Differential Diagnosis for Left Breast Mass
Single Most Likely Diagnosis
- Fibroadenoma: A common benign breast tumor, especially in young women, characterized by a hard, moveable, and painless mass, although some patients may experience tenderness. The size and mobility of the mass are consistent with this diagnosis.
Other Likely Diagnoses
- Cyst: A fluid-filled sac that can feel like a hard, moveable lump, especially if it is new or has recently changed in size. Pain can be associated with cysts, especially if they are large or become infected.
- Breast abscess or infected cyst: Although there's no visible bruising, redness, or heat, an abscess could present with pain and a palpable mass. The absence of systemic symptoms like fever does not rule out a localized infection.
- Lipoma: A benign tumor composed of fat tissue, which can feel like a soft, moveable mass but can sometimes be firm. It's less common in the breast compared to other parts of the body but should be considered.
Do Not Miss Diagnoses
- Breast Cancer: Although less likely given the patient's age and the description of the mass, breast cancer must always be considered, especially if there's a family history or other risk factors. A hard, moveable mass can sometimes be an early sign of cancer.
- Phyllodes Tumor: A rare tumor of the breast that can be benign, borderline, or malignant. These tumors can grow quickly and may feel like a hard, moveable mass. They are important to diagnose early due to their potential for malignancy.
Rare Diagnoses
- Hamartoma: A benign breast tumor composed of a mixture of glandular, fibrous, and fatty tissues. It can feel like a firm, moveable mass but is relatively rare.
- Pseudoangiomatous Stromal Hyperplasia (PASH): A rare benign condition of the breast that can mimic a tumor. It's more common in young women and can present as a palpable mass.
- Adenosis or fibrosis: Conditions that can cause a firm, sometimes painful mass due to the overgrowth of tissue within the breast. They are benign but can be concerning due to their palpability and potential for discomfort.