INTRODUCTION Many papers have been published recently on the subject of pseudotumors surrounding metal-on-metal hip resurfacing and replacement prostheses. These pseudotumors are sterile, inflammatory lesions within the periprosthetic tissues and have been variously termed masses, cysts, bursae, collections, or aseptic lymphocyte-dominated vasculitis-associated lesions (ALVAL). The prevalence o...

Renal inflammatory lesions rarely present as unilateral solitary mass. These types of lesions are often misdiagnosed as renal tumors that lead to unnecessary nephrectomy. So far there are very few comprehensive studies about both their clinical features and pathologic characteristics of these inflammatory pseudotumors. Six renal inflammatory pseudotumors were identified in atotal of 1195 radica...

BACKGROUND AND PURPOSE Metal artifact reduction sequence (MARS) MRI and ultrasound scanning (USS) can both be used to detect pseudotumors, abductor muscle atrophy, and tendinous pathology in patients with painful metal-on-metal (MOM) hip arthroplasty. We wanted to determine the diagnostic test characteristics of USS using MARS MRI as a reference for detection of pseudotumors and muscle atrophy....

Introduction: A haemophilic pseudotumor is an encapsulated, chronic, slowly expanding hematoma, usually involving the musculoskeletal system. Pseudotumors cause pressure erosion of adjacent bone and other pressure effects. We present a case report of neglected pseudotumors and everything that can go wrong, complicating management so much that we were left with amputation as the only option. We ...

Retro-odontoid pseudotumors are noninflammatory masses formed posterior to the odontoid process. Because of their anatomy, the optimal surgical approach for resecting pseudotumors is controversial. Conventionally, 3 approaches are used: the anterior transoral approach, the lateral approach, and the posterior extradural approach; however, each approach has its limitations. The posterior extradur...

Musculoskeletal pseudotumors on MRI are not infrequent due to the increased availability of MR imaging and expanding clinical referral basis. A large variety of MRI pseudotumors exist. A recent review of seventy-seven patients referred to our ambulatory MRI unit for tumor imaging of the shoulder and upper limb region, showed forty-six ( 60%) were due to pseudotumors. Very commonly a forgotten m...

Unusual MR and CT findings of an inflammatory pseudotumor in the parapharyngeal space of a 73-year-old woman are reported. The mass was hypointense on T1- and T2-weighted images and demonstrated ring enhancement after contrast medium injection. Punctated calcifications were scattered at the periphery. Inflammatory pseudotumors in the parapharyngeal space are rare, and only three cases have been...

Metal-on-metal (MoM) total hip arthroplasty (THA) is associated with increased incidence of failure from metallosis, adverse tissue reactions, and the formation of pseudotumors. This case highlights a 53-year-old female with an enlarging painful thigh mass 12 years status post MoM THA. Radiographs and advanced imaging revealed an atypical mass with cortical bone destruction and spiculation, con...