" A well-defined lytic process is seen in the greater tuberosity, which was thought to represent a lytic lesion. This patient was symptomatic and had increased radionuclide uptake on an isotope bone scan. However, this is a characteristic location and appearance for a pseudocyst of the humerus, which merely represents decreased cortical bone in this region. This becomes more pronounced when pain in the shoulder is present and hyperemia or disuse osteoporosis occurs. "
~from Fundamentals of Diagnositic Radiology

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