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Pathology - Primary Hyperparathyroidism
The signs and symptoms are related to how hypercalcemia manifests in the skeletal and urinary systems. People frequently employ the well-known acronym "bones, stones, abdominal groans, and psychiatric moans." The primary characteristic is elevated serum PTH and hypercalcemia. One parathyroid gland adenoma, located in over 80% of cases, is the cause of the illness. Similar symptoms characterize hypercalcemia associated with malignancy, which is brought on by PTH-related peptide (PTH-rp) secreted by tumors. There is feedback inhibition of endogenous PTH in these circumstances. Renal stone development is more likely in people with hypercalcemia. Loss of cortical bone commonly results in reduced bone density, which mostly affects the wrists and hips. PTH typically enhances renal calcium absorption; however, high calcium plasma concentrations also produce increased renal calcium filtration, which exceeds tubular reabsorptive capacity and results in hypercalciuria.
Low serum phosphate and elevated urine phosphate are caused by PTH's suppression of renal phosphate reabsorption. Because of the decreased activity of excitable tissues caused by hypercalcemia, bradycardia, first-degree heart block (in this instance), depressed reflexes, CNS symptoms, and decreased GI motility can all be explained. Nephrogenic DI is also brought on by hypercalcemia, which prevents vasopressin from acting at the kidney. In mild situations, high fluid intake and dietary calcium restriction are the main forms of treatment; in certain circumstances, surgical removal of one or more parathyroid glands is performed.
The signs and symptoms are related to how hypercalcemia manifests in the skeletal and urinary systems. People frequently employ the well-known acronym "bones, stones, abdominal groans, and psychiatric moans." The primary characteristic is elevated serum PTH and hypercalcemia. One parathyroid gland adenoma, located in over 80% of cases, is the cause of the illness. Similar symptoms characterize hypercalcemia associated with malignancy, which is brought on by PTH-related peptide (PTH-rp) secreted by tumors. There is feedback inhibition of endogenous PTH in these circumstances. Renal stone development is more likely in people with hypercalcemia. Loss of cortical bone commonly results in reduced bone density, which mostly affects the wrists and hips. PTH typically enhances renal calcium absorption; however, high calcium plasma concentrations also produce increased renal calcium filtration, which exceeds tubular reabsorptive capacity and results in hypercalciuria.
Low serum phosphate and elevated urine phosphate are caused by PTH's suppression of renal phosphate reabsorption. Because of the decreased activity of excitable tissues caused by hypercalcemia, bradycardia, first-degree heart block (in this instance), depressed reflexes, CNS symptoms, and decreased GI motility can all be explained. Nephrogenic DI is also brought on by hypercalcemia, which prevents vasopressin from acting at the kidney. In mild situations, high fluid intake and dietary calcium restriction are the main forms of treatment; in certain circumstances, surgical removal of one or more parathyroid glands is performed.
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Pathology - Myasthenia Gravis
Pathophysiology
At the neuromuscular junction, an antibody-mediated response is the source of the pathophysiology of MG.
Though they can potentially target muscle fibers or receptor tyrosine kinases unique to a particular muscle, antibodies are most frequently directed against acetylcholine receptors on the postsynaptic membrane. The action potential is transmitted and depolarized when ACh binds to its postsynaptic receptor in patients without MG; however, this reaction is attenuated by the antibodies generated in MG. Patients who are active tend to develop weaker with time and are more prone to weariness. Individuals may have diplopia, eyelid droop, dysphagia, dysarthria, or respiratory discomfort in addition to ocular muscle weakness. This is more common towards the end of the day. Since diaphragmatic involvement can be lethal, respiratory stabilization is the primary focus of patient care for MG patients. To raise the quantity of acetylcholine at the motor end plate, acetylcholinesterase inhibitors, such as pyridostigmine, are employed. In circumstances where symptoms are life-threatening, intravenous immunoglobulin (IVIG) or plasma exchange may be able to temporarily relieve them. For cases like this one, surgical thymoma resection is a curative treatment when thymoma on imaging is documented.
Pathophysiology
At the neuromuscular junction, an antibody-mediated response is the source of the pathophysiology of MG.
