Solitary bone cysts:
- A- Are always unilocular. True
- B- Occur under the age of 20Y in 90% of cases. True
- C- Present with pathological fractures. True
- D- Most commonly affect the proximal femur... False (Proximal humerus then the proximal femur).
- E- Cause periosteal reaction in the absence of a fracture… False (Periosteal reaction is not seen in the absence of fracture).
Here's a breakdown of the statements about solitary bone cysts:
A. Are always unilocular.
True. Solitary bone cysts are characterized by a single, fluid-filled cavity within the bone.
B. Occur under the age of 20Y in 90% of cases.
True. Solitary bone cysts typically arise in children and adolescents, with the majority of cases presenting before the age of 20.
C. Present with pathological fractures.
True. Solitary bone cysts can weaken the affected bone, making it susceptible to fracture even with minimal trauma. These fractures are known as pathological fractures.
D. Most commonly affect the proximal femur.
False. Solitary bone cysts show a predilection for the proximal humerus, the upper end of the humerus bone in the arm. While they can also occur in the proximal femur, the humerus is the more common site.
E. Cause periosteal reaction in the absence of a fracture.
False. Periosteal reaction, a thickening of the bone's outer layer, typically occurs in response to an injury or inflammation. Solitary bone cysts, in the absence of a fracture, are not associated with periosteal reaction.
Therefore, the correct statements are A, B, and C.
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Radiology MCQ