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CSF cytology and HIV serology were both negative. EMG, however, confirmed the clinical findings of polyradiculopathy. T1W and T2W MRI of the lumbar spine demonstrated diffuse thickening of the nerve roots of the cauda equina, which enhanced following intravenous gadolinium administration (Figs. 1 and 2). No parenchymal involvement was seen.
(A,B) Fine unilateral reticular pattern. (C) Soft tissue mass producing pulmonary artery obstruction. Thickening of the interlobular septa is a common and easily recognized high-resolution computed tomography feature of many diffuse lung diseases. In some cases, it is the predominant radiological finding. This article reviews the spectrum of entities that commonly present with thickening of the interlobular septa as the main radiological feature and establishes a practical approach for the differential diagnosis.