Mondor's disease (MD), or superficial thrombophlebitis of the anterolateral thoracoabdominal wall, is a rare disease that presents with a palpable cord-like induration beneath the skin. It is a benign, self-limiting condition with probably underestimated significance due to the fact it may be a rare manifestation of an underlying breast carcinoma. It can also resemble breast malignancy and, if physician is not familiar with clinical features of MD, it may lead to unnecessary biopsy. The diagnosis is straightforward in most cases and it may be based on a thorough history and physical examination and it can be ultrasonographically confirmed. Raising awareness of this condition may facilitate recognition and diagnosing MD and eventually limit unnecessary diagnostic procedures.