- Published on
Infectious Diseases and Microbiology: Hepatosplenomegaly and Fever
Basics
Description
A midclavicular liver span of at least 12.5 cm supports hepatomegaly. Splenomegaly is defined as a spleen exceeding 250 g or one that is palpable, and on ultrasound is suggested by a cephalocaudal length of 13 cm or more
.
Approach to the Patient
Evaluating Hepatomegaly
Palpate to identify the lower liver edge at the right midclavicular line, then use gentle percussion to define the upper border so liver span can be measured; a span ≥12.5 cm supports hepatomegaly. Because hyperinflated lungs can push the liver downward, the upper border must be assessed to avoid overcalling enlargement.
Evaluating Splenomegaly
Bedside assessment should include both palpation and percussion. Palpation is best done bimanually with the patient supine and in the right lateral position. Percussion methods by Nixon and Castell provide the best diagnostic performance. In Nixon’s method, the patient lies on the right side and percussion begins in the posterior axillary line at the level where lung resonance ends, moving obliquely toward the left anterior costal margin; a dullness span over 8 cm suggests splenomegaly and has moderate sensitivity with high specificity. In Castell’s method, the patient is supine and percussion in the lowest intercostal space at the left anterior axillary line should remain resonant during inspiration if the spleen is normal; this approach has moderate sensitivity and specificity. If missing splenomegaly would change management, confirm with ultrasound or scintigraphy.
Evaluating Fever with Liver and/or Spleen Enlargement
Obtain a comprehensive history emphasizing travel and immigration, occupation, sexual history, intravenous drug use, animal exposure, and family history of malignancy, connective tissue disease, or inherited conditions. Look for associated findings including jaundice, fever duration and pattern, lymphadenopathy, rashes or bite exposures, liver edge texture and tenderness, an enlarged gallbladder or other abdominal mass, and spleen size and consistency. Initial testing commonly includes broad laboratory evaluation, heterophile antibody testing, hepatitis studies, imaging, and in selected cases bone marrow evaluation, endoscopy, and/or liver biopsy.
Epidemiology
In young adults, palpability of the liver and spleen can occur even without disease. In a large sample of healthy military personnel, the liver was not palpable or only at the costal margin in over half, and descended only 1–2 cm below the margin in many others. Studies of healthy college entrants have found a small proportion with unexplained palpable spleens, and palpable spleens have been reported in a notable minority of otherwise normal postpartum women.
Etiology
Hepatomegaly with Fever
Infectious causes include pyogenic or amoebic abscess, ascending cholangitis, chronic granulomatous disease, chronic Q fever, ehrlichiosis, histoplasmosis, HIV, infectious hepatitis, infectious mononucleosis, leptospirosis, syphilis, tuberculosis, and parasitic infections. Malignant causes include diffuse primary hepatic cancer, diffuse metastases, myeloproliferative disorders, lymphoma, and angiosarcoma. Inflammatory causes include sarcoidosis, autoimmune hepatitis, familial Mediterranean fever, and Still’s disease.
Splenomegaly with Fever
Infectious causes include viral infections such as hepatitis, infectious mononucleosis, and HIV; bacterial infections such as endocarditis, pyogenic abscess, salmonellosis, leptospirosis, brucellosis, Bartonella; fungal infections such as histoplasmosis; mycobacterial infections including miliary tuberculosis and nontuberculous mycobacteria; and parasitic infections including malaria, toxoplasmosis, amoebic liver abscess, schistosomiasis with Katayama fever, visceral leishmaniasis, babesiosis, and ehrlichiosis. Inflammatory causes include rheumatoid arthritis, sarcoidosis, systemic lupus erythematosus, and hemophagocytic lymphohistiocytosis. Malignant causes include lymphoma, acute and chronic leukemias, and myelodysplastic or myeloproliferative syndromes. Numerous parasites can enlarge liver and spleen depending on exposure context, including malaria, schistosomiasis, hydatid disease, leishmaniasis, toxocariasis, toxoplasmosis, liver flukes such as Fasciola hepatica, and echinococcal cysts, which can enlarge organs but are rarely febrile. Fever occurs in roughly half of toxoplasmosis and toxocariasis cases.