Though they can potentially target muscle fibers or receptor tyrosine kinases unique to a particular muscle, antibodies are most frequently directed against acetylcholine receptors on the postsynaptic membrane. The action potential is transmitted and depolarized when ACh binds to its postsynaptic receptor in patients without MG; however, this reaction is attenuated by the antibodies generated in MG. Patients who are active tend to develop weaker with time and are more prone to weariness. Individuals may have diplopia, eyelid droop, dysphagia, dysarthria, or respiratory discomfort in addition to ocular muscle weakness. This is more common towards the end of the day. Since diaphragmatic involvement can be lethal, respiratory stabilization is the primary focus of patient care for MG patients. To raise the quantity of acetylcholine at the motor end plate, acetylcholinesterase inhibitors, such as pyridostigmine, are employed. In circumstances where symptoms are life-threatening, intravenous immunoglobulin (IVIG) or plasma exchange may be able to temporarily relieve them. For cases like this one, surgical thymoma resection is a curative treatment when thymoma on imaging is documented.
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Pathology - Spinal lumbar stenosis
Pathogenesis
In these situations, it's critical to differentiate between neurogenic claudication and vascular claudication. Vascular claudication only needs to be stopped, whereas neurogenic claudication usually goes away with a change in posture. Furthermore, walking uphill and with hip flexion reduces the pain associated with neurogenic claudication. Neural ischemia, which is the root cause of claudication, is brought on by surrounding tissues compressing the spinal nerves. Other neurologic symptoms that patients may experience include paresthesias and incontinence. An MRI can confirm the diagnosis by demonstrating compression of the spinal nerves as they leave the spinal canal or of the spinal canal centrally. Compression of the spinal nerves can also result from herniated nucleus pulposus and bony spurs of the spine. Decompressive laminectomy is a possibility if conservative measures, such as physical therapy, neuropathic and anti-inflammatory pain drugs, and steroid injections, are ineffective.
Pathogenesis
In these situations, it's critical to differentiate between neurogenic claudication and vascular claudication. Vascular claudication only needs to be stopped, whereas neurogenic claudication usually goes away with a change in posture. Furthermore, walking uphill and with hip flexion reduces the pain associated with neurogenic claudication. Neural ischemia, which is the root cause of claudication, is brought on by surrounding tissues compressing the spinal nerves. Other neurologic symptoms that patients may experience include paresthesias and incontinence. An MRI can confirm the diagnosis by demonstrating compression of the spinal nerves as they leave the spinal canal or of the spinal canal centrally. Compression of the spinal nerves can also result from herniated nucleus pulposus and bony spurs of the spine. Decompressive laminectomy is a possibility if conservative measures, such as physical therapy, neuropathic and anti-inflammatory pain drugs, and steroid injections, are ineffective.
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Pathology - Migraine Headache
Pathophysiology
Although the exact cause of migraines is unknown, the body of research now available points to vasospasm and the production of chemical cytokines as the source of pain.
Migraines are more common in women and can linger for hours or even days.
Usually one-sided, the headache may have an aura before it starts. Additional characteristics include a sensitivity to sound (phonophobia) and light (photophobia). Prophylactic drugs like ergots and abortive medications like triptans make up standard treatment. Injections of botulinum toxin are among the most recent treatments for migraines that don't respond to conventional therapies. It is noteworthy that migraineurs may experience physical debilitation and that their functionality may be affected.
Pathophysiology
Although the exact cause of migraines is unknown, the body of research now available points to vasospasm and the production of chemical cytokines as the source of pain.
Migraines are more common in women and can linger for hours or even days.
Usually one-sided, the headache may have an aura before it starts. Additional characteristics include a sensitivity to sound (phonophobia) and light (photophobia). Prophylactic drugs like ergots and abortive medications like triptans make up standard treatment. Injections of botulinum toxin are among the most recent treatments for migraines that don't respond to conventional therapies. It is noteworthy that migraineurs may experience physical debilitation and that their functionality may be affected.
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Pathology - Trigeminal Neuralgia (TN).
The trigeminal nerve may become demyelinated, a tumor or aneurysm may compress the nerve, or there may be a lesion of the cerebellopontine angle. Patients with multiple sclerosis may also have TN.
It's crucial to get a complete medical history since patients with postherpetic neuralgia, or neuralgia brought on by damage after an infection with the herpes zoster virus, may exhibit symptoms that resemble those of TN. Although gabapentin and other drugs for neuropathic pain can help some people, carbamazepine is the preferred medication for treatment. Surgery can offer people with structural problems as the cause of their TN relief right away.
Radiosurgery can also be used to treat situations that are resistant.
The trigeminal nerve may become demyelinated, a tumor or aneurysm may compress the nerve, or there may be a lesion of the cerebellopontine angle. Patients with multiple sclerosis may also have TN.
