Focal myositis of the neck

Focal myositis presenting with radial nerve palsy

“…Focal myositis may be a manifestation of vasculitis 1 or may later show evidence of diffuse spread (polymyositis), 5,14,30 but previously reported cases have not had peripheral nerve symptomatology. [2][3][4][5][6][7][9][10][11][12][13][14][15][16][17][18][19][20][21]23,[25][26][27][28][29][30][31][32] One reported case of focal myositis had calf enlargement secondary to S1 radiculopathy but also had focal inflammation, necrotic muscle fibers, and fiber-type grouping on muscle biopsy. 17 The hypertrophy, therefore, could have been secondary to chronic denervation, and the authors suggested that denervated calf muscles may be predisposed to damage during walking, causing a secondary inflammatory process.…”

“…3,12,18 Several cases have been reported in the literature [1][2][3][4][5][6][7][9][10][11][12][13][14][15][16][17][18][19][20][21]23,[25][26][27][28][29][30][31][32] ; all presented as a localized mass without peripheral nerve involvement. The diagnosis of focal myositis is determined by biopsy of the mass, and the clinical course is variable, with a high rate of spontaneous regression.…”

Inflammatory Myositis: A Rare Differential Diagnosis of a Neck Lump

“…Since then the condition has been reported 33 times, normally involving muscles of the extremities and only 10 times the head and neck musculature: 6 cases involving the sternocleidomastoid muscle [3][4][5][6][7][8], 2 the mylohyoid muscle [9] and 1 in the tongue [10] and the temporalis muscle [11], respectively. It has never previously been reported in the geniohyoid muscle.…”

Desmoplastic squamous cell carcinoma of the tongue simulating myositis or fasciitis

“…Proliferative myositis is a pseudosarcomatous lesion that occurs in an intramuscular location. [2][3][4][5][6][7][8] It is distinguished by its diffusely infiltrative growth pattern and the presence of hyaline giant cells. The lesion is rapidly growing, poorly circumscribed, and generally presents clinically as a fibrotic scarlike process.…”