histochemical and electron-microscopic studies of skin biopsy specimens from 65 patients with mastocytosis have enabled the authors to classify the various mastocytoses ( on the basis of infiltrate topography and structural features of mast cells ) into macular , pustular , and nodular varieties of cutaneous mastocytosis ( urticaria pigmentosa ) and mastocytoma .
C1136033
cutaneous
C0042111
urticaria pigmentosa