Self-resolving focal non-ossifying myositis: a poorly known clinical and imaging entity diagnosed with MRI (original) (raw)
Related papers
MR imaging findings of focal myositis: a pseudotumour that may mimic muscle neoplasm
Skeletal Radiology, 2009
Objective The authors describe magnetic resonance (MR) findings in eight patients with histologically confirmed focal myositis. Materials and methods In each patient, axial TSE T1weighted and fast short-tau inversion recovery (STIR) images were obtained using a 1.5-T MR scanner. Three patients also underwent dynamic contrast-enhanced MR examination using a GE T1-weighted sequence. The following features were evaluated: anatomical distribution, extent of the involvement, signal intensity characteristics, dynamic enhancement pattern and outcome at follow-up examinations.
Myositis ossificans imaging: keys to successful diagnosis
Myositis ossificans (MO) is an inflammatory pseudotumor of the muscle that may be mistaken clinically and even histologically for a malignant soft tissue tumor. The aim of this article is to report the imaging characteristics of MO, the emphasis being on the early diagnostic clues. USG can be used at an early stage to reveal the 'zone phenomenon,' which is highly suggestive of MO. A short course of nonsteroidal anti-inflammatory drug therapy may be an efficient treatment for early MO.
Myositis Ossificans - Mri and CT Findings
Journal of Morphological Sciences, 2020
Myositis ossificans (MO) is a benign, self-limiting process that results in intramuscular bone proliferation. We report a case of a 16-year-old male who presented with a painless mass on the left arm and an increasing lump, without a history of trauma. Plain CT and MRI with contrast exams were done. The mass was extirpated and biopsy was done. Histopathological findings referred to the diagnosis of myositis osificans.
Focal myositis of the thigh: report of two cases
Acta Neurologica Scandinavica, 2009
Focal myositis is a benign inflammatory pseudotumor of skeletal muscle, presenting as a localized painful swelling within the soft tissue of an extremity. Histological examination reveals lymphocytic infiltration, scattered muscle fiber necrosis and regeneration, and interstitial fibrosis. Complete recovery follows surgical removal of the lesion. Two cases are presented of young active males with a localized painful swelling of the thigh. Clinical examination, standard laboratory tests, electromyography (EMG), magnetic resonance imaging (MRI) and surgical biopsies were performed. Surgical biopsies were formalin-fixed, paraffin-embedded and sections were stained with hematoxylin and eosin, van Gieson, modified Gomori trichrome and Mallory's method for iron. Clinical examination in both cases revealed an indolent lump in the quadriceps femoris muscle. Standard laboratory tests and electromyography were normal. MRI prior to surgery visualized the focal nature of the lesions. Histological examination of repeated surgical biopsies showed scattered muscle fiber necrosis, regeneration, and interstitial fibrosis but few lymphocytes. Both patients recovcrcd after surgical removal of the lesion. Two years after surgery there was no recurrence of the lesions and repeated EMGs were normal.
Focal myositis: a rare case report
Turkish Journal of Physical Medicine and Rehabilitation
Focal myositis is an uncommon, self-limiting, benign skeletal muscle disease, which is generally identified as an inflammatory pseudotumor. It was first described by Heffner et al. [1] in 1977. The disease occurs over a wide age range of 7-94 years (mean 41 years) and there is equal involvement between both sexes. It generally occurs in the lower extremities. Atypical localization of lesions has been shown in the neck, tongue, hand, and eyelid and paraspinal muscle. [2-5] As it leads to a tumoral mass, there may be confusion between several diseases leading to incorrect evaluations. [6]
Magnetic resonance imaging helps in the early diagnosis of myositis ossificans in children
Pediatric Surgery International, 1999
Two cases on myositis ossificans circumscripta (MOC) in the arm are reported. Plain X-ray films and magnetic resonance imaging (MRI) were performed in both cases. In the first, an intramuscular tumor-like mass without calcifications was found on MRI with soft-tissue edema extension. In the second, MRI disclosed additional bone-marrow edema. The diagnosis of MOC was confirmed by biopsy in one case and by follow-up in the other. MOC is a benign soft-tissue lesion that is rare in children, with an acute course and usually spontaneously favorable evolution. The differential diagnosis from an infection or a malignant tumor remains difficult. The best imaging modalities are conventional radiography and MRI. The MRI patterns of MOC are typical but not pathognomonic; typical MRI findings in conjunction with clinical symptoms during the early phase of MOC permit the postponement of a biopsy or aggressive surgical procedures. Surgery is indicated for cases not showing typical MOC calcifications at a later stage.
Skeletal Radiology, 1992
Myositis ossificans is a relatively rare, well-defined entity. The 23 cases sent for consultation to two of us (L.V.A. and A.N.) were reviewed. Clinical, radiologic, and microscopic information was reexamined, and special attention was given to features infrequently seen in typical myositis ossificans. Average age at presentation was 23 years, but 1 patient was younger than 2 years, and 2 were younger than 10 years. Due to the uncommon location of 15 lesions and an unusual presentation in 5, the correct diagnosis was not obvious in these cases. A history of trauma was elicited in 8 patients, denied by 7, and was not queried in the remainder. Radiologic studies raised the possibility of a malignant bone-forming tumor in at least three instances; myositis ossificans was originally diagnosed in 6 cases radiologically. In 8 cases, histologic evidence suggested malignancy, including osteosarcoma, either parosteal or extraosseous, in 6. Other diagnoses included epithelioid sarcoma and callus formation. Presentation of these variations from the norm highlights the importance of recognizing the evolution of a nonneoplastic fibro-osseous and cartilaginous entity in which conservative treatment is curative.
MRI of myositis and other urgent muscle-related disorders
Emergency Radiology, 2020
Myositis has many etiologies, and it can be encountered in the acute or chronic setting. Our goal is to increase the radiologist's knowledge of myositis and other urgent muscle disorders encountered in the emergent or urgent setting. We review the clinical presentation, the MRI appearance, and the complications that can be associated with these entities. Since myositis can affect multiple muscle compartments, we review how to differentiate the compartments of the appendicular skeletal in order to generate reports that relay important anatomic information to the treating physician. Given the poor sensitivity and positive predictive value of the clinical signs and symptoms used to diagnosing acute compartment syndrome, we discuss the potential use of MRI in cases of suspected but clinically equivocal compartment syndrome in the future.
Proliferative Myositis: A Comprehensive Review of 33 Case Reports
Ramathibodi Medical Journal, 2019
Proliferative myositis, a rare reactive intramuscular myofibroblastic proliferation, is not well recognized in clinical practice. It overgrows within a few weeks and expands the space between the muscle causing infiltrative-like border mimicking sarcoma. Knowledge of the natural history and pathology of proliferative myositis is essential in order to prevent misdiagnosis and unnecessary surgical resection. Thirty-three reported cases of proliferative myositis in PubMed and Web of Science databases from 2000 to 2018 had been reviewed with the main emphasis in clinical presentation, radiological and pathological findings, treatment, and prognosis. Both males (19 cases) and females (14 cases), predominantly the middle-aged and senior adults, were affected. Upper extremity and shoulder girdle were commonly involved. The chief complaint varied from either painful or painless mass. The traumatic injury was reported as a significant predisposing factor. The lesion typically proliferated an...