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​Pathology - Aortic Dissection
Hypertension, trauma, Marfan syndrome, Ehlers-Danlos syndrome, coarctation of the aorta, bicuspid aortic valve, and the last trimester of pregnancy are all linked to this condition. However, there is no connection with atherosclerosis.

Study of diseases and their effects on the body. 
Gross Anatomy: There is a tear in the inner layer of the aorta, which has led to the formation of a hematoma within the wall of the aorta. There is also a possibility of the presence of cystic medial necrosis, which is a condition that makes the aorta more prone to dissection, characterized by the separation of the elastic and muscular components of the middle layer of the aorta.

Symptoms and signs 
The individual experiences abrupt and intense left-sided chest discomfort, which frequently spreads to the back. Over time, the pain gradually moves downwards.
One of the complications that can arise is a condition called aortic valve insufficiency. The presence of dissection in a coronary artery or aortic rupture typically results in hemopericardium, cardiac tamponade, and ultimately, fatality.

Therapy
Surgical restoration If the dissection includes the ascending aorta or if there is substantial involvement of branch arteries, it is necessary to maintain rigorous control of heart rate and blood pressure using beta-blockers, ACE inhibitors, and nitroprusside.

Aortic dissections can be categorized as either type A, which involves both the ascending and descending aorta, or type B, which only involves the descending aorta.
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​Pathology - Polyarteritis Nodosa 
Polyarteritis Nodosa is a medical condition characterized by inflammation of the blood vessels.
The cause of this condition is currently unidentified, but it is linked to hepatitis B virus (HBV) infection in 30% to 50% of individuals.
It primarily impacts men in their middle age, but it can also occur in individuals of any age and gender.

Pathology 
Gross Pathology: Impacts muscular arteries of small or medium size, particularly at the junctions of vessels in the kidney, heart, liver, or gastrointestinal tract. The lesions vary in age.
Study of cellular and tissue abnormalities at a microscopic level. The artery wall is experiencing inflammation that affects all layers, with the presence of neutrophils, eosinophils, and mononuclear cells infiltrating the area. Fibrinoid necrosis may be observed.

Clinical manifestations and indications 
The patient presents with fever, unintentional weight loss, general discomfort, abdominal pain accompanied by nausea and vomiting, joint pain, kidney failure, nerve damage, high blood pressure, cotton-wool spots in the retina, inflammation of the heart muscle and the outer lining of the heart, and the presence of small purple spots that may be felt on the skin.
Laboratory results: Increased erythrocyte sedimentation rate (ESR) with elevated white blood cell count (leukocytosis)

Treatment options include the use of corticosteroids, azathioprine, cyclophosphamide, and antiviral treatment for HBV-related conditions.
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​Pathology - Churg - Strauss Vasculitis 
Churg-Strauss Vasculitis is a medical condition characterized by inflammation of blood vessels. The exact cause of this condition is still unknown. However, it is believed that a certain type of immune system dysfunction has a role in the development of the disease.
It primarily impacts middle-aged males but can manifest in individuals of any age and gender.

Study of diseases and their effects on the body. 
Gross Pathology: Impacts muscle arteries and veins of small to medium size, particularly in the lung, kidney, heart, spleen, nerves, skin, or gastrointestinal system.
Microscopic Pathology: Arterial wall inflammation characterized by a preference for lymphocytic (and eosinophilic) infiltration in the outer layer, with the possible presence of fibrinoid necrosis.

Clinical manifestations 
Late-onset asthma is typically characterized by classical symptoms. Sinusitis and rhinitis. The patient exhibits lung involvement characterized by the presence of pulmonary infiltrates, which manifest as a cough. Additionally, the patient also experiences polyneuropathy, specifically mononeuritis multiplex. Additionally, one may see the presence of purpura and arthralgias.
Laboratory results: Increased erythrocyte sedimentation rate (ESR), elevated levels of eosinophils, and p-ANCA positivity observed in 40% of patients.

