Utility of Tc 99m HMPAO SPECT in the early diagnosis of Rasmussen's syndrome.

Neuroradiological examinations are important in the diagnosis of Rasmussen's syndrome (RS), but they frequently result normal in the early phase of the disease. We performed Tc 99m HMPAO SPECT (single photon emission computed tomography) on an 11-year, 5-month-old, right-handed girl, two months since the first seizure. SPECT showed a reduced uptake of HMPAO in the left temporal region despite normal results with magnetic resonance imaging (MRI). After six months, she developed epilepsia partialis continua, neurological signs appeared, and MRI showed cortical atrophy on the left side. SPECT seems to be a useful, inexpensive and diffuse technology able to give information in the early phases of RS useful in the prevention of serious consequences of the disease within a medical therapeutic program (ganciclovir or intravenous immunoglobulins).