This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
Babloo a 10-year-old boy presents with # of the humerus. X-ray reveals a lytic lesion at the upper end. Likely condition is 
Select and explain. 
A. Unicameral bone cyst, B. Osteosarcoma, C. Osteoclastoma, D. Aneurysmal bone cyst
A: Unicameral bone cyst
Answer: A: Unicameral bone cyst 
Explanation: Here, two options are there which are included in the differential diagnosis of the lytic lesion in the proximal humerus, i.e., unicameral bone cyst and aneurysmal bone cyst.
We cannot differentiate between two on the basis of information provided in the question.
However, the best option here is a unicameral bone cyst because : -


A pathological fracture is more common in the unicameral bone cyst.
In unicameral bone, cyst patient is asymptomatic and presents only after the occurrence of pathological fracture.
Most common site of unicameral bone cyst is proximal humerus.
A unicameral bone cyst is more common in a male child.


So in this question, the best answer is a unicameral bone cyst. However, the exactly similar presentation may occur in aneurysmal bone cyst also.