Diagnosis
History and Clinical Manifestations
In young adults, the combination of fatigue, sore throat, fever, lymphadenopathy, and hepatosplenomegaly is most often infectious mononucleosis. Fever with abdominal pain that may localize to the right upper quadrant, vomiting or anorexia, hepatomegaly, leukocytosis with elevated sedimentation rate, and otherwise unexplained anemia should raise concern for liver abscess. Pyogenic liver abscess most often arises from biliary disease and is commonly due to enteric organisms including Escherichia coli, Klebsiella, enterococci, anginosus group streptococci, and anaerobes, and is most often seen in adults in their fifth and sixth decades. Pyogenic liver abscess with metastatic infection such as endophthalmitis, meningitis, or other focal abscesses suggests Klebsiella pneumoniae, particularly in patients with diabetes and those from East Asia. Amoebic liver abscess is now most often seen in travelers and migrants; men have markedly higher risk of invasive Entamoeba histolytica disease including liver abscess, gastrointestinal symptoms such as nausea, vomiting, or diarrhea occur in a minority, and presentation may occur years after exposure. In HIV with advanced immunosuppression, fever with lymphadenopathy and splenomegaly is often mycobacterial, but lymphoma must be ruled out. Leptospirosis should be considered with compatible exposures and fever with rigors, headache, and myalgias, with severe disease involving pulmonary, hepatic, and renal dysfunction, aseptic meningitis, and bleeding tendencies. In tropical settings, splenomegaly may reflect hyper-reactive malarial splenomegaly, characterized by fever, anemia, weight loss, abdominal discomfort, lassitude, abnormal liver tests, elevated IgM, and hepatic sinusoidal lymphocytosis.
Physical Examination
Beyond confirming fever and organ enlargement, search for diagnostic clues such as lymphadenopathy suggesting lymphoma, infectious mononucleosis, brucellosis, schistosomiasis, HIV, or mycobacterial infection; rashes suggesting schistosomiasis, rickettsial disease, leishmaniasis, mononucleosis, Still’s disease, or syphilis; pharyngeal findings supporting mononucleosis; murmurs or embolic phenomena supporting endocarditis, Bartonella, or brucellosis; jaundice supporting viral hepatitis, cholangitis, or leptospirosis; conjunctival suffusion supporting leptospirosis; and joint findings supporting rheumatoid arthritis, lupus, or Still’s disease.
Diagnostic Tests and Interpretation
Laboratory Studies
Leukocytosis with a left shift supports bacterial infection. Marked lymphocytosis with atypical lymphocytes on smear supports infectious mononucleosis and can be confirmed early with heterophile antibody testing or with EBV viral capsid antigen IgM. Eosinophilia can accompany certain parasitic causes of hepatosplenomegaly but is not typical of amoebic infection. Three sets of blood cultures off antibiotics help exclude most endocarditis, while Bartonella, Brucella, and Q fever are better assessed by serology. Based on exposure history, obtain HIV, syphilis, and viral hepatitis testing, and consider serologies for rickettsial disease, Entamoeba, toxoplasma, schistosomiasis, Q fever, Fasciola, leptospirosis, and ehrlichiosis, along with blood films for malaria and babesiosis. Include biochemistry, autoimmune markers, and ferritin when inflammatory disease is considered. If imaging identifies an abscess, image-guided aspiration can establish diagnosis. Excisional lymph node biopsy or liver biopsy offers the highest yield for lymphoma. Bone marrow biopsy or splenic aspirate can diagnose leishmaniasis, with PCR or serology as alternatives.
Imaging
Ultrasound can confirm enlargement and identify causes such as abscess, hepatocellular carcinoma, or biliary pathology. Contrast-enhanced CT is helpful when ultrasound is nondiagnostic and suspicion remains for focal lesions or lymphoma. MRI is rarely needed but may help distinguish abscess from malignancy.
Treatment
Medications
Therapy is directed by the underlying diagnosis. Confirmed liver abscess requires antibiotics targeting likely organisms; pyogenic abscess is generally managed with percutaneous drainage plus antibiotics, with surgery reserved for failed drainage or complex multiloculated disease. Praziquantel is effective for Schistosoma mansoni in advanced hepatosplenic disease and is preferred when Schistosoma haematobium coinfection is present. Fascioliasis is typically treated with triclabendazole 10 mg/kg for one to two days; bithionol is an alternative, and the role of praziquantel is uncertain.
Ongoing Care and Follow-Up
Advise patients with splenomegaly to avoid contact sports and monitor for spontaneous rupture, which almost always presents with severe upper abdominal pain that often starts in the left upper quadrant, spreads more diffusely, and can radiate to the left shoulder.
Complications
In the United States, spontaneous splenic rupture is most commonly associated with infectious mononucleosis. Although rare, occurring in a small fraction of mononucleosis cases, it is the leading cause of death related to infectious mononucleosis.
