Psoriatic arthritis (PsA) is a common relapsing inflammatory skin disease associated with joint symptoms in patients with psoriasis. Temporomandibular joint (TMJ) disorders are found in 68.8% of affected patients, however most cases of PsA associated with TMJ ankylosis are not reported. We experienced a case of TMJ ankylosis suspected to be caused by PsA. The patient was a 45-year-old male who had developed erythema of the skin and was diagnosed with psoriasis vulgaris at approximately 27 years of age. He was referred to us due to limited range of mouth opening as well as pain in the bilateral TMJ. Panoramic radiography revealed narrowing of the bilateral TMJ space, while computed tomography imaging showed prominent destructive and sclerosing changes in the bilateral mandibular condyle and glenoid fossa. Blood test results indicated a mildly decreased ferritin level and were negative for rheumatoid factor. The patient initially refused surgery and was given mouth opening exercises, though he stopped going to follow-up examinations. A few years later, he returned to our department with the same complaints, and a gap arthroplasty with a temporalis myofascial flap was performed. At a follow-up examination two years later, his maximal mouth opening had been maintained at 34 mm.

Tenosynovial giant cell tumor (TSGCT) is a benign tumor that mainly affects the joints of the fingers and knees, and is considered to be extremely rare in the temporomandibular joint. In this report, we describe a case of localized TSGCT in the temporomandibular joint. The patient, a 48-year-old male, had been suffering from pain in the right temporomandibular joint and right ear for several years, and had been treated by a general practitioner based on a diagnosis of temporomandibular joint arthrosis. CT images showed a soft tissue shadow in the posterior portion of the right mandibular head, but there was no evidence of destruction of the surrounding tissue or mandibular head resorption. MR images showed a nodular lesion between the right-side mandibular head and external auditory canal with low-signal area on T1-weighted and T2-weighted images. Two years after the first admission, the patient underwent enucleation of the tumor, and a diagnosis of TSGCT was obtained by histopathological examination. Two years have passed since the surgery. The aperture has remained at 40 mm, with no evidence of recurrence.

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