title: Anaplastic cutaneous lymphoma mimicking an infection.
abstract: We present a case of a 17-year-old boy who presented with a skin lesion with extension to the soft tissues of the left thigh. On ultrasound, a homogeneous and hypoechoic expansile formation in the subcutaneous tissue was found, measuring 6.5 × 5 × 3.5 cm, with scarce vascularization. Computed tomography showed a low attenuating neoformation with surrounding edema. An inflammatory disorder was the first diagnosis, but the absence of improvement with antibiotics led us to perform magnetic resonance imaging that showed a high signal lesion on T2-weighted imaging and low intensity signal on T1-weighted imaging and surrounding contrast uptake. Positron emission tomography and computed tomography showed uptake of 18F-fluorodeoxyglucose by the lesion. The final diagnosis was anaplastic cutaneous lymphoma.
authors: Radiology Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.
authors: Luciana
authors: L
authors: Barbosa
authors: Pediatric Oncology Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.
authors: Manuel João
authors: MJ
authors: Brito
authors: Pediatric Orthopedic Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.
authors: Inês
authors: I
authors: Balaco
authors: Radiology Department, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.
authors: Maria José
authors: MJ
authors: Noruegas
mesh_terms: D000293:Adolescent; D003287:Contrast Media; D003937:Diagnosis, Differential; D019788:Fluorodeoxyglucose F18; D006801:Humans; D017728:Lymphoma, Large-Cell, Anaplastic / Q000175:diagnosis* / Q000188:drug therapy / Q000209:etiology; D008279:Magnetic Resonance Imaging; D008297:Male; D049268:Positron-Emission Tomography; D012874:Skin Diseases, Infectious / Q000175:diagnosis*; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000188:drug therapy / Q000209:etiology; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media; D019788:Fluorodeoxyglucose F18
keywords: Anaplastic Lymphoma; Computed Tomography; Magnetic Resonance; Positron Emission Tomography; Ultrasound