Treatment: Administering high doses of corticosteroids, specifically cyclophosphamide.
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​Pathology - Wegener Granulomatosis 
Attributable to an immunologic mechanism, potentially a hypersensitivity reaction.
Primarily affects males between the ages of 40 and 60, however it can manifest at any age.

Study of the nature and causes of diseases. 
Gross Pathology: Vascular granulomatous lesions observed in the upper respiratory tract, lungs, and kidney.
Study of cellular and tissue abnormalities at a microscopic level. The presence of necrotizing granulomas characterized by a central area of necrosis surrounded by lymphocytes. The presence of macrophages and large cells within the vascular walls, together with granulomatous vasculitis characterized by an inflammatory infiltrate surrounded by fibroplastic growth, is observed. Additionally, there is evidence of rapidly increasing glomerulonephritis in the renal biopsy.

Clinical manifestations and indications 
Nasal septum perforation, chronic sinusitis, otitis media, difficulty breathing, coughing up blood, blood in urine, skin rash, muscle pain, heightened risk of deep vein thrombosis.
Complications encompass renal failure, sometimes known as nephritic syndrome, as well as hearing.
Imaging: Chest X-ray reveals prominent nodular opacities.
Laboratory results: The patient has a positive c-ANCA result and the presence of red blood cells and/or red blood cell casts in their urine.

Treatment: The first therapy involves the use of cyclophosphamide and/or prednisone, while methotrexate is used for maintenance therapy.

Microscopic polvangitis is a type of inflammation in the small blood vessels that causes tissue death. It is characterized by the rapid progression of kidney inflammation and involvement of the lungs. The biopsy reveals a condition characterized by the death of tissue and a low immune response in the small blood arteries, without the presence of granulomas. This condition is linked to a positive p-ANCA and is managed using cyclophosphamide and corticosteroids.
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​Pathology - Giant Cell Arteritis 
Giant-Cell Arteritis The cause of this condition is still unknown, although it has been postulated that it may be due to T-cell-mediated damage.
Typically, this condition mostly impacts those over the age of 50 and is more prevalent among women.

Pathology  
Gross Pathology: Impacts arteries of small to medium size, typically branches of the carotid artery, particularly the temporal artery.
Study of cellular and tissue abnormalities at a microscopic level. The medium is experiencing granulomatous inflammation characterized by the presence of mononuclear infiltration and large cells.

Clinical manifestations and indications 
The patient presents with a throbbing headache on one side of the head, accompanied by sensitive nodules along the path of the temporal artery. They also have pain in the jaw when chewing, as well as reduced eyesight due to blockage of the ocular artery.
Systemic polymyalgia rheumatica, characterized by pain and stiffness in proximal muscles (such as shoulder and pelvic muscles), is observed in 50% of patients, with the symptoms being most typically experienced in the mornings.
Laboratory results: Significantly increased erythrocyte sedimentation rate (ESR)

Treatment: Corticosteroids
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​Pathology - Takayasu Arteritis
The cause is yet unidentified, although it is believed that immunological systems may be involved.
Primarily impacts females in their thirties to fifties.

Study of the nature and causes of diseases. 
Gross Pathology: This condition involves the disease of medium and big arteries, which leads to the thickening of the aortic arch or the proximal great vessels, culminating in vascular insufficiency.
Study of cellular and tissue abnormalities at a microscopic level. The tissue sample shows the presence of a single kind of immune cells surrounding and cutting the small blood vessels in the outer layer and middle layer of the blood vessel wall, as well as the formation of small nodules with large immune cells.

