Idiopathic granulomatous mastitis mimicking inflammatory breast carcinoma: What are the odds?

A 27-year-old Hispanic woman presented with a breast lump, fever, joint pain, and a rash over her anterior shins. Since 1 one month of presentation she had noticed a breast lump which was slowly increasing in size. She was a mother of 2 children and had last breastfed 3 years ago. She denied any trauma to the breast or any nipple discharge. In the week prior to admission, the patient also began to experience fever and joint pain, most severely in her left knee. During this time, she also developed multiple tender lesions over her lower extremities. On physical examination, patient was noted to have a 7 5 cm indurated mass over the right upper quadrant of her right breast, with overlying fluid and ecchymosis, no nipple discharge or retraction and no axillary lymphadenopathy. The patient had multiple tender erythematous nodules measuring 1–2 cm in diameter over her anterior shins in addition to one larger lesion measuring 5 cm on her right lateral thigh. The patient had mild effusion of the left knee with tenderness to palpation of the popliteal fossa and significant pain with both passive and active range of motion of her left knee.