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General GI DDx:
Crohn�s, lymphoma, TB (infection), mets, CA, radiation, ischemia
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Mucosal:
acute angle, absence of normal mucosal pattern, irregular fuzzy margin
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Submucosal:
obtuse angle, presence of normal mucosal pattern, smooth distinct margin
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Extrinsic:
spiculation, tethering
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AIDS: infection �
CMV, Candida, herpes, Cryptosporidium, MAI;
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AIDS: tumor �
KS, lymphoma;
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AIDS: esophagus �
ulcers (Candida, CMV, herpes, HIV), sinus tracts (TB, Actinomycosis);
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AIDS: proximal small bowel �
ulcers (cryptosporidium), nodules (KS, lymphoma, MAI);
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AIDS: distal small bowel �
enteritis (TB, MAI, CMV);
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AIDS: colon �
colitis (CMV, pseudomembranous), typhlitis;
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AIDS: rectum � herpes, lymphoma;
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AIDS: biliary �
strictures (CMV, Cryptosporidium);
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AIDS: liver and spleen �
KS, lymphoma, Candida, TB, MAI, PCP
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Abdominal trauma:
liver laceration (#1), splenic lac, renal trauma, bowel hematoma, pancreatic fx, GB injury, adrenal hemorrhage
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Abdominal complications after cardiac surgery:
GI hemorrhage, cholecystitis, pancreatitis, perforated peptic ulcer, mesenteric ischemia, perforated diverticulitis
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Low density lymph nodes:
TB, MAI, lymphoma, testicular tumor, mucinous adenoCA, Whipple�s
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Cystic abdominal mass:
abscess, loculated ascites, panc pseudocyst, ovarian cyst or tumor, lymphocele, cystic lymphangioma, enteric duplication cyst, cystic teratoma
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Mesenteric mass:
lymphoma, mets, carcinoid, mesenteric fibromatosis, mesothelioma
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Large LUQ mass:
stomach (leiomyosarcoma), pancreas (pseudocyst, nonfunctioning islet cell tumor, mucinous tumor), adrenal (carcinoma), spleen (lymphoma), kidney (RCC, lymphoma)
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RLQ inflammation:
appendicitis, Crohn�s, cecal diverticulitis, perforated cecal CA, mesenteric adenitis, PID
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Volvulus:
gastric (organoaxial, mesenteroaxial), midgut, colon (sigmoid, cecal)
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Hernia:
paraesophageal, paraduodenal, inguinal, umbilical, Spigelian, lumbar, Richter�s, incisional
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Abdominal wall:
mets (melanoma, NF, iatrogenic seeding), rectus sheath hematoma (trauma, anticoagulation)
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Ascites:
cirrhosis, mets, CA, hypoalbuminemia, CHF, pancreatitis
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Gasless abdomen:
obstruction with fluid-filled bowel, severe vomiting, high obstruction, achalasia, impaired swallowing, continuous NG suction
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