For the same patient (symptomatic irreversible pulpitis, pain on percussion, NO abscess), what is the periapical diagnosis?

Symptomatic apical periodontitis is characterized by pain on percussion, palpation, or biting. There is inflammation of the periodontium at the apex without signs of a frank abscess (no swelling, sinus tract, or pus). Asymptomatic apical periodontitis has radiographic changes (periapical radiolucency) without symptoms. Acute apical abscess involves pus formation and often swelling. Since the question specifies no abscess is present and the patient has pain on percussion, symptomatic apical periodontitis is the correct periapical diagnosis.