It's crucial to get a complete medical history since patients with postherpetic neuralgia, or neuralgia brought on by damage after an infection with the herpes zoster virus, may exhibit symptoms that resemble those of TN. Although gabapentin and other drugs for neuropathic pain can help some people, carbamazepine is the preferred medication for treatment. Surgery can offer people with structural problems as the cause of their TN relief right away.
Radiosurgery can also be used to treat situations that are resistant.
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Pathology - Temporal Arteritis
Pathophysiology
Giant cell arteritis (GCA) is another name for temporal arteritis.
Temporal artery disease is a common symptom of systemic vasculitis, or GCA. Moreover, polymyalgia rheumatica, which affects the hips and shoulders, is closely linked to it. This disease causes inflammation in the arteries, which may lead to distal ischemia. It is possible for other carotid branches to become involved as well; blindness may result from ocular artery irritation.
Consequently, it's critical to start high-dose steroid treatment right away. Intravenous steroids may be beneficial if the patient has visual impairment. If the sample is obtained within a few days of the start of treatment, the use of steroids has no effect on the results of the biopsy.
Biopsies reveal big cells and granulomatous alterations, although a negative biopsy does not always rule out a diagnosis of GCA. This is because the regions collected during the biopsy may not contain the areas of inflammation, and the inflammation manifests themselves as skip lesions.
Pathophysiology
Giant cell arteritis (GCA) is another name for temporal arteritis.
Temporal artery disease is a common symptom of systemic vasculitis, or GCA. Moreover, polymyalgia rheumatica, which affects the hips and shoulders, is closely linked to it. This disease causes inflammation in the arteries, which may lead to distal ischemia. It is possible for other carotid branches to become involved as well; blindness may result from ocular artery irritation.
Consequently, it's critical to start high-dose steroid treatment right away. Intravenous steroids may be beneficial if the patient has visual impairment. If the sample is obtained within a few days of the start of treatment, the use of steroids has no effect on the results of the biopsy.
Biopsies reveal big cells and granulomatous alterations, although a negative biopsy does not always rule out a diagnosis of GCA. This is because the regions collected during the biopsy may not contain the areas of inflammation, and the inflammation manifests themselves as skip lesions.
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Pathology - Multiple Sclerosis
Pathophysiology
Even though the precise cause of this illness is still unknown, it is thought that multiple sclerosis has an immunological basis and that a distant Epstein-Barr virus (EBV) infection may be involved. Because of antibodies against myelin basic protein, neurons get demyelinated, resulting in CNS lesions. A wide spectrum of remitting and relapsing symptoms are found in patients, and the symptoms typically correspond physically with the lesions. Any patient exhibiting various neurologic abnormalities that cannot be explained by a single nervous system lesion should be suspected of having multiple sclerosis. Regardless of where the lesions originate, CSF examination can reveal oligoclonal bands even though the lesions are physically and temporally separate. Patients presenting with problems related to the eyes may also have internuclear ophthalmoplegia, which is caused by lesions originating in the medial longitudinal fasciculus (MLF), in addition to optic neuritis resulting in blurred vision. Due to a right MLF lesion, this patient presents with symptoms of both internuclear ophthalmoplegia and optic neuritis. Glatiramer acetate, which reduces the frequency of relapses, and interferon beta are considered gold standard therapy. Natrizumab, a monoclonal antibody targeting a cell adhesion molecule, and fingolimod, an immunomodulator generated from fungi, are two of the more recent treatments that have been developed.
Pathophysiology
Even though the precise cause of this illness is still unknown, it is thought that multiple sclerosis has an immunological basis and that a distant Epstein-Barr virus (EBV) infection may be involved. Because of antibodies against myelin basic protein, neurons get demyelinated, resulting in CNS lesions. A wide spectrum of remitting and relapsing symptoms are found in patients, and the symptoms typically correspond physically with the lesions. Any patient exhibiting various neurologic abnormalities that cannot be explained by a single nervous system lesion should be suspected of having multiple sclerosis. Regardless of where the lesions originate, CSF examination can reveal oligoclonal bands even though the lesions are physically and temporally separate. Patients presenting with problems related to the eyes may also have internuclear ophthalmoplegia, which is caused by lesions originating in the medial longitudinal fasciculus (MLF), in addition to optic neuritis resulting in blurred vision. Due to a right MLF lesion, this patient presents with symptoms of both internuclear ophthalmoplegia and optic neuritis. Glatiramer acetate, which reduces the frequency of relapses, and interferon beta are considered gold standard therapy. Natrizumab, a monoclonal antibody targeting a cell adhesion molecule, and fingolimod, an immunomodulator generated from fungi, are two of the more recent treatments that have been developed.
