An explanation for this erosion of the bone has not yet been found. Diagnosis
The presence of dehiscence can be detected by a high definition (0.6 mm or less) coronal CT scan of the temporal bone, currently the most reliable way to distinguish between superior canal dehiscence syndrome (SCDS) and other conditions of the inner ear involving similar symptoms such as Ménières disease, perilymphatic fistula and cochlea-facial nerve dehiscence. Other diagnostic tools include the vestibular evoked myogenic potential or VEMP test, videonystagmography (VNG), electrocochleography (ECOG) and the rotational chair test. An accurate diagnosis is of great significance as unnecessary exploratory middle ear surgery may thus be avoided. Several of the symptoms typical to SCDS (e.g. vertigo and Tullio) may also be present singly or as part of Ménières disease, sometimes causing the one illness to be confused with the other. There are reported cases of patients being affected by both Ménières disease and SCDS concurrently.As SCDS is a very rare and still a relatively unknown condition, obtaining an accurate diagnosis of this distressing (and even disabling) disease may take some time as many health care professionals are not yet aware of its existence and frequently dismiss symptoms as being mental health-related. Treatment
Once diagnosed, the gap in the temporal bone can be repaired by surgical resurfacing of the affected bone or plugging of the superior semicircular canal. These techniques are performed by accessing the site of the dehiscence either via a middle fossa craniotomy or via a canal drilled through the transmastoid bone behind the affected ear.
An arthropathy is a disease of a joint. Types
Arthritis is a form of arthropathy that involves inflammation of one or more joints, while the term arthropathy may be used regardless of whether there is inflammation or not. Joint diseases can be classified as follows:

ArthritisInfectious arthritisSeptic arthritis (infectious)
Tuberculosis arthritis
Reactive arthritis (indirectly)Noninfectious arthritisSeronegative spondyloarthropathy:Psoriatic arthritis
Ankylosing spondylitisRheumatoid arthritis:Feltys syndromeJuvenile idiopathic arthritis
Adult-onset Stills disease
Crystal arthropathyGout
ChondrocalcinosisOsteoarthritisHemarthrosis (joint bleeding)
Synovitis is the medical term for inflammation of the synovial membrane. Joint dislocation

With arthropathy in the name
Reactive arthropathy (M02-M03) is caused by an infection, but not a direct infection of the synovial space. (See also Reactive arthritis)
Enteropathic arthropathy (M07) is caused by colitis and related conditions. Crystal arthropathy (also known as crystal arthritis) (M10-M11) involves the deposition of crystals in the joint. In gout, the crystal is uric acid. In pseudogout/chondrocalcinosis/calcium pyrophosphate deposition disease, the crystal is calcium pyrophosphate. Diabetic arthropathy (M14.2, E10-E14) is caused by diabetes. Neuropathic arthropathy (M14.6) is associated with a loss of sensation.Spondylarthropathy is any form of arthropathy of the vertebral column. Signs and symptoms
Joint pain is a common but non-specific sign of joint disease. Signs will depend on the specific disease, and may even then vary. Common signs may include:
Decreased range of motion
Stiffness
Effusion
Pneumarthrosis, air in a joint (which is also a common normal finding). Bone erosion
Systemic signs of arthritis such as fatigue

Diagnosis
Diagnosis may be a combination of medical history, physical examination, blood tests and medical imaging (generally X-ray initially). Treatment
References


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