title: Organizing hematoma mimicking brain tumor.
abstract: A 64-year-old man was referred to our hospital with progressive loss of function in his right upper and lower extremities. Unenhanced computed tomographic showed a high-density nodular lesion in the left basal ganglion with surrounding hypoattenuation. Brain magnetic resonance imaging demonstrated a predominantly cystic mass with multiple internal septa and an eccentric solid component showing enhancement. Histological examination revealed organizing blood clot and piloid gliosis. This unusual appearance of a mass-like organizing blood clot should be considered in the differential diagnosis when an encapsulated cystic mass with nodular component following the signal characteristics of old blood on MRI is encountered.
authors.affiliation: The Russell H. Morgan Department of Radiology, The Johns Hopkins Medical Institutions, Phipps B-100F, Baltimore, MD 21287, USA. ailica1@jhmi.edu
authors.forename: Ahmet Turan
authors.initials: AT
authors.lastname: Ilica
authors.forename: Fausto
authors.initials: F
authors.lastname: Rodrigues
authors.forename: Fernando
authors.initials: F
authors.lastname: Maluf
authors.forename: Nafi
authors.initials: N
authors.lastname: Aygun
mesh_terms: D001932:Brain Neoplasms / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D020198:Intracranial Hemorrhage, Traumatic / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed / Q000379:methods*