case_images: PMC6884986_01
case_images: A 76-year-old male who presented with enlarging right breast lump which proved to be an epidermoid cyst. (a) Cranial-caudal mammogram of the right breast demonstrates a circumscribed oval hyperdense mass within the central breast. (b) Mediolateral oblique mammogram of the right breast demonstrates a well-circumscribed oval hyperdense mass within the upper breast.
case_images: JCIS-9-50-g001.jpg
case_images: PMC6884986_01_JCIS-9-50-g001.jpg
case_images: F1
case_images: Mammography confirmed the presence of a well-circumscribed oval hyperdense mass in the upper inner quadrant of the right breast [Figure 1a and b].
case_images: A 76-year-old male who presented with an enlarging right breast lump which proved to be an epidermoid cyst. Gray scale ultrasound of the right breast demonstrates an oval circumscribed mass with heterogeneous echogenicity at the 12 o'clock position 4 cm from the nipple. The mass is primarily located within the subcutaneous tissue. Contact with the deepest dermal layer forms an obtuse angle.
case_images: JCIS-9-50-g002.jpg
case_images: PMC6884986_01_JCIS-9-50-g002.jpg
case_images: F2
case_images: Ultrasound imaging of the right breast at the 12 o'clock position 4 cm from the nipple demonstrated a 2.1 cm oval circumscribed mass with heterogeneous internal echogenicity [Figure 2].
case_images: A 76-year-old male who presented with an enlarging right breast lump which proved to be an epidermoid cyst. Color Doppler ultrasound of the right breast mass demonstrates internal vascularity (arrow).
case_images: JCIS-9-50-g003.jpg
case_images: PMC6884986_01_JCIS-9-50-g003.jpg
case_images: F3
case_images: Additional features of the mass included a small focus of suspected internal vascularity and posterior acoustic enhancement [Figure 3].
case_images: A 76-year-old male who presented with an enlarging right breast lump which proved to be an epidermoid cyst. Ultrasound- guided core biopsy of the right breast mass was performed with a 12-gauge needle.
case_images: JCIS-9-50-g004.jpg
case_images: PMC6884986_01_JCIS-9-50-g004.jpg
case_images: F4
case_images: The patient was scheduled for ultrasound-guided core biopsy which was performed 2 weeks later with a 12-gauge spring- loaded needle [Figure 4].
case_images: A 76-year-old male who presented with an enlarging right breast lump which proved to be an epidermoid cyst. Post-biopsy ultrasound of the right breast mass 2-3 weeks later demonstrates a ruptured epidermoid cyst with surrounding inflammation and abscess formation. Note pus-filled tract extending to the skin (arrow).
case_images: JCIS-9-50-g005.jpg
case_images: PMC6884986_01_JCIS-9-50-g005.jpg
case_images: F5
case_images: Repeat ultrasound was performed and again demonstrated the biopsied mass, now with an adjacent complex collection and a fluid-filled tract extending to the skin surface [Figure 5].