Differential Diagnosis for a Lump on the Left Lower Chest Wall
Single Most Likely Diagnosis
- Lipoma: A benign tumor composed of fat tissue, which is often mobile, nontender, and can be found on the chest wall. The small size (<1 cm) and round shape are consistent with a lipoma.
Other Likely Diagnoses
- Cyst: A fluid-filled sac that can be found on the chest wall, which may be mobile and nontender. The size and shape could be consistent with a cyst.
- Sebaceous cyst: A benign cyst that forms from blocked oil glands in the skin, which can be found on the chest wall and may be mobile and nontender.
- Neurofibroma: A benign tumor of the nerve tissue, which can be found on the chest wall and may be mobile and nontender.
Do Not Miss Diagnoses
- Metastatic tumor: Although less likely, a metastatic tumor from a distant primary site (e.g., breast, lung, or gastrointestinal tract) could present as a lump on the chest wall. It is essential to consider this possibility, especially if the patient has a history of cancer.
- Lymphoma: A malignant tumor of the immune system, which can present as a lump on the chest wall. Although less common, it is crucial to consider this diagnosis to avoid delayed treatment.
Rare Diagnoses
- Dermatofibroma: A rare, benign tumor of the skin, which can be found on the chest wall and may be mobile and nontender.
- Hamartoma: A rare, benign tumor-like growth that can be found on the chest wall, which may be mobile and nontender.
- Chondroma: A rare, benign tumor of the cartilage, which can be found on the chest wall and may be mobile and nontender.