RESUMO
We present a non-smoker woman in her 40s with PLCH who presented with atypical imaging findings of multiple pulmonary noncavitary nodules without air cysts with repeated waxing and waning.
Assuntos
Histiocitose de Células de Langerhans , Pulmão , Nódulos Pulmonares Múltiplos , Tomografia Computadorizada por Raios X , Humanos , Histiocitose de Células de Langerhans/diagnóstico por imagem , Histiocitose de Células de Langerhans/complicações , Feminino , Nódulos Pulmonares Múltiplos/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos , Adulto , Pulmão/diagnóstico por imagem , Diagnóstico Diferencial , não FumantesRESUMO
ABSTRACT: We obtained breath-hold zero TE (ZTE) magnetic resonance imaging for the evaluation of pulmonary arteriovenous malformations before and after embolotherapy. To the best of our knowledge, there have been no reports of ZTE for the entire lung imaging in single breath-hold scan time such as 20 seconds. Breath-hold ZTE magnetic resonance imaging can be a useful technique for magnetic resonance-based follow-up of vascular lung diseases without using contrast media, reducing the undesired artifacts from metallic devices.
Assuntos
Fístula Arteriovenosa , Malformações Arteriovenosas , Embolização Terapêutica , Artéria Pulmonar/anormalidades , Veias Pulmonares/anormalidades , Humanos , Estudos de Viabilidade , Imageamento por Ressonância Magnética/métodos , Suspensão da Respiração , Malformações Arteriovenosas/diagnóstico por imagem , Malformações Arteriovenosas/terapia , ArtefatosRESUMO
Zero echo time (ZTE) sequence is recent advanced magnetic resonance technique that utilizes ultrafast readouts to capture signals from short-T2 tissues. This sequence enables T2- and T2* weighted imaging of tissues with short intrinsic relaxation times by using an extremely short TE, and are increasingly used in the musculoskeletal system. We review the imaging physics of these sequences, practical limitations, and image reconstruction, and then discuss the clinical utilities in various disorders of the musculoskeletal system. ZTE can be readily incorporated into the clinical workflow, and is a promising technique to avoid unnecessary radiation exposure, cost, and time-consuming by computed tomography in some cases. LEVEL OF EVIDENCE: 4 TECHNICAL EFFICACY: Stage 1.
Assuntos
Processamento de Imagem Assistida por Computador , Sistema Musculoesquelético , Humanos , Processamento de Imagem Assistida por Computador/métodos , Sistema Musculoesquelético/diagnóstico por imagem , Tomografia Computadorizada por Raios X/métodos , Imageamento por Ressonância Magnética/métodosRESUMO
The spectrum of soft-tissue mass is varied, including neoplastic and nonneoplastic/inflammatory lesions. However, soft-tissue tumors have similar imaging findings and, therefore, the diagnosis of soft-tissue mass is challenging. Although careful assessment of the internal characteristics on imaging can often narrow the differential diagnoses, the differential diagnosis may be out of the question if identification of the soft-tissue mass origin is missed. The purpose of this article is to review the imaging findings and the essential anatomy to identify the primary site of the soft-tissue mass, and discuss the associated potential pitfalls. In order not to fall into a pitfall, recognition of characteristic imaging findings indicating the origin of the soft-tissue mass and anatomical knowledge of the normal tissue distribution are necessary. LEVEL OF EVIDENCE: 5 TECHNICAL EFFICACY STAGE: 3.