The normal biodistribution of Tc-99m pertechnetate includes the thyroi
d gland, salivary glands, choroid plexus, and gastric mucosa. The prim
ary route of excretion is through renal clearance, The authors describ
e two cases in which hepatobiliary excretion of intravenously administ
ered Tc-99m pertechnetate was observed during scanning for Meckel's di
verticulum as a possible source of gastrointestinal bleeding.