Hi Vipul Bansal, the FNAC if done from the breast tissue then I need to know a little of history about the duration ,size of lump and age of the patient. Low cellularity from breast tissue usually favours benign lesions if taken from the right site, but as there are presence of pleomorphic cells with irregular nuclei and nucleoli as well it goes in favour of a malignant lesion. You should get the FNAC repeated or get an ultrasoound guided fnac done to get a more conclusive picture. Other option is to go for a tru-cut biopsy
to rule out any malignancy. From this picture you can definitely not ignore the lump and must find a conclusive diagnosis and treatment. Take care.