. Tumours, innocent and malignant; their clinical characters and appropriate treatment. The breast was amputated, and on microscopic examinationthe tumour proved to be a perithelioma (Figs. 199 and 200). Peritheliomas.—This variety includes the rare tumourstyled angeio-sarcoma (Ziegler). On microscopic examinationthe tissues of such tumours resemble superficially the lobesof the hver; this peculiarity depends on an overgrowth ofcells in the perivascular sheaths of the small vessels (Fig. 200). Psammomas (dura-endotheliomas).—This variety growsin connexion with the dura and the pia mater of the
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. The breast was amputated, and on microscopic examinationthe tumour proved to be a perithelioma (Figs. 199 and 200). Peritheliomas.—This variety includes the rare tumourstyled angeio-sarcoma (Ziegler). On microscopic examinationthe tissues of such tumours resemble superficially the lobesof the hver; this peculiarity depends on an overgrowth ofcells in the perivascular sheaths of the small vessels (Fig. 200). Psammomas (dura-endotheliomas).—This variety growsin connexion with the dura and the pia mater of the brainand spinal cord. These tumours are called psammomas, orsand tumours, on account of the presence in varying quantityof earthy matter like that in the pineal body. Cholesterinis also present, and often in such quantity that the tumour PSAMM0MA8 411 assumes a pearly lustre when exposed to light. A veryremarkable example of this is preserved in the museum of theRoyal College of Surgeons, London. The tumour, which fillsthe fourth ventricle, has an average diameter of 10 cm.; it. Fig. 201.—Psammoma lying in relation with the flocculus. The patient, a managed 36 years, died from an attempt made to remove the tumoui. The chiefsymptoms were deafness, pain, vomiting, giddiness, and nystagmus. looks like a solid pearl disparting the two halves of the cere-bellum, and projects between the inferior vermiform processand the medulla. The catalogue contains an interestingclinical history furnished by Miss B. Knowles. A psammoma rarely exceeds in size a shelled walnut, andwhen growing in connexion with the choroid plexuses of the 412 ENDOTHELIAL TUMOURS cerebral ventricles these tumours may be bilateral; when largethey form deep bays in the adjacent brain-tissue, and whengrowing in the immediate vicinity of important nerves causesevere and disastrous consequences (Fig. 201). The structure of a typical psammoma (Fig. 202) shows itsintimate relation to blood-vessel; each concentric bo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
