Has anyone considered unusual ductal or rather sinus structure when working with mothers who have difficulty lactating? I feel like our pumps are not giving us enough variety in tunnel shape and size availability, and I think that some women with difficulty have not only a baby who has difficulty getting the system working, but then a pump that cannot retrieve milk, and the towell gets thrown in and then we assume it is insufficient glandular tissue. Does anyone know have more extensive information on typical and nontypical lactiferous sinus variations? Fritzi Drosten, RN, IBCLC Piedmont, CA