Intraoperative Imprint Cytological Diagnosis of Heterotopic Thyroid Presenting as Sellar Mass

A 43-year-old woman presented with headache, nausea, severe visual impairment and galactorrhea and decreased visual acuity. A 4􀂯3.5􀂯3 cm mass completely filling the sphenoid sinus, elevating the pituitary gland and stalk was observed. The patient underwent transsphenoidal removal of the lesion to alleviate visual loss. The tumor cells showed strong positivity for thyroglobulin and TTF-1. This patient was followed up for 2 years after the operation; the laboratory study and computed tomography showed no lesions. In conclusion, this is a rare benign finding in which complete surgical resection achieves a cure.