JKM2 | Bladder Flat Lesions

Case ID: 124

Publication date: 14 Apr, 2026

Consensus grade: Atypia/dysplasia

User	Diagnosis	Difficulty	Comment
Pathologist 1	Atypia/dysplasia	Typical
Pathologist 2	Atypia/dysplasia	Typical
Pathologist 3	Atypia/dysplasia	Typical
Pathologist 4	Reactive atypia	Typical
Pathologist 5	Reactive atypia	Typical
Pathologist 6	Atypia/dysplasia	Typical
Pathologist 7	Atypia/dysplasia	Typical	before 2016 I would have called it hyperplasia :-)
Pathologist 8	Atypia/dysplasia	Borderline higher
Pathologist 9	Atypia/dysplasia	Borderline higher
Pathologist 10	Atypia/dysplasia	Typical
Pathologist 11	Atypia/dysplasia	Borderline lower
Pathologist 12	Atypia/dysplasia	Bordering on higher	No specific comment.
Pathologist 13	Atypia/dysplasia	Typical
Pathologist 14	Atypia/dysplasia	Bordering on lower
Pathologist 15	Atypia/dysplasia	Typical
Pathologist 16	Atypia/dysplasia	Bordering on higher
Pathologist 17	Atypia/dysplasia	Typical
Pathologist 18	Atypia/dysplasia	Bordering on higher
Pathologist 19	Reactive atypia	Bordering on lower
Pathologist 20	Atypia/dysplasia	Bordering on higher	Bordering on reactive atypia vs low grade dysplasia : No significant inflammation noted: not sufficeint for CIS; I may get CK 20 and look for full thickness staining to confirm low grade urothelial dysplasia.
Pathologist 21	Atypia/dysplasia	Bordering on lower
Pathologist 22	Atypia/dysplasia	Typical

Case description (by case creator):

Flat lesion

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