The purpose of this article is to report the case of a 70-year-old female with cannon ball lung metastasis from primary malignancy in thyroid (Anaplastic carcinoma). A 70-year-old female presented with complaints of cough with expectoration which was blood tinged, Shortness of breath and generalised weakness. Chest X-ray showed multiple cannon-ball lung shadows. Contrast enhanced tomography scan of chest was done showing multiple well defined cannon ball metastases and well defined heterogeneous mass lesion in left lobe of thyroid – suggestive of primary thyroid malignancy - Retrospective Ultrasonography of thyroid was done which showed solid, irregular shaped mass with increased colour uptake within the thyroid gland. Fine needle aspiration from thyroid nodule showed Anaplastic neoplasm of the thyroid.
