Case Report
Year: 2021 | Month: February | Volume: 11 | Issue: 2 | Pages: 105-108
Myositis Ossificans of Masseter Muscle: A Rare Case
Anshika Rai1, Hoogar M.B.2, Shilpi Sahu3
1Junior resident, 2Associate Professor, 3Professor and Head of Department,
Department of Pathology, MGM Medical College, Navi Mumbai, Maharashtra
Corresponding Author: Anshika Rai
ABSTRACT
Myositis ossificans (MO) is a benign, localized, reactive lesion, commonly affecting the extremities of younger population. Its involvement of the masticatory muscles is rare. The present case elaborates the histopathology of myositis ossificans and its clinical correlation. A 32-year-old-male, presented with trismus and past history of trauma. On clinical examination, a well-defined, tender, hard swelling over the right cheek was noted. Contrast enhanced CT scan suggested ossified right masseter muscle. Gross examination showed multiple grey-white, firm to hard tissue bits and the microscopy revealed residual degenerated muscle fibres undergoing diffuse fibrosis surrounded by spicules of woven bone, along with focal areas of lamellated, uncalcified bone. Spicules of lamellar bone with well-formed medullary cavity containing haematopoietic elements were also noted. Myositis ossificans of masseter is a rare entity causes trismus, leading into reduced quality of life. A clinical suspicion and detailed histopathological examination can help guide the treatment.
Key words: Myositis Ossificans, masseter, trismus, masticatory muscles.