Multiple myeloma showing increased accumulation of Tc-99m hexamethylpropylene amine oxime on brain SPECT.
The authors report a case of multiple myeloma with increased accumulation of Tc-99m hexamethylpropylene amine oxime (HMPAO) on brain SPECT. Tc-99m HMPAO is a lipophilic compound that freely passes through the intact blood-brain barrier and cell membrane and is rapidly converted to a hydrophilic form by glutathione and then retained in the neuron for several hours. In general, Tc-99m HMPAO shows decreased accumulation in brain tumors. However, some reports of increased accumulation in brain tumors, such as meningioma, glioblastoma multiforme, high-grade astrocytoma, pituitary adenoma, and multiple myeloma, have been published. The Tc-99m HMPAO uptake in these tumors has been attributed to tumor blood flow or glutathione contents within the tumor. With regard to uptake to Tc-99m HMPAO in multiple myeloma, the tumor size is considered to be an additional factor.
Takeshita
T
T
Department of Radiology, Teikyo University School of Medicine, Tokyo, Japan.
Kaminaga
T
T
Kikuchi
Y
Y
Furui
S
S
D001812:Blood-Brain Barrier; D001932:Brain Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D006801:Humans; D008875:Middle Aged; D009101:Multiple Myeloma / Q000000981:diagnostic imaging* / Q000473:pathology; D019275:Radiopharmaceuticals; D019690:Technetium Tc 99m Exametazime; D015899:Tomography, Emission-Computed, Single-Photon
D019275:Radiopharmaceuticals; D019690:Technetium Tc 99m Exametazime