CT features of traumatic bone cyst

Objective: To study the CT findings of traumatic bone cyst and to improve the knowledge of that disease. Methods: CT features of 8 cases of traumatic bone cyst confirmed by clinical and pathology were reviewed retrospectively. There were 4 females and 4 males, from 26 to 76 years (the median age was 53 years old) of age, Three patients had traffic accidents, 2 patients had trauma unrelated, 1 patient had boulder crushing, 1 had patient stick wounded and 1 patient had high jump wounding. The bone cyst occurred from 18 to 36 months after trauma (2 at 18 months, 4 at 24 months, 1 at 30 months and 1 case at 36 months). Results: There were 6 fractures, 1 joint dislocation and 1 frontal soft tissue hematoma in trauma. The cyst located in the ilium of 3 cases, in the calcaneus of 2 cases, in the frontal bone of 1 case, in the hooked bone of 1 case, in the lunate bone of 1 case. The cyst size was 2.0 cm × 2.6 cm to 3.0 cm × 6.0 cm (average 2.7 cm × 4.0 cm). 8 cases all single capsule change, all clear boundaries. 6 cystic destruction and 2 cystic expansion destruction of bone. Two see separated and 6 no divider of the cyst region. Five bone sclerosis and 3 no hardening of the cyst edge. Three sclerosis and Five no sclerosis of the adjacent bone. Four osteoporosis decalcification and 4 no osteoporosis decalcification of he adjacent bone. Conclusion: The traumatic bone cyst is closely related to trauma, CT manifestations with certain characteristics, combined with a history of trauma can make a definite diagnosis. (authors)