Dominic Stone
Psoas abscess is a rare medical condition characterised by a collection of pus in the psoas muscle of the spine, located in the lower lumbar region. It is a painful condition that can cause acute low back pain and is associated with high morbidity and mortality. The psoas muscle is surrounded by a rich venous plexus, which makes it susceptible to infections. Psoas abscesses can be categorised into primary and secondary types, depending on the presence or absence of underlying diseases. Primary psoas abscesses are commonly associated with intravenous drug use or immunocompromise, while secondary psoas abscesses are often caused by the spread of infection from nearby structures.
| Characteristics | Values |
|---|---|
| Definition | A rare medical condition that is defined as a painful collection of pus in the psoas muscle of the spine |
| Muscle Location | Lower lumbar region of the spine, extending through the pelvis to the femur |
| Muscle Anatomy | In 70% of people, the psoas muscle is a single structure, but 30% have the psoas minor that lies anterior to the major |
| Muscle Function | The chief flexor of the hip |
| Muscle Innervation | Lumbar plexus via branches of the L2–L4 nerves |
| Muscle Susceptibility to Infection | The psoas muscle is surrounded by a rich venous plexus, which makes it susceptible to infection from hematogenous spread |
| Types | Primary or Secondary |
| Primary Cause | Hematogenous (originating in or carried by the blood) spread of an infectious process from an occult (hidden) source in the body |
| Risk Factors for Primary Psoas Abscess | Diabetes mellitus, AIDS, kidney failure, immunosuppression, intravenous drug use, trauma to muscle |
| Secondary Cause | Spread of infection from gastrointestinal diseases such as appendicitis, Crohn's disease, diverticulitis, or perforated colon carcinoma |
| Secondary Cause | Spread of infection from genitourinary infections, such as a perinephric abscess, vaginal delivery, cesarean surgery, abortion, or an infected retroperitoneal hematoma |
| Symptoms | Acute low back pain, flank pain, fever, and an inguinal mass |
| Diagnosis | Physical exam, blood tests, ultrasonography, CT scan, MRI |
| Treatment | Administration of antibiotics, abscess drainage (percutaneously or with open surgery) |
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What You'll Learn
Psoas abscess is a rare medical condition
The condition is uncommon and often challenging to diagnose due to its nonspecific clinical presentation. It can be categorised into primary and secondary abscesses based on the presence or absence of underlying diseases and their causes. Primary psoas abscesses are presumed to be caused by hematogenous spread, originating in or carried by the blood, from an occult (hidden) source. Risk factors for primary abscesses include intravenous drug use, immunocompromise, diabetes, and renal failure. Secondary psoas abscesses, on the other hand, are a result of the direct spread of infection to the psoas muscle from adjacent structures and are more likely to occur in older patients. Gastrointestinal diseases, such as appendicitis, Crohn's disease, and diverticulitis, are the most common sources of secondary psoas abscesses.
The diagnosis of a psoas abscess requires a thorough physical examination, as signs and symptoms may be vague. A positive psoas sign, indicated by severe pain after certain movements, should raise suspicion. Imaging techniques, such as blood tests and ultrasonography, and CT scans, play a crucial role in confirming the presence of a psoas abscess. CT scans, in particular, are highly effective in detecting and confirming the condition.
The treatment for a psoas abscess typically involves the administration of antibiotics and drainage of the abscess. The choice of antibiotic depends on the specific pathogens involved. Abscess drainage can be performed percutaneously (through the skin) with CT assistance or through open surgery. The CT-assisted percutaneous approach is preferred due to its minimally invasive nature and lower morbidity and mortality risks.
While rare, some psoas abscesses may be associated with malignant metastatic diseases, such as cervical carcinoma or lung cancer. In such cases, a biopsy and histopathological evaluation can aid in diagnosis and treatment planning.
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It is a collection of pus in the psoas muscle
A psoas abscess is a rare medical condition characterised by a collection of pus in the psoas muscle of the spine, specifically in the lower lumbar region. The psoas muscle extends through the pelvis to the femur. The condition is often missed due to its nonspecific clinical presentation. However, it is associated with high morbidity and mortality.
The abscesses can be categorised into primary or secondary. A primary psoas abscess is caused by the hematogenous spread of an infectious process from an occult (hidden) source in the body. Individuals with diabetes mellitus, AIDS, kidney failure, immunosuppression, or intravenous drug use are at risk of developing a primary psoas abscess. A secondary psoas abscess, on the other hand, is caused by the spread of infection from adjacent structures, such as gastrointestinal diseases like appendicitis, Crohn's disease, diverticulitis, or a perforated colon carcinoma. Gastrointestinal diseases are the most common source of secondary psoas abscesses.
The diagnosis of a psoas abscess requires a vigilant physical examination as the clinical presentation is often vague. Signs to look out for include a palpable mass in the inguinal region or groin, a limp, and severe pain after certain movements. Blood tests and ultrasonography can be used in the diagnostic process, but a CT scan is the recommended choice as it can detect and confirm a psoas abscess in the majority of cases.
The treatment for a psoas abscess typically involves administering antibiotics and draining the abscess. The choice of antibiotic depends on the pathogens involved. Abscess drainage can be performed percutaneously (through the skin) with CT assistance or through open surgery. The CT-assisted percutaneous method is preferred as it is minimally invasive and can effectively treat most psoas abscesses.
