6.6. Skin and Soft Tissue Infection - Pyomyositis

Question 1

How is Pyomyositis described?

Answer 1

Purulent infection deep within Striated Muscle

Question 2

How does Pyomyositis often manifest itself?

Answer 2

As an Abscess

Question 3

What is the infection related to?

Answer 3

Infection is often secondary to seeding into damaged muscle

Question 4

How often are multiple sites involved?

Answer 4

15% of the time

Question 5

What are the common sites of Pyomyositis?

Answer 5

1. Thigh
2. Calf
3. Arms
4. Gluteal Region
5. Chest Wall
6. Psoas Muscle

Question 6

What are the predisposing factors of Pyomyositis?

Answer 6

1. Diabetes Mellitus
2. HIV/Immunocompromised
3. Intravenous Drug Abuse
4. Rheumatological Disease
5. Malignancy
6. Liver Cirrhosis

Question 7

How does Pyomyositis present?

Answer 7

1. Pain
2. Woody induration of affected muscle
3. Fever
   Note- if untreated can lead to Septic Shock and Death

Question 8

What is the most common causative organism of Pyomyositis?

Answer 8

Staphylococcus Aureus

Question 9

Other than Staphylococcus Aureus, what organisms can cause Pyomyositis?

Answer 9

1. Other Gram Positives
2. Gram Negatives
3. Myscobacterium Tuberculosis
4. Fungal Infections

Question 10

What investigation is done for Pyomyositis?

Answer 10

1. CT
2. MRI

Question 11

What is the treatment of Pyomyositis?

Answer 11

1. Drainage
2. Antibiotic Cover (depending on Gram Stain and Culture Results)