Basics
Description
A midclavicular liver span of at least 12.5 cm supports hepatomegaly. Splenomegaly is defined as a spleen exceeding 250 g or one that is palpable, and on ultrasound is suggested by a cephalocaudal length of 13 cm or more
.
Approach to the Patient
Evaluating Hepatomegaly
Palpate to identify the lower liver edge at the right midclavicular line, then use gentle percussion to define the upper border so liver span can be measured; a span ≥12.5 cm supports hepatomegaly. Because hyperinflated lungs can push the liver downward, the upper border must be assessed to avoid overcalling enlargement.
Evaluating Splenomegaly
Bedside assessment should include both palpation and percussion. Palpation is best done bimanually with the patient supine and in the right lateral position. Percussion methods by Nixon and Castell provide the best diagnostic performance. In Nixon’s method, the patient lies on the right side and percussion begins in the posterior axillary line at the level where lung resonance ends, moving obliquely toward the left anterior costal margin; a dullness span over 8 cm suggests splenomegaly and has moderate sensitivity with high specificity. In Castell’s method, the patient is supine and percussion in the lowest intercostal space at the left anterior axillary line should remain resonant during inspiration if the spleen is normal; this approach has moderate sensitivity and specificity. If missing splenomegaly would change management, confirm with ultrasound or scintigraphy.
Evaluating Fever with Liver and/or Spleen Enlargement
Obtain a comprehensive history emphasizing travel and immigration, occupation, sexual history, intravenous drug use, animal exposure, and family history of malignancy, connective tissue disease, or inherited conditions. Look for associated findings including jaundice, fever duration and pattern, lymphadenopathy, rashes or bite exposures, liver edge texture and tenderness, an enlarged gallbladder or other abdominal mass, and spleen size and consistency. Initial testing commonly includes broad laboratory evaluation, heterophile antibody testing, hepatitis studies, imaging, and in selected cases bone marrow evaluation, endoscopy, and/or liver biopsy.
Epidemiology
In young adults, palpability of the liver and spleen can occur even without disease. In a large sample of healthy military personnel, the liver was not palpable or only at the costal margin in over half, and descended only 1–2 cm below the margin in many others. Studies of healthy college entrants have found a small proportion with unexplained palpable spleens, and palpable spleens have been reported in a notable minority of otherwise normal postpartum women.
Etiology
Hepatomegaly with Fever
Infectious causes include pyogenic or amoebic abscess, ascending cholangitis, chronic granulomatous disease, chronic Q fever, ehrlichiosis, histoplasmosis, HIV, infectious hepatitis, infectious mononucleosis, leptospirosis, syphilis, tuberculosis, and parasitic infections. Malignant causes include diffuse primary hepatic cancer, diffuse metastases, myeloproliferative disorders, lymphoma, and angiosarcoma. Inflammatory causes include sarcoidosis, autoimmune hepatitis, familial Mediterranean fever, and Still’s disease.
Splenomegaly with Fever
Infectious causes include viral infections such as hepatitis, infectious mononucleosis, and HIV; bacterial infections such as endocarditis, pyogenic abscess, salmonellosis, leptospirosis, brucellosis, Bartonella; fungal infections such as histoplasmosis; mycobacterial infections including miliary tuberculosis and nontuberculous mycobacteria; and parasitic infections including malaria, toxoplasmosis, amoebic liver abscess, schistosomiasis with Katayama fever, visceral leishmaniasis, babesiosis, and ehrlichiosis. Inflammatory causes include rheumatoid arthritis, sarcoidosis, systemic lupus erythematosus, and hemophagocytic lymphohistiocytosis. Malignant causes include lymphoma, acute and chronic leukemias, and myelodysplastic or myeloproliferative syndromes. Numerous parasites can enlarge liver and spleen depending on exposure context, including malaria, schistosomiasis, hydatid disease, leishmaniasis, toxocariasis, toxoplasmosis, liver flukes such as Fasciola hepatica, and echinococcal cysts, which can enlarge organs but are rarely febrile. Fever occurs in roughly half of toxoplasmosis and toxocariasis cases.
