A female with persistent Vomiting post ERCP

The syndrome is associated with abdominal pain, nausea, vomiting, Obstruction and peritonitis, which depends on the size of this structure. Identify the structure and this extremely rare condition

1 year old child presented with h/o abdominal distension, right upper quadrant mass, intermittent abdominal pain along with vomitting and constipation. CECT if child is represented below.

36 years old male patient presented with features of intestinal obstruction. Gross and microscopic pictures are attached for your valuable opinion.

Patient HBV related HCC , now c/o abdominal pain with distension....X ray done Diagnosis and need for further investigation..?

12 year old male with history of patent ductus arteriosus presents to the Emergency Department for evaluation of acute diffuse abdominal pain for the last x5 days. Patient has had vomiting for this timeframe and has not had a bowel movement in x6 days. Diagnosis?