Normal Variation: A 2mm deviation can be within the range of normal variation, especially if the patient is asymptomatic. This minor deviation might not indicate any underlying pathology.

Disc Displacement: A minor disc displacement could cause a slight deviation without significant symptoms. This condition might not always present with severe pain or locking.
Mild TMJ Dysfunction: Early or mild temporomandibular joint dysfunction could manifest with minimal deviation during opening and closing without significant pain or other symptoms.
Occlusal Interference: A minor occlusal interference could cause a slight deviation during jaw movements, especially if the interference is not significant enough to cause pain or discomfort.

Early Stage TMJ Degenerative Disease: Although less likely, early stages of degenerative diseases like osteoarthritis could present with minimal symptoms and slight deviation. Missing this diagnosis could lead to progression of the disease.
Benign TMJ Tumors: Rarely, benign tumors could cause a deviation without significant symptoms. Early detection is crucial for effective management.
TMJ Fracture or Microfracture: A small, non-displaced fracture or microfracture might not cause significant pain but could lead to more severe issues if not addressed.

Synovial Chondromatosis: A rare condition where cartilaginous nodules form within the TMJ, potentially causing deviation and other symptoms.
TMJ Ganglion Cysts: Although rare, ganglion cysts can occur in the TMJ and might cause a deviation, especially if they are large enough to interfere with joint movement.
Inflammatory Arthritis: Conditions like rheumatoid arthritis or psoriatic arthritis affecting the TMJ could present with deviation among other symptoms, but are less common in the asymptomatic patient.