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Pyomyositis is a pyogenic infection of skeletal muscle that is endemic in the tropics and is being recognized with increasing frequency in temperate climates. We report two cases of nonendemic pyomyositis in patients with diabetes mellitus. A review of the literature suggests that diabetes mellitus may be an important risk factor for the development of pyomyositis. Possible mechanisms of this association are discussed.
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PMID:Pyomyositis in patients with diabetes mellitus. 196 87

Infections of the chest and abdominal wall are rare but potentially fatal disorders that can occur spontaneously or in association with diabetes mellitus, immunosuppression, or trauma. The condition (either in the form of necrotizing fasciitis and/or pyomyositis) is difficult to diagnose clinically because of poor localizing signs. Prognosis depends on early recognition, extent of disease, and type of causative organism. Pathologically, the infections can manifest as cellulitis, abscess, and/or granulation tissue formation. To determine the value of MR imaging in the assessment of these infections, we compared the findings of MR with those of CT, sonography, scintigraphy, and plain radiography in 13 patients with proved thoracic and/or abdominal wall infection. The imaging findings were correlated with microbiological, pathologic, and/or surgical data. The isolated pathogens were Staphylococcus aureus (n = 6), Klebsiella pneumoniae (n = 1), Mycobacterium tuberculosis (n = 4), and Streptomyces somaliensis (n = 2). In 10 of 13 patients, MR imaging and CT were comparable and proved accurate in detecting the nature and extent of the inflammatory process. In seven of the patients, CT also was useful in guiding percutaneous biopsy and/or partial drainage procedures. Coronal and sagittal MR images were helpful for planning surgery. Rib osteomyelitis was missed with both techniques in one patient; in two other patients who did not have CT, MR imaging missed osteomyelitis of the ribs, the spinous process of a vertebral body, and the iliac bone. Sonography underestimated the extent of the disease in all 13 patients, but detected fluid collections in six. Findings on scintigraphy and plain radiography were the least contributory to the diagnosis and treatment of these patients.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:MR imaging of thoracic and abdominal wall infections: comparison with other imaging procedures. 213 43

We describe a case of isolated pectoralis swelling and tenderness, without systemic signs of infection, in a North American adult with diabetes mellitus and rheumatoid arthritis. The etiology was discovered to be pyomyositis, usually thought to be a disease of tropical climates. It is the first such case with group B Streptococcus as the causative organism.
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PMID:Pectoralis pyomyositis: an unusual cause of chest wall pain in a patient with diabetes mellitus and rheumatoid arthritis. 352 99

Staphylococcus aureus infections may occur with greater frequency among patients with diabetes mellitus. This article reviews the available literature as it pertains to diabetes and S. aureus in three categories: colonization/carriage, bacteremia with or without metastatic complications, and dialysis-related infections. The clinical entity of pyomyositis is also discussed.
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PMID:Staphylococcus aureus infections in diabetic patients. 776 12

Pyomyositis (PMS) is a primary infection of striated muscle. Recent scanty reports suggest that non-tropical PMS may differ from classical tropical PMS. To address this question, 12 cases of nontropical PMS seen at two hospitals between 1976 and 1992 were reviewed and an English-literature search of similar cases was conducted. Both the series and reported cases are pooled together and herein reported. The age distribution of the 97 patients showed 30-50 and 60-70-year peaks, with a 3:1 (male-female) ratio. Fever, high erythrocyte sedimentation rate, and muscle stiffness or inflammation were present in more than 75% of patients. Muscles of the thigh (54%), back (13%), buttock (11%), arm (9%), or chest wall (4%) were involved. Staphylococci (61%), gram-negative bacilli (16%), streptococci (12%), and fungi (2%) were isolated from muscle specimens. Human immunodeficiency virus infection, diabetes mellitus, hemopoietic disorders, and other conditions with defective neutrophil function were present in 64 patients (66%). Drainage of pus and antibiotic therapy were the standard treatments. The mortality rate reached 10%. Analysis of patients classified by the comorbid condition showed differences in age, causative microorganisms, clinical features, and death rate. It is concluded that several clinical presentations of nontropical PMS are at variance with that of tropical PMS.
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PMID:Nontropical pyomyositis in adults. 793 25

