild.
If something requires a medical diagnosis, then lab tests or imaging is required.  All rare diseases require a medical diagnosis. If something is mild, then no lab tests or imaging is required.  All blood cancers are rare diseases. All Leukemia is blood cancer.  If bladder cancer is either both blood cancer and Leukemia or neither blood cancer nor Leukemia, then bladder cancer is Leukemia.
∀x (RequiresAMedicalDiagnosis(x) → LabTestsOrImagingRequired(x))  ∀x (RareDiseases(x) → RequiresAMedicalDiagnosis(x)) ∀x (Mild(x) → ¬LabTestsOrImagingRequired(x))  ∀x (BloodCancer(x) → RareDiseases(x)) ∀x (Leukemia(x) → BloodCancer(x)) ¬(BloodCancer(bladderCancer) ⊕ Leukemia(bladderCancer)) → Leukemia(bladderCancer)