Journal of Pathology and Translational Medicine

Case Reports

Fine Needle Aspiration Cytology of Myositis Ossificans: A Case Report.: Dong Won Kim, Dong Wha Lee; Korean J Cytopathol. 1998;9(1):123-128.

Abstract PDF: The aspiration cytologic finding of myositis ossificans is not well documented but similar to that seen in nodular fasciitis except less cellularity. Myositis ossificans is a reactive condition that is sometimes mistaken microscopically for extraosseous osteosarcoma. Cytologically, myositis ossificans may be distinguished from extraosseous osteosarcoma by the presence of uniform benign stromal cells composed of mature fibroblasts and osteoclastic giant cells. However, the differential diagnosis may be difficult in the early stage of this reactive and proliferative process. We recently experienced a case of myositis ossificans. The patient was a 67-year-old woman with painful swelling of the left index finger for one month. Simple x-ray finding showed a soft tissue mass with calcific center at middle phalanx of the left hand. Fine needle aspiration cytology revealed a few individual or clusters of spindle cells in dense eosinophilic stroma with osteoclastic giant cells. The spindle cells were uniform, smooth-bordered, and oval nuclei with single small inconspicuous nucleoli, and elongated cytoplasm. The scattered individual cells had eccentric nuclei with one or two nucleoli and abundant, basophilic cytoplasm.

Heterotopic Mesenteric Ossification: A Case Report.: Hoon Kyu Oh, Jong Yup Bae; Korean J Pathol. 2006;40(1):70-72.

Abstract PDF: Heterotopic mesenteric ossification is a very rare reactive lesion in the small bowel mesentery, and it is related with trauma or surgical operation. It is pathologically characterized by well formed bone trabeculae and prominent osteoblastic rimming and is clinically related to rapid and recurrent bowel obstruction symptoms. This unusual reactive process shares many clinical and pathologic features with myositis ossificans. We report here on a rare case of heterotopic mesenteric ossification in 28-year-old man who underwent a delayed small bowel resection 15 days after trauma.

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