A patient with malignant pleural mesothelioma was investigated using Tl-201
scintigraphy. There was diffuse pleural tumour accumulation on planar scin
tigraphy. Single photon emission computed tomography (SPECT) demonstrated e
xact tumour location. It is concluded that planar scintigraphy using Tl-201
may be useful in detecting mesothelioma, Clearer tumour localization is po
ssible with SPECT.