Squamous cell carcinoma of the lung and pulmonary metastasis of papillary thyroid carcinoma: a case report

Background The coexistence of malignancies in a patient may be explained by the tumor-to-tumor metastasis phenomenon or multiple primary malignant tumors, both of which are not common findings. Here, we are going to present a case with coexistent papillary thyroid carcinoma and primary squamous cell carcinoma of the lung.