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| {{familytree/start |summary=Abdominal mass causes}}
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| {{familytree | | | | | | | | A01 | | | A01='''Abdominal mass'''<ref name="urlACS/ASE Medical Student Core Curriculum">{{cite web |url=https://www.facs.org/education/program/core-curriculum#:~:text=The%20American%20College%20of%20Surgeons,school%20faculty%2C%20and%20clinical%20faculty. |title=ACS/ASE Medical Student Core Curriculum |format= |work= |accessdate=}}</ref>}}
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| {{familytree | | | | | | | | |!| | | | }}
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| {{familytree | | | | | | C01 | | C02 | | | |C01=<div style="float: left; text-align: left; width: 20em; padding:1em;">'''Abdominal wall mass'''<ref name="pmid24378391">{{cite journal |vauthors=Jo VY, Fletcher CD |title=WHO classification of soft tissue tumours: an update based on the 2013 (4th) edition |journal=Pathology |volume=46 |issue=2 |pages=95–104 |date=February 2014 |pmid=24378391 |doi=10.1097/PAT.0000000000000050 |url=}}</ref><ref name="pmid31867236">{{cite journal |vauthors=Li M, Zhang L, Xu XJ, Shi Z, Zhao XM |title=CT and MRI features of tumors and tumor-like lesions in the abdominal wall |journal=Quant Imaging Med Surg |volume=9 |issue=11 |pages=1820–1839 |date=November 2019 |pmid=31867236 |pmc=6902146 |doi=10.21037/qims.2019.09.03 |url=}}</ref><br>
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| ❑Primary tumors ([[WHO]] classification)<br>
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| :❑[[Adipocyte|Adipocytic]] tumors ([[lipoma]], [[liposarcoma]]) <br>
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| :❑Fibroblastic/myofibroblastic tumors ([[Desmoid tumor differential diagnosis|desmoid tumor]])<br>
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| :❑Nerve sheath tumors ([[schwannoma]], [[neurofibroma]])<br>
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| :❑[[Hemangioma]]s <br>
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| :❑Undifferentiated pleomorphic [[sarcoma]]s <br>
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| :❑Smooth muscle tumor ([[leiomyoma]] (not included in WHO classification)<br>
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| ❑[[Metastasis]]<br>
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| ❑Tumor-like mass<br>
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| :❑[[Endometriosis]], [[abscess]], [[hematoma]]<br>
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| :❑[[Hernia]]s ([[epigastric hernia|epigastric]], [[umbilical hernia|umbilical]], [[incisional hernia|incisional]], and [[spigelian hernia|spigelian]])| C02='''Intra-abdominal/<br> [[retroperitoneal]] mass''' }}
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| {{familytree | | | | | | | | | | |!| | |}}
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| {{familytree | | | | | | | | | | |!| |}}
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| {{familytree | | |,|-|-|-|v|-|-|-|+|-|-|-|v|-|-|-|.| }}
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| {{familytree | | |!| | | |!| | | |!| | | |!| | | |!| |}
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| {{familytree | | D01 | | D02| | D03 | | D04 | | D05 |D01=<div style="float: left; text-align: left; width: 20em; padding:1em;">'''Hepatic mass'''<ref name="pmid20955964">{{cite journal |vauthors=vom Dahl S, Mengel E |title=Lysosomal storage diseases as differential diagnosis of hepatosplenomegaly |journal=Best Pract Res Clin Gastroenterol |volume=24 |issue=5 |pages=619–28 |date=October 2010 |pmid=20955964 |doi=10.1016/j.bpg.2010.09.001 |url=}}</ref><ref name="pmid3003936">{{cite journal |vauthors=Maharaj B, Cooppan RM, Maharaj RJ, Desai DK, Ranchod HA, Siddie-Ganie FM, Goqwana MB, Ganie AS, Gaffar MS, Leary WP |title=Causes of hepatomegaly at King Edward VIII Hospital, Durban. A prospective study of 240 black patients |journal=S. Afr. Med. J. |volume=69 |issue=3 |pages=183–4 |date=February 1986 |pmid=3003936 |doi= |url=}}</ref><br>
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| ❑[[Hepatitis]] (infectious, [[DILI]], [[Alcoholic liver disease|alcoholic]],<br> [[NASH]], [[autoimmune hepatitis|autoimmune]], [[Wilson's disease]]<br>
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| ❑Storage diseases ([[glycogen storage disease]], [[lysosomal storage disease]], [[lipid storage disease]], [[hemochromatosis]])<br>
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| ❑[[Tumors]]<br>
