Palpable non painful mass
The pathologist could not find any malignant cells in the hemorrhagic fluid. The core biopsy however showed the lesion to be an infiltrating ductal carcinoma. Had a blind puncture been performed without ultrasound the conclusion could have been that the lesion was benign.
Most breast cancers in male patients are solid lesions. However malignant cystic lesions exist and core biopsy is the method of choice to confirm malignancy.
Conclusion Mainly cystic ductal carcinoma of the breast in a male.
References
Yang WT, Whitman GJ, Yuen EH, Tse GM, Stelling CB. Sonographic features of primary breast cancer in men.AJR Am J Roentgenol. 2001 Feb;176(2):413-6.
Tochika N, Takano A, Yoshimoto T, Tanaka J, Sugimoto T, Kobayashi M, Matsuura K, Araki K, Ogawa Y, Moriki T. Intracystic carcinoma of the male breast: report of a case.
Surg Today. 2001;31(9):806-9.