Biomedical subjects
Publications and source records attributed to C R Cannon.
Warthin's tumor is usually found in the parotid gland, but may be found in other sites as heterotopic tissue. The most likely explanation for this occurrence is a relationship to the branchial cleft apparatus. Complete surgical excision of Warthin's tumor effects a cure in most cases.
Advances in imaging technique have improved the efficiency of clinical nuclear magnetic resonance (NMR) imaging, and will allow total patient examination time that equals or is more favorable than that of x-ray computed tomography (CT). The whole head can be examined with NMR in a 6.5-minute imaging time with a spatial resolution of 1.7 mm. Fifteen sections in the body can be similarly imaged. Quantitative T2 ("spin-spin" relaxation time) information, as well as estimates of T1 ("spin-lattice" relaxation time) can be obtained in this time. Quantitative T1 information requires an additional procedure.
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Reconstruction of intraoral defects after tumor ablation has been accomplished by a variety of different techniques. A platysma myocutaneous flap for intraoral reconstruction is outlined and the surgical technique described. Nineteen of 22 patients in whom this flap was used healed without major complication. In selected patients, the platysma myocutaneous flap is a highly useful one-stage procedure to close defects of the oral cavity. It provides 50 to 75 sq cm of flap coverage. The flap thickness closely matches the thickness of the mucosa of the oral cavity. The donor site is closed primarily with little or no cosmetic defect.
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This case is believed to be the eighth one reported of normal salivary gland tissue occurring as a tumor or mass within the middle ear (Fig. 1). Although rare, this entity should be considered in the differential diagnosis of a mass within the middle ear. It is associated with anomalies of the ossicular chain and facial nerve. These anomalies often dictate the clinical management of these patients.
Most laryngectomies are performed for neoplastic disease. Recently, the authors have managed four patients with chronic aspiration who ultimately required laryngectomy to control leakage of food and saliva into the tracheobronchial tree. Various surgical procedures have been devised to conserve the larynx and protect the lower airway. Although potentially reversible, these procedures are fraught with complications, and the patients seldom recover sufficiently to justify repair of the larynx. The authors feel that those patients with poor prognoses, associated medical problems, and evidence of impaired wound healing should undergo laryngectomy. This approach removes doubt about the cause of the aspiration and spares the patients additional surgical procedures should a more conservative approach fail.
A mass in the preauricular area usually indicates the presence of a neoplastic or inflammatory process within the parotid gland. Osteochondrosis is an unusual disease process affecting large joints, particularly the knee. Rarely, the temporomandibular joint (TMJ) may be affected. The disease process involves the synovial lining of the TMJ and is commonly ascribed to a benign neoplastic process or metaplasia, although trauma and inflammation have also been implicated. This process can result in single or multiple loose cartilage bodies (joint mice) within the joint cavity. Symptoms are usually those of a mass in the preauricular area, or those of TMJ dysfunction (pain, dislocation, click, decreased range of motion). Physical findings are limited to presence of a mass in the pre-auricular parotid area with a paucity of other parotid findings. Treatment involves removal of the loose cartilage bodies from the TMJ and possibly the synovial lining, if it appears to be severely damaged.