```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>Admit D-Aortic @17:50:11</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>2</hlevel>
            <item_name>Circulatory system</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Circulatory system (390-459)\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Circulatory system</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Admit Diagnosis</modifier_name>
                <modifier_key>\\i2b2_DIAG\Admit Diagnosis\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Circulatory system (390-459)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>2</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>4</hlevel>
            <item_name>Aortic aneurysm and dissection</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Circulatory system (390-459)\Arterial vascular disease (440-447)\(441) Aortic aneurysm and dissect~\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Circulatory system \ Arterial vascular disease \ Aortic aneurysm and dissection</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find all patients who have an admit diagnosis of Aortic aneurysm and dissection (ICD-9 code 41) within the Circulatory System (ICD-9 codes 390-459) category. The query will search for this specific diagnosis in the i2b2 database, and the results will be accurate with a specificity scale of 100 and a sensitivity scale of 0. The timing of the query is set to ANY, meaning it will search for this diagnosis regardless of when it was recorded in the patient's medical record. The query is made up of two panels, the first panel constrains the diagnosis to the Circulatory System category, and the second panel narrows down the search to Aortic aneurysm and dissection within that category. The results will be displayed in the query builder's graphical interface with a tree-like structure, where the first panel represents the Circulatory System category and the second panel represents the Aortic aneurysm and dissection diagnosis.