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Visualization of Nonvascular Cranial Tumor in Cerebral Flow Study: Case Report

Michael Reese Hospital and Medical Center, University of Chicago, Pritzker School of Medicine, Chicago, Illinois

Correspondence: For reprints contact: U. Yun Ryo, Div. of Nuclear Medicine, Michael Reese Medical Center, 29th St. and Ellis Ave., Chicago, Ill. 60616.

ABSTRACT

Unusual results were obtained from a cerebral blood flow study and a brain scan performed on a patient with an uncommon, nonvascular scalp tumor eventually identified as a proliferating trichilemmal cyst with acanthosis. The tumor accumulated the radionuclide during the early phase of the cerebral flow study, and the increased radioactivity was persistent, being prominently observable in a scan made 3 min and 2 hr after the radionuclide injection. This unusual, positive finding in a cerebral blood flow study of a nonvascular tumor was thought to be a consequence of the higher counting efficiency resulting from the lack of shielding by the skull and from the larger volume of the tumor tissue.