. Diseases of the ear : a text-book for practitioners and students of medicine. rnoustissue as well. Atheroma (Figs. 74 and 75).—A tumor of this characterresults from blocking up of the sebaceous follicles with whichthe integument covering the external ear is supplied. Thesecretion which the glands produce is imprisoned by the ste-nosis of the orifices of the ducts, dilates the gland cavity, andgives rise to a tumefaction of varying size. Where the glandis active, the rapid formation of its product may produce somuch pressure as to cause spontaneous rupture. On theother hand, after attaining a
. Diseases of the ear : a text-book for practitioners and students of medicine. rnoustissue as well. Atheroma (Figs. 74 and 75).—A tumor of this characterresults from blocking up of the sebaceous follicles with whichthe integument covering the external ear is supplied. Thesecretion which the glands produce is imprisoned by the ste-nosis of the orifices of the ducts, dilates the gland cavity, andgives rise to a tumefaction of varying size. Where the glandis active, the rapid formation of its product may produce somuch pressure as to cause spontaneous rupture. On theother hand, after attaining a certain size the obstruction inthe duct may be overcome, allowing a sufficient amount ofthe contents to escape to relieve the tension without restor-ing the normal patency of the tube. This process may berepeated indefinitely, and the patient presents with the his-tory of a recurrent discharge from the growth at varying * Archiv fiir Ohrenheilkunde, vol. xxxii, p. 161. f Transactions of the American Otological Society, vol. iii, part iii. 208 BENIGN TUMORS OF THE intervals. Again, the pressure may be so severe as to excitean inflammation within the sac, with the consequent produc-tion of a purulent discharge. The lobule is a favorite seat for thesegrowths, or the junction of the lobule withthe skin of the neck. INIarian * has re-ported a case in which the neoplasm filledthe concha. Where spontaneous evacua-tion has not taken place dissection usuallyreveals a distinct sac. Where the con-tents of the cyst have undergone infectionand rupture has occurred as the result ofan inflammatory process, the lining mem-brane is usually so amalgamated with thesurrounding tissuesas to render its rec-ognition as a dis-tinct structure dif-ficult. Under the mi-croscope the con- FlG. 74.—Atheroma. \ tents of such a tu-mor is found to be made up of seba-ceous material, degenerated epithelialcells, with an occasional admixture ofcholesterin crystals. Treatment.—This condition is be
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