title: Case report. Aortic aneurysm presenting as psoas enlargement.
abstract: We present a case of abdominal aortic aneurysm in which erosion and bleeding into the psoas muscle caused enlargement of that structure but remained confined within it until needle biopsy produced communication with the extraperitoneal space. This confirms the observation that separate compartmentalization of retrofascial and extraperitoneal spaces normally maintains.
mesh_terms: D001012:Aorta, Abdominal; D001019:Aortic Rupture / Q000000981:diagnostic imaging* / Q000473:pathology; D001706:Biopsy / Q000009:adverse effects; D003937:Diagnosis, Differential; D006406:Hematoma / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000473:pathology; D011859:Radiography