OCAD MSK

History

54F with suspected rotator cuff tendonitis

Figure 1 for case simple bone cyst ( RID3945 ) — Figure 1

Figure 2 for case simple bone cyst ( RID3945 ) — Figure 2

Figure 3 for case simple bone cyst ( RID3945 ) — Figure 3

Discussion

4 years ago the open MRI demonstrates a centrally located simple cyst in the proximal humeral metaphysis. 2 years later, there is internal ossification, which has remained stable in XR appearance in the current radiographs. I found one reference from JBJS in 79 that describes this as old calcified fibrin coagula in simple bone cysts. Is that a currently accepted explanation? I have seen other subcortical cysts (in the greater tuberosity in association with cuff tendinosis and tear) ossify over time, but I dont know if that is a different mechanism.

Diagnosis

simple bone cyst ( RID3945 )

Hilary Umans, MD

Courtesy

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