Head & Neck Pathology.

This article presents several cases of rare tumors and their clinical and pathological characteristics. The first case discusses a highly aggressive tumor called sinonasal teratocarcinosarcoma, which can be difficult to diagnose due to its morphological heterogeneity. The second case focuses on oncocytic lesions in the salivary glands, highlighting the challenges in distinguishing them from other conditions. The third case examines papillary thyroid carcinoma arising within a branchial cleft cyst, emphasizing the need for further investigation. The fourth case explores an unusual presentation of hepatocellular carcinoma as an intraoral mass. Additionally, the article discusses IgG4-related disease in the head and neck region, emphasizing the importance of accurate diagnosis based on histological features, radiology, and serum IgG4 levels. [Extracted from the article]