Diagnosing Foot Symptoms: Focusing on Cellulitis

Patient Presentation Summary

A 50-year-old female reports pain, swelling, and redness in her left foot after a minor injury sustained 3 days ago. Examination reveals poorly localised swelling, local tenderness, and erythema. Importantly, crepitus is absent, and distal pulses are palpable.

Differential Diagnosis Analysis

The clinical findings are evaluated against the potential diagnoses:

• Cellulitis: Characterized by infection of the skin and subcutaneous tissue, presenting with erythema, warmth, swelling, and pain. The swelling is often poorly localised. The history of trivial trauma provides a potential entry point for infection. The absence of crepitus and presence of palpable pulses are consistent with cellulitis.
• Compartment Syndrome: Typically results from increased pressure within a muscle compartment, often due to significant trauma. Key signs include severe pain, paresthesia, pallor, and potentially pulselessness. The palpable pulses and trivial trauma make this diagnosis unlikely.
• Abscess: This involves a localised collection of pus, usually presenting as a fluctuant, tender mass. The swelling in this case is described as "poorly localised," making a distinct abscess less likely.
• Fasciitis: Inflammation of the fascia. Necrotizing fasciitis is a severe form, but often presents with rapidly progressing symptoms, skin necrosis, or crepitus, none of which are described here.

Conclusion on Likely Diagnosis

Given the presence of erythema, swelling, tenderness, and pain, combined with poorly localised swelling, absence of crepitus, and palpable distal pulsations following minor trauma, Cellulitis is the most fitting clinical diagnosis.