Head and neck lesions in the immunocompromised host.

Head and neck lesions are encountered in more than 40-50% in patients with immunosuppression (HIV-infected individuals, diabetes mellitus, transplant recipients, patients treated with immunosuppressive drugs or post-radiotherapy). The organs affected are the salivary glands, the lymph nodes, the sinonasal tract, the orbits, the temporal bones, and the pharyngo-laryngeal mucosa. They are mainly involved by granulation tissue, perivascular and perineural inflammation, and neoplasms. In the pediatric population the temporal bone is the most frequent target organ. The most common clinical manifestation of salivary gland involvement is non-specific bilateral painless enlargement of the parotid gland and xerostomia. Lymphoepithelial cyst, sialosis, and lymphoma may be present. The high rate of salivary gland involvement is probably related to the presence of the human immunodeficiency virus within the saliva. Surgery, sclerotherapy by doxycycline, or low-dose radiotherapy may prevent further growth of tumoral lesions. Sinonasal diseases are the most frequent lesions which manifest in immunosuppressed adult patients (66%). They are associated with a trend of decreased survival rate. Invasive aspergillosis is defined by hyphae in the submucosa, and tumor necrosis without host inflammatory response; it may be lethal in 50-80%, especially when the skull base is involved. Computed tomography shows erosion of bone and extrasinonasal extension. The hypointensity of the lesion on T2-weighted images may suggest the diagnosis. Fungal sinus disease can affect 1-10% of transplant recipients and should be suspected when organ rejection is considered. The temporal bone is the most frequent target organ in the immunosuppressed pediatric population due to Eustachian,tube dysfunction. Otomastoïditis, necrotizing external otitis, and otosyphilis are reported. Prompt treatment may avoid lateral sinus thrombosis. Epithelial neoplasms, lymphomas, and Kaposi's sarcoma may also be considered. Kaposi's sarcoma, the most common neoplasm encountered in patients with AIDS, is an indicator of the progression of human immunodeficiency virus infection to AIDS. The lesions are often multifocal at presentation and may affect the skin, the mucosa, and visceral organs. The pathogenesis is unclear, but cytokines and growth factors may play a role. In conclusion, immunosuppressed patients are likely to develop virulent infection with vascular complications.