Lingual thyroid

DIAGNOSIS-:LINGUAL THYROID-;-USG neck- no thyriod gland in neck::Tc99-isotope uptake in base of toungue area::Cause-faliure of migration of thyroid tissue as endodermal pouch through foramen of caecum and sequestration within the tongue substance::HYPERTROPHY of the gland occurs when requirement increases as in puberty,metabollic stress,pregnacy,infection,trauma,menopause:: In 70% of lingual thyriod cases absence of normal thyriod gland::Histologicaly resembles normal thyroid::Goiterogenous stimulus can cause colloidal changes::Conservative treatment to suppress TSH::Surgery-midline splitting dorsal tongue(per oral approach)::