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The Deltoid Tuberosity—A Potential Pitfall (The "delta sign") in Bone-Scan Interpretation: Concise Communication

William Beaumont Hospital, Royal Oak, Washington

Correspondence: For reprints contact: D. Fink-Bennett, MD, William Beaumont Hospital, 3601 W. Thirteen Mile, Royal Oak, MI 48072.

ABSTRACT

Evaluation of 100 consecutive technetium methylene diphosphonate bone scintiscans revealed, in seven patients, increased uptake in the upper third of the humeral shaft. Comparison with the radiographs revealed that this corresponded to the presence of a prominent deltoid tuberosity. Though this uptake (the delta sign) is not a common finding, its recognition is important to prevent bone-scan misinterpretations.