Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2011.892.898BolouriAbbas JavadzadeBasiratMaryam DalirsaniZohreh MahmoodabadiReza ZareSalehinejadJahanshah 52011115Ectopic thyroid consists of thyroid cells are at sites other than anterior or lateral to the second, third and fourth tracheal rings. Seventy percent of patients with ectopic thyroid, do not have any thyroid tissue at its normal anatomical location. In these patients, ectopic thyroid is prone to functional insufficiency and may come to attention only after compensatory enlargement. If there is no other functioning thyroid tissue, the removal of ectopic thyroid frequently leads to severe hypothyroidism. A patient with a lingual or sublingual thyroid does not require treatment. If patient illustrates hypothyroidism and obstructive symptoms, it is necessary to manage with hormone replacement therapy. If obstructive symptoms can not be decreased, surgical excision is recommended and if the patient does not have eutopic thyroid, the patient will require lifelong hormone replacement therapy. We introduce a 31 year-old female with a firm, nontender mass with smooth surface, mildly mobile mass in both left submandibular and sublingual regions extended to right region. A surgery of the mass of floor of the mouth with salivary gland tumor clinical diagnosis was performed. The histotopathologic examination revealed ectopic thyroid. Because of the lack of eutopic thyroid, she is undertaken hormone replacement therapy. Ectopic thyroid should be considered in differential diagnosis of sublingual mass for avoiding from unnecessary treatments.]]>Aguirre, A., M.D. La-Piedra, R. Ruiz and J. Portilla,1991717376Zieren, J., M. Paul, M. Scharfenberg and C. Menenakos,20061711941198Batsakis, J.G., A.K. El-Naggar and M.A. Luna,19961059961000Burger, M.F., P. Holland and B. Napier,200685752753Congdon, T., L.Q. Nguyen, C.R. Nogueira, R.L. Habiby, G. Medeiros-Neto and P. Kopp,20018639623967Damiano, A., A.B. Glickman, J.S. Rubin and A.F. Cohen,199634141148De Jong, R.J.B., R.J. Rongen, J.S. Lameris, P. Knegtd and C.D.A. Verwoerdd,199355299302Hollander, E.J., M.J. Visser and J.M. van Baalen,200439260262Erich, N., B.S. Mussak and A. Kacker,2007136870887Falvo, L., A. Berni, A. Catania, V. D'Andrea, S. Palermo, C. Giustiniani and E. De Antoni,200535304308Feller, K.U., A. Mavros and H.J. Gaertner,200090618623Giannoulis, G., L. Manolidi and P. Grammaticos,19684011751181Gungor, B., T. Kebat, C. Ozaslan and S. Akilli,200232148150Hagiuda, J., I. Kuroda, T. Tsukamoto, M. Ueno, C. Yokota, T. Hirose and N. Deguchi,200661818Huang, T.S. and H.Y. Chen,200729885888Kanaya, H., Y. Tanigaito, N. Shyono, H. Hirabayashi and K. Baba,2005108850853Kopp, P.,200214320192024Kousta, E., K. Konstantinidis, C. Michalakis, G.E. Theodoropoulos, M. Vorias, M. Georgiou and G. Sambalis,20054231234Kuehn, P.G., R.C. Newell and J.F. Reed,1966274652654Kum, C.K., P. Goh and M. Teh,199363738740Kumar, R., R. Gupta, C.S. Bal, S. Khullar and A. Malhotra,200010363365Kumar, R., S. Khullar, R. Gupta, A. Marwah and M.A. Drm,200025253254Macchia, P.E., P. Lapi, H. Krude, M.T. Pirro and C. Missero et al.,1998198386Massine, R.E., S.J. Durning and T.M. Koroscil,20011111911196Maurice, N., M. Makeieff, J. Delol, P. Bec, L. Crampette and B. Guerrier,1995112399405McCoul, E.D. and E.J. de Vries,200911919371940Morgan, N.J., P. Emberton and R.P.E. Barton,1995109674676Mosier, K.M.,200841103137Radkowski, D., J. Arnold, G.B. Healy, T. McGill, S.T. Treves, H. Paltiel and E.M. Friedman,199111713781381Sauk, Jr. J.J.,1970102239243See, A.C., S.G. Patel, P.Q. Montgomery, P.H.R. Evans and C. Fisher,1998112673676Sood, A., V. Sood, D.R. Sharma, R.K. Seam and R. Kumar,200835843846Soscia, A., G. Guerra, M.P. Cinelli, D. Testa, V. Galli, V. Macchi and R. De Caro,200426338343Strohschneider, T., D. Timm and C. Worbes,199364751753Zapater, L.E., J.P.J. Roig, A.P. Valles, V.M. Sanjuan and M.A. Carceller,200532373387Akoz, T., B. Erdogan, M. Ayhan and F. Cinar,1998119323325Alsop, J.E., P.J. Yerbury, P.J. O`Donnell and E. Heyderman,198615518519Di Benedetto, V.,19973217451746Emlik, D., A. Karabacakoglu, S. Karakose, A. Kaya and G. Tastekin,2003487882Helidonis, E., G. Dokianakis, G. Papazoglou, P. Pantazopoulos and H. Thomopoulou,198094219224Hansen, L.T. and P.H. Christensen,199615833243325Kumar, R., S. Sharma, A. Marwah, D. Moorthy, D. Dhanwal and A. Malhotra,200126306309Omur, O., S.S. Ozbek, Y. Ertan and Z. Ozcan,2007164749Paksoy, N.,200751222226Paresi, R.J. Jr. and D. Shah,2005132806808Piantanida, E., E. Compri, A. Lai, V. Lombard and I.D. Mule et al.,20092009Sambola-Cabrer, I., J.M. Fernandez-Real, W. Ricart, J.F. Barbas, M. Olle and J. Teruel,199688790Sironi, M., A. Assi, M. Andruccioli and G. Spreafico,199621585585Temmel, A.F., W.D. Baumgartner, E. Steiner, K. Kletter, P. Franz and A. Kautzky-Willer,199819342344Tucci, G. and F. Rulli,1999209799