What is the diagnosis for a lump on the left lower chest wall, described as a round, less than 1 centimeter (cm), mobile, and non-tender mass?

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Last updated: May 15, 2025 • View editorial policy

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.

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.