Amyand's hernia associated with mesenteric chylous cyst in infant: a rare case report.

BACKGROUND: Amyand's hernia is a rare condition approximately 0.4-0.6% of all inguinal hernias. Although rare, the Amyand's hernia is worthy of discussion since the variable presentation that make clinical challenge to diagnose especially in infant. A mesenteric chylous cyst is rare disease and has not been reported in Amyand's hernia. CASE PRESENTATION: We report an unusual case of Type II Amyand's hernia with an enlarging chylous mesenteric cyst on the retrocaecal in the anulus into canalis inguinalis. A-2-months old infant presented with enlarging mass in the right scrotal. During laparotomy exploration, we found inguinal sac with intestinal and appendix content in the sac. In the edge site of the sac we found enlarging of mesenteric cyst on the retrocaecal in the anulus into canalis inguinalis. Based on the histopathology examination, the morphological feature is suitable for mesenteric chylous cyst appearance. CONCLUSION: Presentation of mesenteric chylous cyst is rare, and there was no report about it in Amyand's hernia. This unusual presentation should be considered by the surgeon, especially pediatric surgeon, in Amyand's hernia cases.

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. Immune escape is a carcinogenesis mechanism of tumors to avoid the host immune system by producing PD-L1. This study was conducted to determine whether there is an immune escape through the expression of PD-L1 in salivary gland tumors. The tissue sections of PA, CXPA, and WT were stained with Hematoxylin Eosin and immunostained with a rabbit monoclonal recombinant anti-PD-L1 antibody. We observed immunopositive PD-L1 on the cell membrane with or without cytoplasm staining. PA and CXPA expressed PD-L1, accompanied by an anomaly expression of CXPA in several spots at the salivary gland at the surgical border. Therefore, PD-L1 is one of the PA pathways to transform into CXPA through immune escape. WT expressed PD-L1 in the cytoplasm and lymphoid stroma but not on the cell membrane. It is interpreted as positive constitutive, which may have the function of increasing tumor cell growth, while overexpressed PD-L1 in lymphoid stroma is thought to be associated with a poor prognosis of the tumor and is suspected to transform into malignancy, such as B-cell Lymphoma.