Symptoms and signs
The patient presents with fever, weak pulses in the upper extremities (known as "pulseless disease"), joint pain, fainting, skin nodules, excessive sweating at night, difficulty walking due to pain (bruits may be detected over the subclavian arteries), and visual and neurological problems.
Laboratory findings: Significant increase in erythrocyte sedimentation rate (ESR)

Treatment options for this condition include the administration of corticosteroids. In more severe cases, additional medications such as cyclophosphamide or methotrexate may be necessary.
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​Pathology - Kawasaki Disease 
The cause is yet unidentified, although a malfunction in the regulation of the immune system is seen as a possible explanation.
Typically impacts infants and young children under the age of 5.

Study of diseases and their effects on the body. 
Gross: Impacts vessels of small and medium size, including coronary arteries.
Microscopic: The vessel wall exhibits transmural inflammation and necrosis, accompanied by an infiltration of inflammatory cells.

Clinical manifestations 
The individual is experiencing symptoms such as fever, inflammation of the conjunctiva, lesions on the mucous membranes of the mouth, and swollen lymph nodes in the neck, typically affecting a single node. The individual is experiencing joint pain, swelling in the hands and feet, and redness on the palms and soles of the feet.
Possible complications encompass myocarditis and the formation of coronary artery aneurysms, which have the potential to burst and result in fatality.

Management 
Aspirin and intravenous gamma-globulin are used to prevent the development of coronary aneurysms.
The disease typically resolves on its own, but patients should undergo an echocardiography or cardiac CT scan to assess for proximal coronary aneurysms. 
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​Pathology - Polycythemia Vera 
Polycythemia Vera is a medical condition characterized by an abnormal increase in the number of red blood cells in the body.

Myeloproliferative disorder is a condition where there is abnormal growth of blood cells. In 95% of instances, this disorder is linked to a specific genetic mutation called JAK2V617F.
Most commonly observed in males who are middle-aged, overweight, and have hypertension.

Study of the nature and causes of diseases. 
Bone marrow: The bone marrow is characterized by a high number of cells, particularly erythroid precursor cells. There is also a rise in other types of blood-forming cells, such as megakaryocytes and myelocytes.
The patient presents with splenomegaly, pruritus, symptoms related to increased blood thickness such as headache and impaired vision, venous thrombosis, and bleeding.
Laboratory results include elevated hematocrit (Hct) and red blood cell (RBC) count, reduced levels of erythropoietin, elevated white blood cells (WBCs), increased platelets, elevated leukocyte alkaline phosphatase (LAP), increased serum vitamin B levels, and hyperuricemia.

Treatment options include phlebotomy, aspirin, and hydroxyurea in cases of thrombosis.

Polycythemia vera is classified as a myeloproliferative condition, along with essential thrombocythemia and myelofibrosis.
Essential thrombocythemia is a condition characterized by an abnormal increase in platelet count (thrombocytosis) and an excessive production of large bone marrow cells called megakaryocytes (megakaryocytosis). This condition typically manifests with both bleeding and the formation of blood clots (thrombosis).
Secondary polycythemia is characterized by an increase in the mass of blood cells due to an increase in the production of erythropoietin. This increase is induced by persistent hypoxia, renal illness, or Cushing syndrome.
Pathology - Polycythemia Vera  Polycythemia Vera is a medical condition characterized by an abnormal increase in the number of red blood cells in the body.  Myeloproliferative disorder is a condition where there is abnormal growth of blood cells. In 95% of instances, this disorder is linked to a specific genetic mutation called JAK2V617F. Most commonly observed in males who are middle-aged, overweight, and have hypertension.  Study of the nature and causes of diseases.  Bone marrow: The bone marrow is characterized by a high number of cells, particularly erythroid precursor cells. There is also a rise in other types of blood-forming cells, such as megakaryocytes and myelocytes. The patient presents with splenomegaly, pruritus, symptoms related to increased blood thickness such as headache and impaired vision, venous thrombosis, and bleeding. Laboratory results include elevated hematocrit (Hct) and red blood cell (RBC) count, reduced levels of erythropoietin, elevated white blood cells (WBCs), increased platelets, elevated leukocyte alkaline phosphatase (LAP), increased serum vitamin B levels, and hyperuricemia.  Treatment options include phlebotomy, aspirin, and hydroxyurea in cases of thrombosis.  Polycythemia vera is classified as a myeloproliferative condition, along with essential thrombocythemia and myelofibrosis. Essential thrombocythemia is a condition characterized by an abnormal increase in platelet count (thrombocytosis) and an excessive production of large bone marrow cells called megakaryocytes (megakaryocytosis). This condition typically manifests with both bleeding and the formation of blood clots (thrombosis). Secondary polycythemia is characterized by an increase in the mass of blood cells due to an increase in the production of erythropoietin. This increase is induced by persistent hypoxia, renal illness, or Cushing syndrome.
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​Pathology - Myelofibrosis with Myeloid Metaplasia
Fibroblastic proliferation in the bone occurs as a consequence of elevated secretion of PDGF and TGF-B.