Pyomyositis is an uncommon infection in temperate climates, usually resulting from Staphylococcus aureus infection of skeletal muscle. In this report, the authors describe a patient with untreated Type 2 diabetes mellitus who suffered nonpenetrating blunt trauma to his left anterior thigh, and S. aureus pyomyositis and secondary osteomyelitis of his proximal tibia and patella subsequently developed as a result of delayed diagnosis and treatment. Patients with diabetes mellitus are at increased risk for the development of pyomyositis because of more frequent S. aureus colonization of skin, nasal mucosa, and oropharynx; a delay in definitive treatment can lead to significant morbidity in these patients. Computed tomography or magnetic resonance imaging may be helpful in the diagnosis of pyomyositis. An anemia of chronic disease may result from this disorder, which resolves with treatment.
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PMID:Case report: diabetes mellitus as a predisposing factor in the development of pyomyositis. 794 86

Four patients meeting the "classical" criteria for spontaneous pyomyositis are reported. No local cause was found. Risk factors included diabetes mellitus (2 patients), hemopathy (one patient), and alcohol abuse (one patient). Causative organisms (Staphylococcus aureus in 3 cases and Salmonella sp in one case) were recovered from blood cultures, an unusual occurrence. CT scan studies ensured the diagnosis in every case. An additional case of pyomyositis due to Staphylococcus aureus illustrates the difficulties in the definition of disease. This patient, whose muscle lesions were remarkably well visualized by MRI with injection of gadolinium, developed infection of the sacro-iliac joint adjacent to the muscular focus of infection. This patient may have had either "primary" pyomyositis with spread to the adjacent joint or "secondary" pyomyositis caused by the joint infection which was recognized only later. Advances in medical imaging techniques suggest that the nosology of pyomyositis should be broadened using this terminology. This would underscore the unique characteristics of "classical", "primary" pyomyositis and emphasize imaging, diagnostic and therapeutic facets of the disease which are shared by both entities.
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PMID:[Pyomyositis. Apropos of 5 cases]. 824 27

A comparative and retrospective trial of 40 patients with tropical pyomyositis covering studies done between January 1, 1987 and November 31, 1990, at the General Hospital at Cosamaloapan, Veracruz, IMSS, was undertaken. The objectives were to compare predisposing factors, clinical data, morbidity, mortaity and hospital stay among 1) medical (group I) and surgical treatment (II), 2) adult and pediatric populations and 3) the clinical stage of the disease (invasive, suppurative and late). In group I, the family history of diabetes (56%), fever (66%) and hospital stay (6.5 +/- 1.8 days) were significantly different from group II (19%, 100% and 12.8 +/- 5.5 days), respectively. The mean age in adult and pediatric populations was 38 and 8 years, respectively. Pediatric patients had lowest hemoglobin levels (9.7 +/- 1.3). Upper respiratory antecedent was highest in suppurative stage (65%). In the late stage eosinophilia (5.9 +/- 6.9), fluctuance muscles (100%), complication rate of 57%, surgical drainage (100%) and mortality of 29% were found. Cultures were performed in 20 cases with negative results in 55% and the remaining 45% were positive to Staphylococcus aureus. Pyomyositis appears to be multifactorial in origin, the antecedents of trauma and upper respiratory infection were the major predisposing factors. Septicemia caused high morbidity and mortality in the late stage. Surgical treatment was frequently needed, increasing costs.
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PMID:Clinical stage, age and treatment in tropical pyomyositis: a retrospective study including forty cases. 869 59

In the past, most cases of pyomyositis occurred among persons living in tropical climates, with the most common pathogen being Staphylococcus aureus. Increased numbers of cases have been reported more recently in North America, particularly in immunocompromised persons, such as those infected with the human immunodeficiency virus (HIV) and those with diabetes mellitus. These patients present with a wider variety of pathogens, including gram-negative bacteria, Streptococcus groups B, C and G, and Mycobacterium avium. Therefore, it seems prudent to consider pyomyositis in the differential diagnosis of persons with HIV infection, diabetes mellitus or other immunocompromising conditions, who present with persistent or worsening muscle aches and pains. Antibiotic treatment with a pencillinase-resistant penicillin is recommended for up to six weeks.
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PMID:Pyomyositis. 910 91

Pyomyositis, an endemic disease of tropical origin, is increasingly reported in temperate zones, especially in patients with diabetes mellitus and in the immunocompromised. A 28-year-old renal transplant recipient presented with perforating skin lesions (Kyrle's disease), thigh pain, and swelling associated with fever. A gallium scan of the thigh led to surgical exploration and a diagnosis of pyomyositis. To our knowledge, the association of Kyrle's disease with pyomyositis has not been reported before. The significance of this combination of conditions in our patient remains unexplained.
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PMID:Pyomyositis in a renal transplant patient with Kyrle's disease. 885 70


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