Capnocytophaga sputigena primary iliopsoas abscess

Area of Science:

• Infectious Diseases
• Oncology
• Bacteriology

Background:

• Iliopsoas abscesses typically arise from contiguous infections, with primary forms being rare in adults.
• Staphylococcus aureus is the primary pathogen in pediatric cases.
• Head and neck tumors, especially those treated with radiotherapy, can predispose patients to unusual infections.

Observation:

• A 60-year-old woman presented with a primary iliopsoas abscess.
• The infection was linked to Capnocytophaga sputigena, a fastidious Gram-negative bacillus.
• The source of infection was identified as a palatal fistula and chronic sinusitis, stemming from prior nasopharyngeal carcinoma treatment.

Findings:

• Demonstrates a rare case of primary iliopsoas abscess in an adult.
• Identifies Capnocytophaga sputigena as the causative agent, spread hematogenously.
• Establishes a link between prior radiotherapy for head and neck cancer and the development of pyomyositis from unusual bacteria.

Implications:

• Highlights the importance of considering rare pathogens like Capnocytophaga sputigena in immunocompromised patients.
• Suggests pyomyositis should be considered in the differential diagnosis for patients with head and neck malignancies and prior radiotherapy.
• Emphasizes the need for thorough investigation of infectious foci in complex cases of iliopsoas abscess.