Study of the nature and causes of diseases. 
Bone marrow: The bone marrow cavity is replaced by fibrous tissue, resulting in the loss of hematopoietic progenitor cells, save for an increase in megakaryocytes.
The liver and spleen undergo extramedullary hematopoiesis due to bone marrow depletion.
Peripheral blood smear reveals erythrocytes with a teardrop form, granulocyte precursor cells, nucleated red blood cells, and thrombocytosis with morphologically aberrant platelets.

Signs and symptoms 
The patient exhibits weariness and pallor, which are common symptoms of anemia. Additionally, the patient has a significantly enlarged spleen, known as massive splenomegaly. Laboratory tests reveal a decreased hematocrit (Hct) level.

Therapy 
Treatment options for bone marrow transplant include supportive care with transfusions, as well as the use of steroids or chemotherapeutic drugs.
Myelofibrosis is classified as a myeloproliferative condition, along with chronic myeloid leukemia (CML), essential thrombocythemia, and polycythemia vera.
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​Pathology - Hodgkin lymphoma
The cause is currently unknown, but EB infection has been suggested as a possible factor.
The typical occurrence is in a 20-year-old male, however Hodgkin lymphoma has a dual age distribution pattern, with a high incidence between 20 and 30 years and another peak after the age of 50.

Pathology 
The lymph node contains a type of cell called Reed-Sternberg cell. These cells are large and have several nuclei, with nucleoli that appear eosinophilic and resemble the eyes of an owl. It is believed that these cells originate from B-cells that express CD 30 and CD 15 proteins.
There are four different histologic variations. (1) Lymphocyte predominance: characterized by a high number of lymphocytes and a low number of Reed-Sternberg cells. (2) Nodular sclerosis: characterized by the presence of fibrous bands and a specific type of Reed-Sternberg cells called lacunar cells. (3) Mixed cellularity: characterized by the presence of eosinophils, plasma cells, Reed-Sternberg cells, and fibrosis. (4) Lymphocyte depletion: characterized by a low number of lymphocytes, a high number of Reed-Sternberg cells, and the occurrence of necrosis.

Presenting Symptoms 
The lymphadenopathy is typically painless and localized in the neck, appearing as a single group of nodes. It is accompanied by itching and an enlarged spleen.
Constitutional symptoms (B symptoms): Symptoms include a little increase in body temperature, excessive sweating during the night, and a reduction in body weight.

Therapeutic interventions 
Treatment methods include radiation therapy and chemotherapy.
A favorable prognosis (80% likelihood of cure) is linked to non-disseminated illness, the absence of B symptoms, and specific histologic characteristics (lymphocyte predominance and nodular sclerosis). While patients diagnosed with Hodgkin's lymphoma face the possibility of developing second malignancies such as acute leukemia or breast cancer, it is important to note that Hodgkin lymphoma typically spreads to nearby lymph nodes.
Women are more frequently observed to have the Nodular sclerosis histologic subtype of Hodgkin lymphoma.
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