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Pathology - Guillain-Barré Syndrome
Pathophysiology
Peripheral demyelinating disease is known as Guillain-Barré syndrome (GBS). Usually, these individuals arrive with rapidly developing ascending paralysis. The disease's genesis is believed to be autoimmune, and several cases have been linked to different gastrointestinal tract illnesses. Given the patient's history of diarrhea and abdominal pain, Campylobacter jejuni is the most often encountered infection linked to GBS. The CSF analysis, which demonstrates albuminocytologic dissociation, is the cornerstone of the diagnostic assessment. This indicates that although the cell count is within the normal range, the protein is high. It is best to exclude out infectious etiologies if the cell count is increased. In order to treat GBS, either quick plasmapheresis to eliminate antibodies or IVIG injection to bind antibodies are necessary.
Pathophysiology
Peripheral demyelinating disease is known as Guillain-Barré syndrome (GBS). Usually, these individuals arrive with rapidly developing ascending paralysis. The disease's genesis is believed to be autoimmune, and several cases have been linked to different gastrointestinal tract illnesses. Given the patient's history of diarrhea and abdominal pain, Campylobacter jejuni is the most often encountered infection linked to GBS. The CSF analysis, which demonstrates albuminocytologic dissociation, is the cornerstone of the diagnostic assessment. This indicates that although the cell count is within the normal range, the protein is high. It is best to exclude out infectious etiologies if the cell count is increased. In order to treat GBS, either quick plasmapheresis to eliminate antibodies or IVIG injection to bind antibodies are necessary.
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Pathology - Amyotrophic Lateral Sclerosis
Pathophysiology
Lou Gehrig's disease, is also commonly known as amyotrophic lateral sclerosis . The distinct feature of this disease lies in its manifestation of symptoms affecting both upper and lower motor neurons, which can be attributed to involvement of the corticospinal tract fibers. The symptoms of upper motor neurons include spasticity, positive Babinski sign, and hyperreflexia.
Findings related to lower motor neurons include atrophy brought on by muscular denervation and fasciculations. This illness has been linked to mutations in superoxide dismutase, a catalyst with antioxidant properties. Progressive involvement of the brain stem might result in aphasia and dysphagia. The prognosis is bleak; respiratory failure usually results in death within a few years of diagnosis.
Pathophysiology
Lou Gehrig's disease, is also commonly known as amyotrophic lateral sclerosis . The distinct feature of this disease lies in its manifestation of symptoms affecting both upper and lower motor neurons, which can be attributed to involvement of the corticospinal tract fibers. The symptoms of upper motor neurons include spasticity, positive Babinski sign, and hyperreflexia.
Findings related to lower motor neurons include atrophy brought on by muscular denervation and fasciculations. This illness has been linked to mutations in superoxide dismutase, a catalyst with antioxidant properties. Progressive involvement of the brain stem might result in aphasia and dysphagia. The prognosis is bleak; respiratory failure usually results in death within a few years of diagnosis.
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Pathology - Brown-Séquard Syndrome
Pathophysiology
Hemisection of the spinal cord laterally causes Brown-Séquard syndrome. The corticospinal tract fibers, which decussate at the level of the medulla, are severed, resulting in paralysis. The dorsal column/medial lemniscal route is severed, and this leads to a decrease in vibration and proprioception. The pathway also decusses at the medulla level. Severing the spinothalamic tract at the point where it enters the spinal cord causes a reduction in pain perception. This results in the ipsilateral paralysis, reduced vibration/proprioception, and contralateral loss of pain/temperature sensation, which are the hallmark signs of Brown-Séquard syndrome.
Pathophysiology
Hemisection of the spinal cord laterally causes Brown-Séquard syndrome. The corticospinal tract fibers, which decussate at the level of the medulla, are severed, resulting in paralysis. The dorsal column/medial lemniscal route is severed, and this leads to a decrease in vibration and proprioception. The pathway also decusses at the medulla level. Severing the spinothalamic tract at the point where it enters the spinal cord causes a reduction in pain perception. This results in the ipsilateral paralysis, reduced vibration/proprioception, and contralateral loss of pain/temperature sensation, which are the hallmark signs of Brown-Séquard syndrome.
