Pathogenesis Analysis of Salivary Gland Tumors Through the Expression of Programmed Death-Ligand 1 (PD-L1).

Pleomorphic adenoma (PA) is the most common salivary gland neoplasm, followed by Warthin's tumor (WT). In addition to its high frequency, PA also shows metastasis and transformation towards malignancy as carcinoma ex-pleomorphic adenoma (CXPA). While the histogenesis of WT remains unclear, especially given the presence of lymphoid stroma around the developing tumor and the immunological interaction between them.

Volvulus Due to Mesenteric Cysts in Infants and Children; A Case Report.

Mesenteric cysts are defined as benign intra-abdominal tumors located in the mesentery. It was a rare disease with an incidence of 1:20000 in children. The most common location was in the small bowel mesentery.