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Objective This retrospective study was undertaken to highlight clinical and magnetic resonance imaging features of myxoinflammatory fibroblastic sarcoma. Methods The clinical records of 29 patients (14 men and 15 women) were analyzed. Results The soft tissue tumors involved hand, wrist, foot and ankle in 21 patients, more proximal extremities in 7 patients, and neck in 1 patient. The tumors were subcutaneous in 11 patients, and intramuscular in 15 patients. On magnetic resonance imaging, these tumors had nonspecific features suggestive of benign and malignant lesions. An unusual tumor in hand indicated infection, whereas an intraarticular knee tumor mimicked pigmented villonodular synovitis. All tumors were surgically resected. Conclusions Myxoinflammatory fibroblastic sarcoma, a rare low-grade subcutaneous soft tissue tumor of distal extremities with high local recurrence after resection can mimic several benign and malignant lesions on histopathology and imaging. Rarely, it can arise in muscles and tendons, occur in nonacral sites, be aggressive, and even metastasize. In most cases, surgical resection with wide margins can be curative with low local recurrence.

We present a rare osteochondroma, which instead of being the usual exophytic growth outside bone, grew inward into the medullary cavity of distal femur in a patient with prior trauma to his knee. Except for its intramedullary location, the benign tumor had all the classic radiographic and pathologic features of typical osteochondroma.

Spontaneous hip dislocation due to intraarticular neurofibroma in patients with neurofibromatosis type 1 is extremely rare. We describe the imaging features of spontaneous dislocation of hip due to histologically proven intraarticular neurofibroma in young woman with neurofibromatosis type 1, and review the literature.