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Abdominal Aortic Aneurysm (AAA) USMLE Step 1 | Causes, Signs, Diagnosis and Treatment in One Shot An abdominal aortic aneurysm (AAA) is a focal dilation of the abdominal aorta measuring more than 3 cm in diameter, most commonly located below the renal arteries. For USMLE Step 1, it is vital to understand its pathophysiology, which involves progressive degeneration of the aortic wall's tunica media due to atherosclerosis, elastin breakdown, and chronic inflammation. Major risk factors include older age (especially over 65), male gender, cigarette smoking (most critical modifiable risk), hypertension, and family history. Inherited connective tissue disorders like Marfan syndrome or Ehlers-Danlos also predispose to aneurysm formation. Most AAAs are asymptomatic and discovered incidentally, but when symptoms occur, they may include a pulsatile abdominal mass, dull back or abdominal pain, or signs of nearby compression. Rupture is a life-threatening emergency characterized by hypotension, tearing abdominal or back pain, and shock — a deadly triad that requires urgent surgical intervention. Screening with abdominal ultrasound is essential in high-risk populations, and CT angiography is used for accurate anatomical mapping and surgical planning. Management includes conservative monitoring for small AAAs and elective surgical repair for aneurysms larger than 5.5 cm in men or 5.0 cm in women, or those growing rapidly. Surgical options include open repair and endovascular aneurysm repair (EVAR). For Step 1, focus on the mechanisms, imaging choices, rupture presentation, and management thresholds to tackle both MCQs and clinical vignettes confidently. #AbdominalAorticAneurysm #AAA #USMLEStep1 #Step1Prep #AorticRupture #USMLEPathology #CTAngiography #UltrasoundImaging #EVAR #CardiovascularPathology #MedStudentReview #USMLEIndia #MedicalEducation #VascularSurgery #InternalMedicine #HighYieldStep1 #USMLE2025 #USMLELecture #Atherosclerosis #EmergencyMedicine #DrGBhanuPrakash #Step1Concepts #MedPrep #Step1Ready #MCQReview #MedSchoolLife #WhiteboardMedicine #HighYieldVascular #USMLEBuzzwords