September 7, 2021

1.1. Introduction: Chlorine is a yellow-green gas at room temperature. It is an extremely reactive element and a strong oxidizing agent. It has intermediate water solubility and it can cause acute damage to upper and lower respiratory tract. It can be detected easily because of its strong odor (1,2). Common cause of chlorine gas poisoning these days are accidental industrial exposure. Toxicity of chlorine depends upon the dose and duration of exposure.

Carcinosarcoma of the parotid gland is a rare and aggressive malignant mixed tumor in which carcinomatous and sarcomatous elements coexist and metastasize together. The tumor may occur in patients with previous or coexisting pleomorphic adenoma or may arise de novo of the parotid gland.