Accessory spleen: Difference between revisions
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== | {{Infobox medical condition | ||
| name = Accessory spleen | |||
| image = [[File:CT_scan_of_an_accessory_spleen.jpg|250px]] | |||
| caption = CT scan showing an accessory spleen | |||
| field = [[Gastroenterology]], [[Hematology]] | |||
| synonyms = Splenunculus, supernumerary spleen | |||
| symptoms = Usually asymptomatic, may cause [[abdominal pain]] if torsion occurs | |||
| complications = [[Splenic torsion]], [[infarction]] | |||
| onset = Congenital | |||
| duration = Lifelong | |||
| causes = Developmental anomaly | |||
| risks = None specific, incidental finding | |||
| diagnosis = [[Ultrasound]], [[CT scan]], [[MRI]] | |||
| differential = [[Splenosis]], [[lymphadenopathy]], [[neoplasm]] | |||
| treatment = Usually none required, [[surgery]] if symptomatic | |||
| prognosis = Excellent if asymptomatic | |||
| frequency = Found in approximately 10-30% of the population | |||
}} | |||
<gallery> | |||
File:Gross_pathology_of_an_accessory_spleen.jpg|Thumb|right|Gross pathology of an accessory spleen | |||
File:Splenunculus_(accessory_spleen)_photomicrograph.JPG|Photomicrograph of a splenunculus | |||
File:Nebenmilz.jpg|Accessory spleen (Nebenmilz) | |||
File:Hypertrophic_accessory_spleen_with_hematoma.jpg|Hypertrophic accessory spleen with hematoma | |||
</gallery> | |||
An '''accessory spleen''' is a small nodule of splenic tissue that is separate from the main body of the [[spleen]]. It is a common congenital anomaly, occurring in approximately 10-30% of the population. Accessory spleens are usually asymptomatic and are often discovered incidentally during imaging studies or surgical procedures. | An '''accessory spleen''' is a small nodule of splenic tissue that is separate from the main body of the [[spleen]]. It is a common congenital anomaly, occurring in approximately 10-30% of the population. Accessory spleens are usually asymptomatic and are often discovered incidentally during imaging studies or surgical procedures. | ||
==Anatomy and Location== | ==Anatomy and Location== | ||
Accessory spleens are typically found near the [[hilum]] of the spleen, but they can also be located in other areas of the [[abdominal cavity]], such as the [[pancreas]], [[omentum]], or [[mesentery]]. They are usually small, ranging from a few millimeters to a few centimeters in diameter. | Accessory spleens are typically found near the [[hilum]] of the spleen, but they can also be located in other areas of the [[abdominal cavity]], such as the [[pancreas]], [[omentum]], or [[mesentery]]. They are usually small, ranging from a few millimeters to a few centimeters in diameter. | ||
==Development== | ==Development== | ||
Accessory spleens develop during embryogenesis when splenic tissue becomes separated from the main body of the spleen. This can occur due to incomplete fusion of the splenic anlage or due to the presence of multiple splenic nodules during development. | Accessory spleens develop during embryogenesis when splenic tissue becomes separated from the main body of the spleen. This can occur due to incomplete fusion of the splenic anlage or due to the presence of multiple splenic nodules during development. | ||
==Clinical Significance== | ==Clinical Significance== | ||
While accessory spleens are generally benign and asymptomatic, they can become clinically significant in certain situations. For example, in patients undergoing [[splenectomy]] for conditions such as [[idiopathic thrombocytopenic purpura]] (ITP), an accessory spleen can continue to produce [[platelets]], potentially leading to a recurrence of symptoms. In such cases, identification and removal of the accessory spleen may be necessary. | While accessory spleens are generally benign and asymptomatic, they can become clinically significant in certain situations. For example, in patients undergoing [[splenectomy]] for conditions such as [[idiopathic thrombocytopenic purpura]] (ITP), an accessory spleen can continue to produce [[platelets]], potentially leading to a recurrence of symptoms. In such cases, identification and removal of the accessory spleen may be necessary. | ||
==Diagnosis== | ==Diagnosis== | ||
Accessory spleens are often identified through imaging studies such as [[computed tomography]] (CT) scans, [[magnetic resonance imaging]] (MRI), or [[ultrasound]]. On imaging, they appear as well-defined, homogeneous nodules with similar characteristics to the main spleen. | Accessory spleens are often identified through imaging studies such as [[computed tomography]] (CT) scans, [[magnetic resonance imaging]] (MRI), or [[ultrasound]]. On imaging, they appear as well-defined, homogeneous nodules with similar characteristics to the main spleen. | ||
==Treatment== | ==Treatment== | ||
In most cases, accessory spleens do not require treatment. However, if they cause symptoms or complications, surgical removal may be indicated. This is typically done laparoscopically. | In most cases, accessory spleens do not require treatment. However, if they cause symptoms or complications, surgical removal may be indicated. This is typically done laparoscopically. | ||
==Related Pages== | ==Related Pages== | ||
* [[Spleen]] | * [[Spleen]] | ||
* [[Splenectomy]] | * [[Splenectomy]] | ||
* [[Idiopathic thrombocytopenic purpura]] | * [[Idiopathic thrombocytopenic purpura]] | ||
* [[Congenital anomalies]] | * [[Congenital anomalies]] | ||
[[Category:Congenital disorders of digestive system]] | [[Category:Congenital disorders of digestive system]] | ||
[[Category:Spleen]] | [[Category:Spleen]] | ||
Latest revision as of 23:54, 3 April 2025
| Accessory spleen | |
|---|---|
| File:CT scan of an accessory spleen.jpg | |
| Synonyms | Splenunculus, supernumerary spleen |
| Pronounce | N/A |
| Specialty | N/A |
| Symptoms | Usually asymptomatic, may cause abdominal pain if torsion occurs |
| Complications | Splenic torsion, infarction |
| Onset | Congenital |
| Duration | Lifelong |
| Types | N/A |
| Causes | Developmental anomaly |
| Risks | None specific, incidental finding |
| Diagnosis | Ultrasound, CT scan, MRI |
| Differential diagnosis | Splenosis, lymphadenopathy, neoplasm |
| Prevention | N/A |
| Treatment | Usually none required, surgery if symptomatic |
| Medication | N/A |
| Prognosis | Excellent if asymptomatic |
| Frequency | Found in approximately 10-30% of the population |
| Deaths | N/A |
-
Gross pathology of an accessory spleen
-
Photomicrograph of a splenunculus
-
Accessory spleen (Nebenmilz)
-
Hypertrophic accessory spleen with hematoma
An accessory spleen is a small nodule of splenic tissue that is separate from the main body of the spleen. It is a common congenital anomaly, occurring in approximately 10-30% of the population. Accessory spleens are usually asymptomatic and are often discovered incidentally during imaging studies or surgical procedures.
Anatomy and Location[edit]
Accessory spleens are typically found near the hilum of the spleen, but they can also be located in other areas of the abdominal cavity, such as the pancreas, omentum, or mesentery. They are usually small, ranging from a few millimeters to a few centimeters in diameter.
Development[edit]
Accessory spleens develop during embryogenesis when splenic tissue becomes separated from the main body of the spleen. This can occur due to incomplete fusion of the splenic anlage or due to the presence of multiple splenic nodules during development.
Clinical Significance[edit]
While accessory spleens are generally benign and asymptomatic, they can become clinically significant in certain situations. For example, in patients undergoing splenectomy for conditions such as idiopathic thrombocytopenic purpura (ITP), an accessory spleen can continue to produce platelets, potentially leading to a recurrence of symptoms. In such cases, identification and removal of the accessory spleen may be necessary.
Diagnosis[edit]
Accessory spleens are often identified through imaging studies such as computed tomography (CT) scans, magnetic resonance imaging (MRI), or ultrasound. On imaging, they appear as well-defined, homogeneous nodules with similar characteristics to the main spleen.
Treatment[edit]
In most cases, accessory spleens do not require treatment. However, if they cause symptoms or complications, surgical removal may be indicated. This is typically done laparoscopically.
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