Myositis Ossificans of Masseter Muscle: A Rare Case (original) (raw)
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Myositis Ossificans of Masseter Muscle - A Rare Case Report
Acta Scientific Dental Scienecs, 2022
Myositis ossificans traumatica (MOT) is a non-neoplastic, heterotopic bone growth within muscle or fascia that is thought to be caused by acute trauma, but it can also be caused by a variety of other factors. A 14 year-old boy presented with progressive limitation of mouth opening over the period of one month. Computed tomography revealed multiloculated cystic lesion seen overlying outer cortex ramus of left mandible and peripheral rim calcification at deeper fibers of left masseter muscle, and also thin solid periosteal reaction seen in adjacent to outer cortex of left ramus of mandible. Since 1924, only 52 occurrences of MOT of the masseter muscle have been described in the English literature. The major treatment option is surgical excision of the ossification, with ongoing postoperative monitoring to prevent relapse.
Circumscribed Myositis Ossificans of Masseter Muscle causing trismus
ENT SCHOLAR, 2014
This article discusses an interesting case report of circumscribed myositis ossificans of masseter muscle causing trismus with a review of literature on this subject. This rare disorder is characterised by dystrophic calcification leading on to heterotopic ossification (presence of bone tissue where it is not usually present) of intramuscular connective tissue. Muscles of mastication are commonly involved in this condition.
MYOSITIS OSSIFICANS – A CASE REPORT AND REVIEW OF LITERATURE
Associated with abnormal bone formation with various localizations, myositis ossificans is both a diagnostic and a therapeutic challenge due to its rare occurrence and clinical presentation. We examined a case of a 14 year old male patient who was diagnosed with the clinical suspicion of myositis ossficans. Contrast substance MRI revealed the presence of a strictly intramuscular mass located in the 1/3 proximal area of the left thigh, at the level of the vastus lateralis muscle. Macroscopic examination of the specimens revealed multiple, irregular tissue fragments, forming a mass of about 5,5/6/1,2 cm. Additional immunohistochemical analysis was made using the following panel of markers: SMA, Vimentin, Desmin, protein S100, NSE and GFAP. Vimentin was intensely positive in osteoblasts, partially in osteocytes, in the stromal fibroblasts/fibrocytes, in adipocytes and in the vascular wall, in endothelial and smooth muscle cells. GFAP and NSE were negative.
Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology, 2013
Myositis ossificans is ossification and bone formation within muscle. It is a rare and unusual pathologic entity that has defied most efforts to establish definite etiology, pathogenesis, and satisfactory treatment. Myositis ossificans is mainly of 2 types: myositis ossificans progressiva (MOP) and myositis ossificans traumatica (MOT). Myositis ossificans idiopathic is also reported in the literature. When it affects the muscles of mastication, it causes severe trismus. Computed tomography scans and magnetic resonance imaging can effectively delineate the calcified mass. In this article, we present a case of MOT of the medial, lateral pterygoid, and contralateral temporalis muscles.
Myositis Ossificans: A Case Report
East and Central African Journal of Surgery, 2006
is classified into three types: progressive, post-traumatic and paraplegic. The progressive form, myositis ossoificans congenita, is a hereditary disease which is usually autosomal dominant or an isolated mutation and more common in boys 1. It is a benign non-neoplastic, heterotopic bone formation in the muscle or soft tissue. The lesions are predominantly localized at high-risk sites of injury, such as the thigh, buttocks, elbow, and less often, the shoulder and calf 2,3. However, myositis ossificans can occur almost anywhere in the body, even in the sternocleidomastoid muscle, paravertebral area, and the muscle of the chest wall 4,5,6. Posttraumatic myositis results in a soft tissue mass which ossifies with a lacy pattern by 4-8 weeks. Paraplegic myositis develops in paraplegics within 3-4 weeks below the level of the paralysis where heterotopic periarticular calcification and ossification are found 1 .
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.
Myositis ossificans: a short review
Health, Sports & Rehabilitation Medicine, 2021
Myositis ossificans (MO, heterotopic ossification) consists of lamellar bone formation in soft tissues, without ossification properties under physiological circumstances. MO can be primary (isolated or associated with various congenital disorders) or secondary in the site of a pre-existing lesion, such as inflammation, a neoplasm or a benign tumor. Primary forms are rare, present systemic symptoms and usually have a worse prognosis. MO is relatively frequent after sports lesions, hip arthroplasty or central nervous system injuries. Posttraumatic MO complicates about 20% of large hematomas after muscle contusions and strains. Diagnosis can be made through imaging or histopathological methods. Although characteristic features can be distinguished on simple radiographic images, magnetic resonance imaging, computed tomography and ultrasonography provide diagnosis in the earlier stages. Despite MO not having a universal prophylaxis or treatment, nonsteroidal antiinflammatory drugs proved to be efficient in certain forms, while surgical excision and extracorporeal shock wave therapy might be useful therapeutic options.
Myositis Ossificans of the Medial Pterygoid Muscle
Journal of Craniofacial Surgery, 2010
Myositis ossificans (MO) is a disease whose main feature is the formation of heterotopic bone involving muscle or any other soft tissue. Pathogenesis is not all clear, but trauma is universally recognized as a trigger event. Myositis ossificans can be divided into 2 classifications: MO progressiva and MO traumatica. The authors present a case of a 64-year-old man who was diagnosed with MOT of the left medial pterygoid muscle. The patient had a long clinical history of signs and symptoms of temporomandibular articulation related to previous conditions, and no major traumatic events were reported, apparently related to MOT.
Myositis Ossificans of the Temporalis Muscle. Case Report
2016
The authors report an unusual case of myositis ossificans in the temporal muscle manifesting as grave opening limitation of the mouth and a hard firm mass in the right temporal fossa. CT scan examination revealed a bone density mass located in the region of the right temporal fossa, that fussed the right temporal bone with the right coronoid process and a joint-like image in the middle portion of this mass. Traumatic myositis ossificans is a pseudotumor-like benign disease most frecuently found in extremities of young population. Cases in the craneofacial skeleton are rare. The masseter and sternocleidomastoid muscles are most commonly affected in this location. The clinicopathological features of scalp myositis ossificans may mimic other soft tissue tumors, requiring care for the differential diagnosis. Histologically, osteoblastic activity is sometimes observed, similar to an osteosarcoma. Then differential diagnosis between both entities must be established.