RESUMEN
The following case is presented to illustrate the roentgenographic and clinical findings of a condition of interest to the orthopedic surgeon. Initial history, physical findings, and roentgenographic examinations are found on the first page. The final clinical and roentgenographic differential diagnoses are presented on the following pages.
Asunto(s)
Mieloma Múltiple/diagnóstico , Dolor/etiología , Hombro , Diagnóstico Diferencial , Femenino , Humanos , Persona de Mediana Edad , Mieloma Múltiple/fisiopatologíaRESUMEN
A lobulated mass in the suprapatellar bursa of the knee is presented with MRI findings simulating the features of focal pigmented villonodular synovitis (PVS). Microscopic examination demonstrated a nonspecific, inflammatory mass of hypertrophied synovium. The MRI features of various forms of synovitis are reviewed from recent literature and differential considerations of a suprapatellar, intrabursal mass are discussed.
Asunto(s)
Traumatismos de la Rodilla/complicaciones , Imagen por Resonancia Magnética , Sinovitis/etiología , Accidentes de Tránsito , Adulto , Bolsa Sinovial/patología , Humanos , Articulación de la Rodilla/patología , Masculino , Sinovitis/diagnóstico , Sinovitis/patologíaRESUMEN
A case of chronic, nonspecific synovial inflammation presenting as a mass in the pes anserine bursa is demonstrated by MRI. The lesion was well demarcated and surrounded by a low intensity rim. On spin echo images it was homogeneous and of intermediate signal intensity, whereas on T2-weighted images it showed scattered areas of high signal producing a heterogeneous pattern. It is contrasted with a typical example of acute pes anserine bursitis, presenting as simple fluid within the bursa. The differential considerations vary accordingly between the acute and chronic forms of pes anserine bursitis, with the latter requiring differentiation from other forms of synovitis, synovial hemangioma, and synovial sarcoma. The MR features of these entities are reviewed as an aid in differential diagnosis.
Asunto(s)
Bolsa Sinovial/patología , Bursitis/diagnóstico , Rodilla/patología , Imagen por Resonancia Magnética , Bursitis/patología , Enfermedad Crónica , Diagnóstico Diferencial , Humanos , Linfocitos/patología , Masculino , Persona de Mediana Edad , Células Plasmáticas/patología , Tendones/patología , Tibia/patologíaRESUMEN
No cytochrome pigments were detected by difference (reduced minus oxidized) spectroscopy at liquid nitrogen temperature in whole-cell preparations or membrane fractions of Acholeplasma axanthum S273, Acholeplasma equifetale N93, Acholeplasma granularum BTS39, Acholeplasma laidlawii B-PG9, Acholeplasma modicum PG-49, Acholeplasma oculi 19L, Mycoplasma arginini G230, Mycoplasma arthritidis 07, Mycoplasma pneumoniae FH, and Mycoplasma pulmonis JB. All ten Mollicutes species examined contained iron of unknown function (3.0 to 15.3 nmol of iron per mg of protein). Relatively small amounts of acid-labile sulfide were found in all fractions (0.10 to 1.07 nmol of acid-labile sulfide per mg of protein). The data suggest that, as Mollicutes lack cytochrome pigments, they would synthesize most if not all adenosine triphosphate at the substrate level.