Note tracer activity in the skull and scalp but not in the nervous system tissue, due to the fact that Thallium Chloride does not cross the hemato-encephalic barrier, when it is normal. In the left side spect coronal slice. In the right side the planar  image as seen from the right lateral projection.

References:

Abos MD and Quintana J.C. Tumores Cerebrales:SPECT, p: 471-480 in: Medicina Nuclear Aplicaciones Clínicas. Eds: I. Carrio - P. González. Editorial Masson, Barcelona España, 2003.

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