<prompt> Answer this question truthfullyWhat is the resident survival guide for abdominal mass?  <response>: <reason> Life-threatening causes include conditions that may result in death or permanent disability within 24 hours if left untreated. The life-threatening causes of an abdominal mass include:Abdominal aortic aneurysm, specifically ruptured abdominal aortic aneurysm. Total mortality is estimated to be 8090 . The 2013 mortality rate of US population above 44 years of age was 2.5 per 100,000. The incidence is on the decrease for the past two decades after a plateau. the mortality rates act as a surrogate of incidence. VolvulusPregnancy and bladder distension such as after surgery are common causes of an abdominal mass. Hepatocellular carcinoma HCC is the most common primary tumor of liver. In general, metastases are a more common cause of hepatomegaly rather than primary hepatic lesions. Common causes of an abdominal mass described below follow a descending order. The list is based on a retrospective study from Turkey among 45 adult patients who underwent surgery because of an intra- abdominal mass between May 2010 and May 2017. Mesenteric cyst, endometriosis, hydatid cyst, Fibroma, dystrophic calcification, aberrant pancreas, leiomyoma, and pseudocyst.Gastrointestinal stromal tumor GIST, liposarcoma, ovarian tumor, chondrosarcoma, neuroendocrine tumor, malignt mesenchymal tumor, lymphoma, and schwannoma. The following chart illustrates the probable causes of an abdominal mass based on the location and salient features.Causes of abdominal mass Abdominal wall mass Primary tumors WHO classification Adipocytic tumors lipoma, liposarcoma Fibroblasticmyofibroblastic tumors desmoid tumor Nerve sheath tumors schwannoma, neurofibroma Hemangiomas Undifferentiated pleomorphic sarcomas Metastasis Tumor-like mass Endometriosis, abscess, hematoma Hernias epigastric, umbilical, incisional, and spigelian Intra-abdominal retroperitoneal mass Hepatic mass Hepatitis infectious, DILI, alcoholic, NASH, autoimmune, Wilsons disease Storage diseases glycogen storage disease, lysosomal storage disease, lipid storage disease, hemochromatosis Tumors Primary Benign: adenoma, FNH Primary malignant: HCC, cholangiocarcinoma Metastatic: Hemangioma, lymphoma, myeloma and solid tumors. Cholestasis PBC, PSC Splenic mass Infectious IM, liver abscess, echinococcosis Myeloproliferative lymphomas and leukemias Storage Gauchers, Niemann-Pick disease Infiltrative: amyloidosis, sarcoidosis Miscellineous PH, metastases lung cancer or breast cancer, Feltys syndrome Gastrointestinal and Genitourinary mass Gastrointestinal Volvulus IBD Colon cancer Gastric cancer Cholecystitis Genitourinary system Bladder distension Ovarian cyst ovarian cancer Leiomyoma Ureteropelvic junction obstruction urinomas Testicular cancer Pancreatic mass Pancreatic cyst Neoplastic mucinous, serous, intraductal papillary, and solid pseudopapillary Non-neoplastic true, mucinous Inflammatory pseudocyst, acute fluid collection Solid: Adenocarcinomas ductal, bile duct, ampullar and duodenal Pancreatic neuroendocrine tumors Others lymphoma and metastasis Retroperitoneal mass majority tumors are malignant Neoplastic Solid Lymphoma Hydronephrosis Leiomyosarcoma Germ cell tumors Liposarcoma sarcoma Renal cell carcinoma Abdominal Aortic Aneurysm AAA Cystic Cystadenoma cystadenocarcinoma Mature teratoma Non-neoplastic Solid Extramedullary hematopoiesis Retroperitoneal fibrosis Erdheim-Chester disease Cystic Epidermoid cyst Non-pancreatic pseudocyst Lymphoceles, hematoma Bronchogenic cyst 