seen at around 30 min. Phase 3. During the excretion phase there is a movement of radioactivity from the large salivary glands to the oral cavity. This phase becomes prominent after about 30 min. The uptake of the isotope within a tumor may have one of three appearances relative to the surrounding normal salivary gland parenchyma: "cold" i. e. less uptake than normal, "warm" i. e. about similar uptake as normal and "hot" i. e. increased accumulation as compared with normal gland tissue. Tumors which are "cold" or "warm" may either be benign or malignant. Those nodules consistently reported as "hot" are benign adenolymphomas and oxyphilic adenomas. Four patients with salivary gland tumors are discussed. 9 references. Hakan Hakansson, Malmo

Salivary gland scintiphotography. H. A. KRAAIJENHAGEN, G. A. K. HEYDENDAL and G. M. VAN DER ENT (Dept. Oral Surg., Rad.-Chem. Dept., Hosp, Free Univ. Amsterdam and Rad.-Chem., Dept., Bethesda Hosp., Hoogeveen, The Netherlands). Int. 7. Oral Surg. 3(5) :326-329, 1974. With a scintillation gamma camera it is possible to do sequential scintiphotography. Based on scintigraphy with 99rnTc-pertechnetate of healthy salivary glands three phases can be distinguished. Phase 1. During the first seconds of this phase, a rapid diffuse spreading of the isotope over the lower half of the face is seen. Phase 2. During the uptake phase the salivary glands concentrate the radionucleid from the blood. The maximum concentration is usually 62

Salivary gland scintiphotography.

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