Erythema and induration with fluctuance and spontaneous drainage, with possible osteomyelitis of ribs, sternum, or clavicle, is most consistent with which condition?

Erythema and induration with fluctuance and spontaneous drainage, with possible osteomyelitis of ribs, sternum, or clavicle, is most consistent with which condition?

• A. Infection of costal cartilage and xiphoid
• B. Primary chest wall tumor
• C. Pneumothorax
• D. Rib fracture

Answer: (A)

Chest wall infections that involve the costal cartilage often present with redness, firm swelling, and warmth over the chest, and can develop a fluctuant, pus-filled area that may drain spontaneously. This combination—erythema and induration plus a fluctuant mass that drains—is characteristic of an abscess in the soft tissues of the chest wall, and the infection can extend to adjacent bone, leading to possible osteomyelitis of the ribs, sternum, or clavicle. Infections of the costal cartilage and xiphoid are therefore the best fit for this presentation. A primary chest wall tumor would typically present as a more solid, nonfluctuant mass without the acute inflammatory signs or spontaneous drainage. Pneumothorax presents with chest pain and respiratory symptoms rather than a draining skin infection. A rib fracture causes localized pain and swelling after trauma, not an infectious draining lesion.

Chest wall infections that involve the costal cartilage often present with redness, firm swelling, and warmth over the chest, and can develop a fluctuant, pus-filled area that may drain spontaneously. This combination—erythema and induration plus a fluctuant mass that drains—is characteristic of an abscess in the soft tissues of the chest wall, and the infection can extend to adjacent bone, leading to possible osteomyelitis of the ribs, sternum, or clavicle. Infections of the costal cartilage and xiphoid are therefore the best fit for this presentation.

A primary chest wall tumor would typically present as a more solid, nonfluctuant mass without the acute inflammatory signs or spontaneous drainage. Pneumothorax presents with chest pain and respiratory symptoms rather than a draining skin infection. A rib fracture causes localized pain and swelling after trauma, not an infectious draining lesion.