BACKGROUND Pseudotumors associated with metal-on-metal hips can be symptomatic or asymptomatic. The purpose of this study was to identify the characteristics of pseudotumors associated with pain. METHODS A total of 239 large-diameter, metal-on-metal total hip arthroplasties (THAs) were performed in 222 patients. Screening for pseudotumors was performed using magnetic resonance imaging (MRI) i...

BackgroundMetal-on-metal (MOM) surfaces in total hip arthroplasty (THA) have been used widely. Serum cobalt and chromium levels the standard investigation for follow-up examinations, but magnetic resonance imaging (MRI) with metal artifact reducing sequences has shown good results detecting pseudotumors. The aim of this study is to survey a significant correlation among MRI findings, serum leve...

UNLABELLED Inflammatory pseudotumors may be defined as lesions that clinically and radiologically simulate neoplasms. These tumor are not a single clinical-pathological entity, but rather a generic term applied to any nonspecific, chronic, inflammatory expanding lesion. There are few reports of inflammatory pseudotumors in the nasal cavity and paranasal sinuses. CASE REPORT We report three ca...

BACKGROUND AND PURPOSE Ultrasound is used for imaging of pseudotumors associated with metal-on-metal (MoM) hips. Ultrasound has been compared with magnetic resonance imaging, but to date there have been no studies comparing ultrasound findings and revision findings. METHODS We evaluated the sensitivity and specificity of preoperative ultrasound for detecting pseudotumors in 82 patients with M...

CONTEXT Hemosuccus pancreaticus is a rare source of gastrointestinal bleeding, the most frequent cause of which is pancreatitis, followed by tumors, but nearly all these tumors are true neoplasms, and not pseudotumors. Furthermore, nearly all pseudotumors of the pancreas and retroperitoneum are inflammatory. CASE REPORT We present a case of hemosuccus pancreaticus associated with a nonneoplas...

BACKGROUND Tissue necrosis and a macrophage and perivascular lymphocytic infiltrate are commonly seen in periprosthetic tissues around metal-on-metal hip resurfacing implants, including pseudotumors associated with these implants. The purpose of the present study was to correlate pathological changes in periprosthetic tissues with clinical findings and the amount of implant-derived metal wear. ...

BACKGROUND AND PURPOSE Magnetic resonance imaging (MRI) is important for detecting extracapsular pseudotumors, but there is little information on the accuracy of MRI and appropriate intervals for repeated imaging. We evaluated the sensitivity and specificity of MRI for detecting pseudotumors in 155 patients (167 hips) with metal-on-metal (MoM) hip arthroplasties that failed due to adverse react...

Calcifying fibrous pseudotumors are rare soft-tissue lesions pathologically characterized by hyalinized collagen, psammomatous or dystrophic calcification, and lympho-plasmacyte infiltration. They are clinically benign with an extremely low rate of recurrence and complete surgical resection is known to be the treatment of choice. We performed the resection of a calcifying fibrous pseudotumors i...

Hepatic pseudolesions and pseudotumors of the third inflow area are sometimes encountered on imaging. Generally, differentiating these lesions of true hepatic neoplasm on radiological examinations is easy with the knowledge of common sites in the liver and characteristic indications of these lesions. However, they occasionally mimic hepatocellular carcinoma in various imaging modalities. In thi...

Haemophilic pseudotumors are very rare, encapsulated haematomas forms as a result of repetitive bleeding, forming mass clotted blood and necrosed tissue. Reported experience in the literature is limited to case reports series from around world, reporting on smaller medium sized pseudotumors. Conflicting opinion exists following failed medical management, which includes minimally invasive interv...