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| :❑Primary Benign:[[Hepatic adenoma|adenoma]], [[Focal nodular hyperplasia|FNH]]<br>
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| :❑Primary malignant:[[Hepatocellular carcinoma|HCC]], [[cholangiocarcinoma]]<br>
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| :❑Metastatic: [[Hemangioma]], [[lymphoma]],<br> [[myeloma]] and solid tumors.<br>
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| ❑[[Cholestasis]] ([[Primary biliary cirrhosis|PBC]], [[Primary sclerosing cholangitis|PSC]]) | D02=<div style="float: left; text-align: left; width: 20em; padding:1em;">'''Splenic mass'''<ref name="pmid29135986">{{cite journal |vauthors=Curovic Rotbain E, Lund Hansen D, Schaffalitzky de Muckadell O, Wibrand F, Meldgaard Lund A, Frederiksen H |title=Splenomegaly - Diagnostic validity, work-up, and underlying causes |journal=PLoS ONE |volume=12 |issue=11 |pages=e0186674 |date=2017 |pmid=29135986 |pmc=5685614 |doi=10.1371/journal.pone.0186674 |url=}}</ref><br>❑[[Infections|Infectious]]:[[Infectious Mononucleosis|IM]], [[liver abscess]],<br>[[echinococcosis]]<br>❑[[Myeloproliferative disorders|Myeloproliferative]] ([[lymphoma]]s<br> and [[leukemia]]s)<br>
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| ❑Storage ([[Gaucher’s disease|Gaucher's]], [[Niemann-Pick disease]])<br>❑Infiltrative:[[amyloidosis]], [[sarcoidosis]]<br>
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| ❑Miscellineous ([[Portal hypertension|PH]], [[metastases]] ([[lung cancer]] or [[breast cancer]], [[Felty's syndrome]])| D03=<div style="float: left; text-align: left; width: 20em; padding:1em;">'''Pancreatic mass'''<ref name="pmid27065727">{{cite journal |vauthors=Karoumpalis I, Christodoulou DK |title=Cystic lesions of the pancreas |journal=Ann Gastroenterol |volume=29 |issue=2 |pages=155–61 |date=2016 |pmid=27065727 |pmc=4805734 |doi=10.20524/aog.2016.0007 |url=}}</ref><ref name="pmid21620466">{{cite journal |vauthors=Vincent A, Herman J, Schulick R, Hruban RH, Goggins M |title=Pancreatic cancer |journal=Lancet |volume=378 |issue=9791 |pages=607–20 |date=August 2011 |pmid=21620466 |pmc=3062508 |doi=10.1016/S0140-6736(10)62307-0 |url=}}</ref><br>❑[[Pancreatic cyst]]<br>
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| :❑[[Pancreatic cancer differential diagnosis|Neoplastic]] ([[Mucinous cystadenocarcinoma differential diagnosis|mucinous]], [[serous]], [[Intraductal papillary mucinous neoplasm|intraductal papillary]], and solid pseudopapillary)<br>
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| :❑Non-neoplastic (true, [[mucinous]])<br>
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| :❑[[inflammation|Inflammatory]] ([[Pancreatic pseudocyst|pseudocyst]], [[acute]] fluid collection)<br>
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| ❑Solid:<br>
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| :❑[[Adenocarcinoma]]s ([[Pancreatic cancer classification|ductal]], [[bile duct]], [[Pancreatic cancer classification|ampullar]] and [[Small intestine cancer classification|duodenal]])
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| :❑[[Pancreatic neuroendocrine tumor]]s<br>
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| :❑Others ([[lymphoma]] and [[metastasis]])| D04=<div style="float: left; text-align: left; width: 20em; padding:1em;">'''[[Retroperitoneal]] mass'''<ref name="pmid30559557">{{cite journal |vauthors=Mota MMDS, Bezerra ROF, Garcia MRT |title=Practical approach to primary retroperitoneal masses in adults |journal=Radiol Bras |volume=51 |issue=6 |pages=391–400 |date=2018 |pmid=30559557 |pmc=6290739 |doi=10.1590/0100-3984.2017.0179 |url=}}</ref><br>(majority tumors are [[malignant]])<br>
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| ❑[[Liposarcoma]]<br>
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| ❑[[Incidentaloma]]<br>
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| ❑[[Lymphoma]]|D05=[[Abdominal Aortic Aneurysm]](AAA)|}}
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| {{familytree/end}}
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| <span style="font-size:85%"> '''Abbreviations:''' '''ACS:''' Acute coronary syndrome; '''AAA:''' Abdominal aortic aneurysm; '''RUQ:''' Right upper quadrant; '''RLQ:''' Right lower quadrant; '''LUQ:''' Left upper quadrant; '''LLQ:''' Left lower quadrant</span> | | <span style="font-size:85%"> '''Abbreviations:''' '''ACS:''' Acute coronary syndrome; '''AAA:''' Abdominal aortic aneurysm; '''RUQ:''' Right upper quadrant; '''RLQ:''' Right lower quadrant; '''LUQ:''' Left upper quadrant; '''LLQ:''' Left lower quadrant</span> |