Angiomyolipoma is a rare mesenchymal neoplasm that is composed of: blood vessels, smooth muscle and fat cells. The kidneys are the site where they can be most commonly located, while the liver is a less common site of origin; these hepatic lesions are often discovered as an incidental finding in the search for diagnostic images for another pathology or are identified in the evaluation of non-specific symptoms. This tumor has been defined as a benign neoplasm, although it is suggested that some cases may have a malignant potential after hepatic resection. The definitive diagnosis is based on pathological findings supported by immunohistochemical staining. The cellular component of smooth muscle is the most specific for the diagnosis and, characteristically, these lesions are positive for homatropine methyl bromide 45 (HMB-45) and Melan-A. Because hepatic angiomyolipomas are rare and have several imaging characteristics that tend to be confused with other tumors due to their very similarity, it is not easy to achieve a definitive preoperative diagnosis, and more than half of patients are misdiagnosed with hepatocellular carcinoma or hepatic adenoma, which are much more common lesions. Regarding the imaging diagnosis of angiomyolipoma; the fatty component can be detected by CT and ultrasound. When the fat content is lower, the magnetic resonance images in weighted and diffusion sequences are useful due to their sensitivity. In fact, magnetic resonance using conventional sequences and weighted by diffusion have become a valuable technique for the characterization of focal solid liver lesions.
Elastofibroma Dorsi is a benign soft tissue tumor, that is rare; commonly located in the scapula, and found more frequently presented in women. Its etiology is unknown, but is mostly associated to the result of mechanical friction between two musculoskeletal surfaces. It is frequently manifestated as an asymptomatic mass, with variable size and location. Its diagnosis is clinical, however there are numerous diagnostic aids, of which the most relevant is magnetic resonance for its ability to characterize the lesion. The differential diagnoses are lipoma, liposarcoma, sarcoma, hemangioma, desmoid tumor and osteosarcoma. Its definite treatment is surgical resection.
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