Purpose or Case Report: The purpose of this educational exhibit is to illustrate the radiological appearance of various ossified soft tissue lesions. The differential diagnosis is wide, with entities ranging from benign to malignant. Using instructive and interesting cases encountered at our department, this presentation will outline an approach to forming a differential diagnosis. Various teaching points will be highlighted. Pathological correlation will be included where available.

The cases to be presented include:
Myositis ossificans
Fibrodysplasia ossificans progressiva
Tenosynovial osteochondromatosis
Dysplasia Epiphysealis Hemimelica
Pseudohypoparathyroidism - Albright’s hereditary osteodystrophy
Phlebolith in a vascular malformation
Pilomatrixoma
Heterotopic ossification
Synovial Sarcoma

This presentation will highlight the distinguishing imaging characteristics of each entity and help narrow the differential diagnosis for a radiologist when faced with a pediatric ossified soft tissue lesion.
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