title: Extranodal non-Hodgkin lymphoma involving the muscles of mastication.
abstract: Involvement of the skeletal muscle by non-Hodgkin lymphoma (NHL) is unusual. The most commonly affected muscles are those of the extremities, pelvis, and gluteal regions; rarely are the muscles in the head and neck involved. We report the clinical, CT, and MR imaging findings in two patients with extranodal NHL in the head and neck region involving the muscles of mastication. One patient was immunocompetent and had lymphoma that arose within the muscles; the other was a patient with AIDS who had disseminated disease at diagnosis. In both patients, the involved muscles were isodense with normal muscles on CT scans. On MR images, the infiltrated muscles were isointense with normal muscles on the T1-weighted sequence and hyperintense on the fast spin-echo T2-weighted sequence, with variable enhancement after administration of intravenous contrast material.
authors.affiliation: Department of Radiology, Mount Sinai School of Medicine, City University of New York, NY, USA.
authors.forename: J
authors.initials: J
authors.lastname: Chong
authors.forename: P M
authors.initials: PM
authors.lastname: Som
authors.forename: A R
authors.initials: AR
authors.lastname: Silvers
authors.forename: J F
authors.initials: JF
authors.lastname: Dalton
mesh_terms: D005260:Female; D006801:Humans; D016483:Lymphoma, AIDS-Related / Q000175:diagnosis; D008228:Lymphoma, Non-Hodgkin / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D008297:Male; D008410:Masticatory Muscles / Q000000981:diagnostic imaging / Q000473:pathology; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed