What is the average adult spleen size?
12 cm – longitudinal
8 cm – transverse
4 cm – thickness
What is the largest lymphoid organ that filters damaged cells, micro organisms and particulate matter?
What are the indications for splenomegaly?
Longitudinal measurement greater than 12 cm or if the spleen is inferior to the lower pole of the left kidney
When is the left lobe of the liver seen anterior to the spleen?
If the left lobe is enlarged
Third trimester pregnancy
Where are the fundus of the stomach, lesser sac and pancreatic tail located in relation to the spleen?
Medial and anterior to the splenic hilum
What is a normal variant that is commonly found with a spleen?
Where are accessory spleens normally located?
Near the splenic hilum with identical echogenicity to the adjacent spleen
What are splenic granulomas?
Focal lesions resulting from previous infections
What are the most common causes of splenic granulomas?
Histoplasmosis and tuberculosis
What are some splenic calcifications associated with?
Splenic artery wall calcifications
Splenic artery aneurysms calcifications
Pneumocystis carinii infection
List examples of cystic lesions found in the spleen.
Autosomal dominant polycystic disease Hydatid cysts Epidermoid cysts Liquefied infarcts or hematomas Pancreatic pseudocysts
What are epidermoid cysts of the spleen?
True cysts lined by squamous epithelium
What are the most common benign primary neoplasms of the spleen?
What is the most common metastases to the spleen?
How do you metastatic lesions commonly appear in the spleen on ultrasound?
Hypoechoic, but the appearance may vary