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It can be categorised as primary or secondary
Psoas abscess (PA) is a rare disorder referring to a collection of pus in the psoas muscle compartment. It is an uncommon variant of pyomyositis, where a purulent infection affects the psoas muscle. The psoas muscle is located in the lower lumbar region of the spine and extends through the pelvis to the femur.
Psoas abscesses can be categorised as primary or secondary. A primary psoas abscess is caused by the hematogenous (originating in or carried by the blood) spread of an infectious process from an occult (hidden) source in the body. Individuals with diabetes mellitus, AIDS, kidney failure, immunosuppression, or intravenous drug use are at risk of developing a primary psoas abscess. It is also more common in children compared to adults. Staphylococcus aureus is the most common pathogen in primary psoas abscesses.
A secondary psoas abscess, on the other hand, is caused by the direct spread of infection to the psoas muscle from an adjacent structure. This type of abscess is more likely to occur in older patients. Gastrointestinal diseases such as appendicitis, Crohn's disease, diverticulitis, and perforated colon carcinoma are common sources of secondary psoas abscesses. Renal disease is the second most common source. Mycobacterium tuberculosis is another common pathogen associated with secondary psoas abscesses.
The diagnosis of a psoas abscess can be challenging due to its nonspecific clinical presentation. A physical exam, blood tests, and ultrasonography can be part of the diagnostic process. However, a CT scan is the recommended choice for abscess detection, as it can confirm a psoas abscess in 80 to 100% of cases. Treatment for a psoas abscess typically includes the administration of antibiotics and drainage of the abscess.
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Diagnosis and treatment options
Psoas abscess is a rare medical condition characterised by a collection of pus in the psoas muscle of the spine, located in the lower lumbar region. The muscle extends through the pelvis to the femur. Due to its vague clinical presentation, diagnosing psoas abscess can be challenging. The classic triad of fever, back pain, and psoas spasm is present in only 30% of patients. Other common symptoms include malaise, weight loss, nausea, anorexia, and pain that radiates to the flank, groin, or anterior thigh. Back pain is the most frequently encountered symptom, with a mean duration of 10.6 days before presentation.
On examination, the presence of a limp, palpable mass in the inguinal region, severe pain upon passive hyperextension of the hip, or active flexion of the psoas against the examiner's hand can be indicative of a psoas abscess. A thorough medical history and imaging studies, such as CT scans, ultrasounds, and MRIs, are useful for diagnosis. Laboratory tests such as a complete blood count (CBC), erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), blood cultures, and urinalysis (UA) may also aid in diagnosis.
Treatment options for psoas abscess include both surgical and minimally invasive approaches. Surgical drainage through a lower abdominal muscle-splitting, extraperitoneal incision was traditionally the treatment of choice. However, in recent years, minimally invasive percutaneous computed tomography (CT)-guided drainage has become the preferred approach, especially for immunocompromised patients. This method eliminates the need for general anaesthesia and is associated with shorter hospital stays and reduced morbidity and mortality. Antibiotic therapy, such as ciprofloxacin and clindamycin, is also administered based on the culture results.
The choice between surgical and minimally invasive treatment depends on the patient's condition and the presence of any underlying pathologies. In some cases, patients may require hospitalisation and in-patient care, while others can be managed as outpatients. Proper and early diagnosis is crucial, as delayed treatment can lead to increased mortality, with death occurring in almost 100% of untreated cases, often due to sepsis.
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Risk factors and causes
Psoas abscess (PA) is an uncommon disease that has been increasingly reported in recent years. It is a rare disorder referring to a collection of pus in the psoas muscle compartment. The psoas muscle is supplied by venous blood from the lumbar spine and has lymphatics from nearby intra-abdominal organs overlying it.
Psoas abscesses are most commonly the result of a mesenteric abscess extending through the mesentery into the retroperitoneal space overlying the psoas muscle. They are initiated, in most cases, from the direct extension of a nearby infection, as seen in spinal osteomyelitis caused by Mycobacterium tuberculosis (Pott's disease) or S aureus (intravenous drug abusers). Intraperitoneal sources can also extend to the muscle from ruptured appendicitis, diverticulitis, or Crohn's disease. Less commonly, psoas abscesses may arise from hematogenous seeding of the muscle, which is seen principally in children from Staphylococcus aureus.
Primary psoas abscesses are caused by the hematogenous or lymphatic spread of a pathogen from a distant source. Risk factors include underlying immunosuppression (e.g. diabetes mellitus, HIV, malignancy), intravenous drug use, and tuberculosis. Injuries to the psoas muscle, such as trauma or ischemia, also raise the risk of infection.
Secondary psoas abscesses develop as a result of the spread of infection from contiguous structures, such as concurrent vertebral infections. Other routes may be from an intra-abdominal source, most commonly gastrointestinal, including Crohn's disease, cancer, appendicitis, or diverticulitis. Less commonly, psoas abscesses may develop in association with genitourinary infections, such as a perinephric abscess, vaginal delivery, cesarean surgery, abortion, or an infected retroperitoneal hematoma.
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Frequently asked questions
A psoas abscess is a rare medical condition in which pus collects in the psoas muscle of the spine, located in the lower lumbar region.
Symptoms include flank pain, fever, and an inguinal mass. The abscess may drain into the upper medial thigh and present as a swelling in the region.
A physical examination is important for diagnosis. Blood tests and ultrasonography can also be used, but the recommended choice for detection is a CT scan, which has an accuracy rate of 80 to 100%.
Treatment includes the administration of antibiotics and drainage of the abscess. The choice of antibiotic depends on the pathogens involved. Drainage can be performed percutaneously with CT assistance or through open surgery.
