Inflammatory breast cancer (IBC) is one of the most aggressive types of breast cancer. It can occur in women of any age (and, extremely rarely, in men, see male breast cancer). It is referred to as "inflammatory" due to its frequent presentation with symptoms resembling a skin inflammation, such as erysipelas. Inflammatory breast cancer presents with variable signs and symptoms, frequently without detectable lumps or tumors; it therefore is often not detected by mammography or ultrasound. Typical presentation is rapid breast swelling, sometimes associated with skin changes (peau d'orange), and nipple retraction. Other signs include redness, persistent itching, and unusually warm skin. IBC often initially resembles mastitis. Approximately 50% to 75% of cases have the typical presentation; an atypical presentation makes diagnosis more difficult. In some cases, a sign such as acute central venous thrombosis may be the sole presenting indication of the disease. IBC comprises a small proportion of breast cancer cases (1% to 6% in the USA). African-Americans are usually diagnosed with IBC at younger ages than Caucasian women, and they are also at higher risk for the disease. Recent advances in therapy have improved the prognosis considerably; at least one-third of women will survive with IBC for ten years or longer. Symptoms Signs and symptoms are quite variable, and may not be present at all in "occult" inflammatory breast cancer. Rapid onset of symptoms is typical; the breast often looks swollen and red, or "inflamed", sometimes seemingly changing overnight. IBC is frequently misdiagnosed as mastitis. Invasion of the local lymphatic ducts, the hallmark sign of IBC, impairs lymphatic drainage and causes edematous swelling of the breast. Because the skin of the breast is tethered by the suspensory ligament of Cooper, the accumulation of fluid within the lymphatic system of the skin may cause the breast skin to assume a dimpled appearance similar to an orange peel (peau d'orange). A palpable tumor is not always found as it would be in other forms of breast cancer. Symptoms may include: Sudden swelling of the breast Skin changes on breast Reddened area with a texture resembling the peel of an orange (peau d'orange) Nipple retraction (flattened look) or discharge Pain in the breast Itching of breast Swelling of lymph nodes under the arm or in the neck Unusual warmth of the affected breast Breast is harder or firmer Other symptoms may rarely include: Swelling of the arm Breast size may