Magnetic resonance imaging of the temporomandibular joint.

Correct diagnosis of internal derangements of the temporomandibular joint requires both a comprehensive clinical and radiographic evaluation. Plain film tomography, transcranial radiography, arthrography and computed tomography have all been used to assess the status of the joint structures. Magnetic resonance imaging is a relatively new modality used for imaging many different organ systems. Magnetic resonance imaging of the temporomandibular joint has certain distinct advantages over previously used techniques in evaluating patients for internal joint derangements. The applicability of magnetic resonance imaging in the diagnosis of internal derangements will be discussed.

Pre-auricular oat cell carcinoma metastases.

The oat cell tumor is a particularly lethal form of bronchogenic carcinoma. Cutaneous metastases occur occasionally in the pre-auricular area. In addition to benign and malignant parotid lesions, the differential diagnosis of a pre-auricular mass must now include metastatic disease, particularly if a history of a thoracic malignancy is elicited. We present two such cases of metastatic oat cell carcinoma in the pre-auricular region.

Malignant melanoma metastatic to the mandible.

Metastatic malignant melanoma to the jaws is uncommon and is usually accompanied by generalized involvement. Hematogenous dissemination with deposition and growth in areas of hematopoietic marrow (that is, the mandibular molar region) is the accepted mechanism for involvement of the jaw. Clinical and radiographic findings are nonspecific. Comprehensive history, physical examination, and tissue microscopy are essential to accurate diagnosis and management of the patient. Radiotherapy for palliation is the accepted mode of therapy for symptomatic metastatic melanoma. Prognosis in cases with secondary jaw involvement is grave. A case of malignant melanoma with metastases to the mandible is presented and the literature is reviewed.