Presentation
Focal swelling at distal left arm. No pain and tenderness.
Patient Data
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Cortical thickening in the proximal humerus deltoid insertion accompanied by intracortical lucency. Intramuscular lucent lesion is also seen adjacent to distal third of humerus suggestive of lipoma (confirmed with ultrasound)
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Cortical thickening in the proximal humerus deltoid insertion accompanied by intracortical lucency. Yellow arrow shows intramuscular lucent lesion adjacent to distal third of humerus suggestive of lipoma (Lipoma is confirmed with ultrasound at the site of swelling pointed by the patient)
Case Discussion
Pseudotumor deltoideus (prominent deltoid muscle insertion) is an anatomical variant which can be confused with bone neoplasms. Complaint and radiographic changes in this location may lead to misdiagnosis by those unfamiliar with this anatomical variant. Well-defined borders and the typical location on the lateral aspect of the humerus at the level of deltoid insertion can help make the diagnosis and differentiate from a neoplasm.
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