Step 1: Analyze the key clinical feature.
The patient presents with tooth mobility in the mandibular posterior regionTooth mobility indicates significant attachment loss and alveolar bone destruction
Step 2: Interpret the radiographic finding.
A mirror-like pattern of bone loss is characteristic of aggressive periodontal diseaseIn localized aggressive periodontitis, bone loss often appears bilaterally symmetrical and may show arc-shaped or mirror-image defects
Step 3: Evaluate the options.
(A) Localized aggressive gingivitis: Although the term gingivitis is used in the option, the description matches localized aggressive periodontitisWhich is characterized by rapid bone loss and symmetrical radiographic appearance
(B) Generalized aggressive gingivitis: Would involve widespread attachment loss beyond localized regions
(C) NOMA: A severe gangrenous infection affecting soft tissues of the faceNot associated with mirror-like bone loss pattern
(D) ANUG: Primarily affects gingiva with necrosis and painBone loss is not typically symmetrical and aggressive in this pattern
Step 4: Conclusion.
The mirror-like radiographic bone loss pattern with mobility most closely indicates localized aggressive periodontal disease