Incidentally found and unexpected tumors discovered by MRI examination for temporomandibular joint arthrosis.
We examined the frequency of incidentally found or unexpected tumors discovered at the time of magnetic resonance imaging (MRI) examinations in the temporomandibular joint (TMJ) region for patients with suspicion of TMJ arthrosis. Five MR images (T1-weighted transverse scout image and proton density and T2-weighted oblique sagittal images at the open and closed mouth) were acquired. In 2776 MRI examinations of TMJ arthrosis, two tumors were discovered. They consisted of an adenoid cystic carcinoma in the deep portion of the parotid gland, and a malignant tumor extending from the infratemporal fossa to the parapharyngeal space. The rate of incidentally founded or unexpected tumors in TMJ examinations was low (0.072%), but the two tumors found were malignant tumors, and therefore, scout image should be carefully examined, not only used for positing the slice.
Yanagi
Yoshinobu
Y
Department of Oral and Maxillofacial Radiology, Field of Tumor Biology, Graduate School of Medicine and Dentistry, Okayama University, 2-5-1, Shikata-cho, Okayama 700-8525, Japan.
Asaumi
Jun-ichi
J
Maki
Yuu
Y
Murakami
Jun
J
Hisatomi
Miki
M
Matsuzaki
Hidenobu
H
Konouchi
Hironobu
H
Honda
Yosutoshi
Y
Kishi
Kanji
K
D000368:Aged; D001168:Arthritis / Q000175:diagnosis* / Q000453:epidemiology; D003528:Carcinoma, Adenoid Cystic / Q000175:diagnosis; D015838:Chondromatosis, Synovial / Q000175:diagnosis; D006801:Humans; D015994:Incidence; D007564:Japan; D008279:Magnetic Resonance Imaging; D008297:Male; D008339:Mandibular Neoplasms / Q000175:diagnosis; D008875:Middle Aged; D010306:Parotid Gland / Q000000981:diagnostic imaging / Q000473:pathology; D010307:Parotid Neoplasms / Q000175:diagnosis; D010610:Pharyngeal Neoplasms / Q000175:diagnosis; D011859:Radiography; D012189:Retrospective Studies; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging*; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000453:epidemiology