A 24 year old man with no clinical history

 

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Doctor's Information

Name : Morteza
Family :Sanei Taheri
Affiliation : ----------------
Academic Degree: ----------------
Email : This email address is being protected from spambots. You need JavaScript enabled to view it.
Resident : Soudeh Jorjani

 

Patient's Information

Gender : Male
Age : 24

 

Case Section

Muskuloskeletal System

 

Clinical Summary

A 24 year old man with no clinical history

 

 

Imaging Procedures and Findings

Central cystic lesion with internal septation in the proximal shaft of the humerus is visible

 

Discussion

Solitary bone cysts are also called simple bone cysts or unicameral bone cysts. They are not necessarily unicameral (one compartment), however. This is the only lesion in FEGNOMASHIC that is always central in location. Many of the other lesions may be central, but a solitary bone cyst can be excluded if it is not. It is one of the few lesions that does not occur most commonly around the knees. Two thirds to three fourths of these lesions occur in the proximal humerus and proximal femur. Application of this rule alone is not that helpful, or one third to one fourth of lesions would be missed. Solitary bone cysts are usually asymptomatic unless fractured, which is a common occurrence. Even when pathologic fractures occur, they rarely form periostitis. A classic radiographic finding for a solitary bone cyst is the fallen fragment sign. This occurs when a piece of cortex breaks off after a fracture in a solitary bone cyst, and the piece of cortical bone sinks to the gravity-dependent portion of the lesion. This has not been described in any other lesion and indicates a fluid-filled cystic lesion, rather than a lesion filled with matrix. Solitary bone cysts occur almost exclusively in young patients (under age 30). Although long bones are most commonly involved, solitary bone cysts have been described in almost every bone in the body. They begin at the physeal plate in long bones and grow into the shaft of the bone; therefore, they are not epiphyseal lesions. They can, however, extend up into an epiphysis after the plate closes, but this is unusual.

 

Final Diagnosis

Unicameral Bone Cyst

 

References

Brant WE, Helms CA. Fundamentals of Diagnostic Radiology, 3rd edition

 

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