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Introduction: Metastasis to thyroid gland is very rare accounting for less than 4% of all thyroid malignancies.The most common tumours which are reported to metastasize to thyroid are breast and kidney malignancies.This study was aimed to study the incidence and primary origin of metastatic tumours to the thyroid diagnosed by FNA and to examine their clinicpathologic and cyto-morphologic features. Methods:Six cases of metastatic lesions to thyroid diagnosed on fine needle aspiration cytology over a period of 2 years from January 2020 to January 2022 were analysed. Results:6 cases of metastatic lesions to thyroid were diagnosed on fine needle aspiration cytology. The patients were aged between 55 to 70 years with 2 male and 4 female patients. Primary tumour was known in 4 cases, while 2 cases on further evaluation revealed primary squamous cell carcinoma of lung metastatic to the thyroid. Conclusion:Lung cancer was the most common tumour to metastasize to the thyroid gland, contributing 50% of the cases in our study. The diagnosis of metastatic thyroidtumours should be considered for thyroid masses in patients with a history of malignancy in other organs. [ABSTRACT FROM AUTHOR]

Synovial sarcomas are rare tumors accounting for approximately 5-10% of soft tissue sarcomas. They occur predominantly in the extremities, followed by head and neck. Primary pulmonary sarcomas are very rare and comprise only 0.5% of all primary lung malignancies. The diagnosis is established only after sarcomas like primary lung malignancies, and metastatic sarcomas have been excluded. For synovial sarcomas that arise at unusual locations, a deinitive diagnosis is challenging and requires the use of ancillary diagnostic procedures such as immunohistochemistry (IHC) and molecular genetic techniques for conirmation of diagnosis. We report a case of 29-year-old male who had right lower lobe lung mass. He underwent right lower lobectomy. Intraoperative squash smears revealed spindle cell sarcoma. Subsequent histopathology and IHC conirmed the diagnosis as synovial sarcoma. We report this case on account of its rarity and to emphasize the utility of intraoperative squash smears in the diagnosis of such cases, which has been under-utilized in clinical practice. [ABSTRACT FROM AUTHOR]