Extra-Osseous Localized Non-Neoplastic Bone and Cartilage Formation (So-Called Myositis Ossificans)

Neurogenic heterotopic ossification in spinal cord injury

“…48 The centripetal pattern of maturation that is seen in the following weeks is the basis of the zone phenomenon described by Ackerman. 66 The zone phenomenon is characterized by a thin outer zone in the surrounding muscle that encloses a broader intermediate zone. In the intermediate zone, areas of immature bone are lined by osteoblasts, while in the outer margins of this zone mature bone forming a well-demarcated outer trabecular rim is already present.…”

Proliferative Myositis: A Rare Pseudosarcoma in Children

“…Of the three, Proliferative Myositis is the least common, with fewer than 100 cases reported in the literature [3].The first three cases were presented in abstract form by Ackerman in 1958 [9]. The disease was subsequently named by Kern, who reported seven cases in 1960 [3].…”

Rapidly growing chest wall mass mimicking a malignant tumor: proliferative myositis

“…The first three cases were presented in abstract form by Ackerman in 1958. [4] The disease was subsequently named by Kern, who reported seven cases in 1960. [5] Enzinger and Dulcey [1] reported the largest series of 33 cases in 1967.…”