Mondor's disease is a rare, benign condition characterised by thrombophlebitis 
affecting subcutaneous veins of the chest and/or abdomen without an accompanying 
inflammatory response. The disease has a multifactorial etiology and its course 
is benign. It is usually self-limiting or it is eliminated by local treatment. 
Mondor's disease in the thoracoepigastric region may be a rare complication of 
mammotome biopsy. The case presentation describes a 32-year-old patient with 
Mondor's disease in the thoracoepigastric region after an ultrasound-guided 
mammotome biopsy of a breast. In the histopathological examination the lesion 
was diagnosed as fibroadenoma. Regardless of the disease's etiology, it is 
recommended to carry out diagnostic examinations to exclude co-occurring breast 
cancer.