Diagnosis
History and Clinical Manifestations
In young adults, the combination of fatigue, sore throat, fever, lymphadenopathy, and hepatosplenomegaly is most often infectious mononucleosis. Fever with abdominal pain that may localize to the right upper quadrant, vomiting or anorexia, hepatomegaly, leukocytosis with elevated sedimentation rate, and otherwise unexplained anemia should raise concern for liver abscess. Pyogenic liver abscess most often arises from biliary disease and is commonly due to enteric organisms including Escherichia coli, Klebsiella, enterococci, anginosus group streptococci, and anaerobes, and is most often seen in adults in their fifth and sixth decades. Pyogenic liver abscess with metastatic infection such as endophthalmitis, meningitis, or other focal abscesses suggests Klebsiella pneumoniae, particularly in patients with diabetes and those from East Asia. Amoebic liver abscess is now most often seen in travelers and migrants; men have markedly higher risk of invasive Entamoeba histolytica disease including liver abscess, gastrointestinal symptoms such as nausea, vomiting, or diarrhea occur in a minority, and presentation may occur years after exposure. In HIV with advanced immunosuppression, fever with lymphadenopathy and splenomegaly is often mycobacterial, but lymphoma must be ruled out. Leptospirosis should be considered with compatible exposures and fever with rigors, headache, and myalgias, with severe disease involving pulmonary, hepatic, and renal dysfunction, aseptic meningitis, and bleeding tendencies. In tropical settings, splenomegaly may reflect hyper-reactive malarial splenomegaly, characterized by fever, anemia, weight loss, abdominal discomfort, lassitude, abnormal liver tests, elevated IgM, and hepatic sinusoidal lymphocytosis.
Physical Examination
Beyond confirming fever and organ enlargement, search for diagnostic clues such as lymphadenopathy suggesting lymphoma, infectious mononucleosis, brucellosis, schistosomiasis, HIV, or mycobacterial infection; rashes suggesting schistosomiasis, rickettsial disease, leishmaniasis, mononucleosis, Still’s disease, or syphilis; pharyngeal findings supporting mononucleosis; murmurs or embolic phenomena supporting endocarditis, Bartonella, or brucellosis; jaundice supporting viral hepatitis, cholangitis, or leptospirosis; conjunctival suffusion supporting leptospirosis; and joint findings supporting rheumatoid arthritis, lupus, or Still’s disease.
Diagnostic Tests and Interpretation
Laboratory Studies
Leukocytosis with a left shift supports bacterial infection. Marked lymphocytosis with atypical lymphocytes on smear supports infectious mononucleosis and can be confirmed early with heterophile antibody testing or with EBV viral capsid antigen IgM. Eosinophilia can accompany certain parasitic causes of hepatosplenomegaly but is not typical of amoebic infection. Three sets of blood cultures off antibiotics help exclude most endocarditis, while Bartonella, Brucella, and Q fever are better assessed by serology. Based on exposure history, obtain HIV, syphilis, and viral hepatitis testing, and consider serologies for rickettsial disease, Entamoeba, toxoplasma, schistosomiasis, Q fever, Fasciola, leptospirosis, and ehrlichiosis, along with blood films for malaria and babesiosis. Include biochemistry, autoimmune markers, and ferritin when inflammatory disease is considered. If imaging identifies an abscess, image-guided aspiration can establish diagnosis. Excisional lymph node biopsy or liver biopsy offers the highest yield for lymphoma. Bone marrow biopsy or splenic aspirate can diagnose leishmaniasis, with PCR or serology as alternatives.
Imaging
Ultrasound can confirm enlargement and identify causes such as abscess, hepatocellular carcinoma, or biliary pathology. Contrast-enhanced CT is helpful when ultrasound is nondiagnostic and suspicion remains for focal lesions or lymphoma. MRI is rarely needed but may help distinguish abscess from malignancy.
Treatment
Medications
Therapy is directed by the underlying diagnosis. Confirmed liver abscess requires antibiotics targeting likely organisms; pyogenic abscess is generally managed with percutaneous drainage plus antibiotics, with surgery reserved for failed drainage or complex multiloculated disease. Praziquantel is effective for Schistosoma mansoni in advanced hepatosplenic disease and is preferred when Schistosoma haematobium coinfection is present. Fascioliasis is typically treated with triclabendazole 10 mg/kg for one to two days; bithionol is an alternative, and the role of praziquantel is uncertain.
Ongoing Care and Follow-Up
Advise patients with splenomegaly to avoid contact sports and monitor for spontaneous rupture, which almost always presents with severe upper abdominal pain that often starts in the left upper quadrant, spreads more diffusely, and can radiate to the left shoulder.
Complications
In the United States, spontaneous splenic rupture is most commonly associated with infectious mononucleosis. Although rare, occurring in a small fraction of mononucleosis cases, it is the leading cause of death related to infectious mononucleosis.
0 Comments
