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Arizono, N. & Nakao, S. Kinetics and staining properties of mast cells proliferating in rat small intestine tunica muscularis and subserosa following infection with Nippostrongylzis hrasi1icwsi.s. APMIS 96: 964-970, 1988.Mucosal mast-cell hyperplasia occurs in the rat small intestine mucosa after infection with Nippostrongylzrs hrusilicnsis. In the present study, the number of mast cells was found to increase in the muscularis and subserosa as well as in the mucosa of rat small intestines 2-3 weeks after infection with this nematode. Mast cells in the muscularis were stained blue by the alcian blue/safranin sequence and did not bind berberine sulfate. The staining was blocked when tissues were fixed in neutral formalin. The increase in mast cells was transient and gradually disappeared; the half-life was 40 days. After an intravenous administration of compound 48/80, mast cells in the muscularisdid not dischargegranules. The results indicate that these mast cells were of the mucosal type. The mast cell phenotype in the muscularis did not change even 12 weeks after infection. Mast cells in the subserosal tissue were first of the mucosal type as were those in muscularis. After 8-12 weeks, however, many subserosal mast cells became positive for berberine sulfate and safranin. These results show that mucosal-type mast cells do not undergo phenotypic changes during the period of observation when these cells appear in the muscularis but the phenotypic expression may change as the cells arise in subserosal tissue.

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Lymphangioma of the small intestine is so rare that only 28 cases have been reported in Japan. This paper describes a case of lymphagioma of the jejunum, together with a review of the literature. A 30-year-old woman was admitted to our hospital with the chief complaints of nausea and lumbago. Urinalysis, haematological and biochemical screening were normal. Ultrasonography and computed tomography filled with a clear yellow fluid was found in the jejunum 140cm distant from the Treitz's ligament. Partial resection of the jejunum was carrried out, and pathologically it was diagnosed as cavernous lymphangioma.