304 Pathology > esophagus > Flashcards

esophagus Flashcards

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1
Q

From which embryologic structure and at what time does the esophagus develop?

A

A: The esophagus develops from the cranial part of the foregut during the 3rd week of gestation.

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2
Q

How does the early esophagus change in shape during development?

A

Initially, the pharynx is annular between the stomach, but with lung development and elongation of the neck, the esophagus acquires tubular properties.

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3
Q

How are the esophagus and trachea related early in development?

A

The cephaloid part of the esophagus and the trachea initially form a single canal, which is later divided into two by a septum in the 5th week of gestation.

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4
Q

What is the length of the esophagus in newborns and adults?

A

The esophagus measures about 10–11 cm in newborns and 23–25 cm in adults, extending from the pharynx to the gastroesophageal junction.

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5
Q

What type of epithelium lines the esophagus?

A

A: It is lined with nonkeratinized, multilayered squamous epithelium.

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6
Q

What are the layers of the esophageal wall?

A

The esophageal wall consists of the mucosa, submucosa, muscularis propria, and adventitia.

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7
Q

What is the clinical significance of the esophagus lacking a serosa?

A

Because the esophagus has no serosa, infections and tumors can spread easily.

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8
Q

Where are the upper and lower esophageal sphincters located?

A

The upper esophageal sphincter is at the level of the cricopharyngeal muscle, and the lower esophageal sphincter is at the proximal gastroesophageal junction.

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9
Q

What is esophageal atresia and how does it appear anatomically?

A

Esophageal atresia is a congenital anomaly where part of the esophagus forms a thin, ductless cord, with blind-ended sacs in the upper and lower parts; the proximal blind end connects to the pharynx and the distal blunt end connects to the stomach.

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10
Q

How are esophageal atresia and tracheoesophageal fistula classified?

A

They are usually fistulized with the trachea and classified into five types:
Blind upper and lower ends,
Fistula between the upper blind end and the trachea,
Fistula between the upper blind end, lower end, and trachea (most common),
Only a blind upper end,
Fistula in the middle with a patent trachea.

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11
Q

What are the clinical features and associations of esophageal atresia and fistulae?

A

They cause polyhydramnios during pregnancy and present after birth with regurgitation, aspiration, and cyanosis during feeding; the condition requires immediate correction and is incompatible with life, and may be associated with congenital heart defects, genitourinary malformations, and neurological diseases.

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12
Q

What is ectopia as a congenital anomaly of the esophagus?

A

A: Ectopia refers to the presence of normal tissue in an abnormal location within the esophagus.

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13
Q

What is the most common type of ectopia seen in the esophagus?

A

The most common ectopia is ectopic gastric mucosa.

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14
Q

Where is ectopic gastric mucosa most commonly located in the esophagus?

A

It is most commonly found in the upper one-third of the esophagus and is called an inlet patch.

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15
Q

What other types of ectopic tissues can be found in the esophagus?

A

Ectopic pancreatic tissue and ectopic sebaceous glands may also be found.

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16
Q

How are esophageal obstructions classified?

A

Esophageal obstructions are classified as mechanical or functional.

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17
Q

What are the causes of mechanical esophageal obstruction?

A

Mechanical obstruction may be caused by stenosis due to webs, rings, cancer, or strictures.

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18
Q

What causes functional esophageal obstruction?

A

Functional obstruction occurs due to interruption of normal peristaltic contraction waves.

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19
Q

What is esophageal stenosis and what are its pathological features?

A

Esophageal stenosis is thickening of the esophageal wall with narrowing of the lumen, characterized by fibrous thickening of the submucosa, atrophy of the muscularis propria, and secondary epithelial damage.

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20
Q

What are the causes and clinical presentation of esophageal stenosis?

A

It is usually caused by inflammation and scarring from chronic reflux, radiation, or caustic poisoning; rarely it is congenital. It usually occurs in adults and presents with progressive dysphagia.

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21
Q

What is an esophageal web and what are its key features?

A

An esophageal web is a semicircular protrusion of the mucosa into the lumen, usually located in the upper esophagus, commonly seen in women over 40, associated with gastroesophageal reflux, graft-versus-host disease, and some skin diseases; microscopically it contains fibrovascular connective tissue beneath the epithelium.

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22
Q

What is an esophageal ring (Schatzki ring) and how does it differ histologically?

A

A Schatzki ring is similar to a web but is thicker and circular; its mucosa includes submucosa and sometimes hypertrophic muscularis propria. When located above the distal gastroesophageal junction it is lined by squamous epithelium, and below it by cardia-type mucosa.

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23
Q

What is an esophageal diverticulum?

A

A: An esophageal diverticulum is a pouch-like outpouching of the esophageal wall.

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24
Q

What defines a true diverticulum versus a false diverticulum?

A

A: A true diverticulum involves all layers of the esophageal wall, whereas a false diverticulum includes only the mucosa and submucosa.

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25
How are esophageal diverticula classified based on etiopathogenesis?
They are classified into two types: pulsion diverticula and traction diverticula.
26
What is Zenker’s diverticulum and what is its mechanism?
Zenker’s diverticulum is a pharyngoesophageal diverticulum caused by a pulsion mechanism due to motor dysfunction proximal to the upper esophageal sphincter.
27
What is an epiphrenic diverticulum and where is it located?
A: Epiphrenic diverticulum is a pulsion diverticulum located above the lower esophageal sphincter and diaphragm.
28
What is a midesophageal diverticulum and how does it develop?
A: A midesophageal diverticulum is a traction diverticulum located in the middle to lower esophagus and occurs due to inflammatory events involving the lungs and mediastinal lymph nodes.
29
What are the morphological features of esophageal diverticula?
A: They are lined with squamous epithelium and may be accompanied by inflammation.
30
What is the typical clinical feature of esophageal diverticula?
Regurgitation without dysphagia.
31
What is achalasia and how is it classified?
A: Achalasia is a primary esophageal motility disorder with an often unknown cause, characterized by specific motor abnormalities.
32
What are the key pathophysiological features of achalasia?
Aperistalsis, incomplete relaxation of the lower esophageal sphincter (LES), and increased resting tone of the LES.
33
What are the secondary causes of achalasia?
Secondary achalasia can result from Chagas disease (Trypanosoma cruzi), diseases of the vagal dorsal motor nucleus (such as polio or surgical ablation), diabetic autonomic neuropathy, and infiltrative diseases including malignancy, amyloidosis, and sarcoidosis.
34
What are the main morphological features of achalasia?
Achalasia shows progressive esophageal dilatation, muscular hypertrophy above the lower esophageal sphincter (LES), and secondary mucosal injury.
35
What neural changes are seen in achalasia?
A: There is an absence of myenteric ganglion cells in the lower one-third of the esophagus, along with inflammation of the myenteric nerves and collagenization.
36
What are the main clinical features of achalasia?
Dysphagia, regurgitation, and aspiration are common clinical features.
37
What is the cancer risk associated with achalasia?
A: Achalasia carries about a 5% risk of developing esophageal squamous cell carcinoma (SCC).
38
What are the major types of esophagitis?
A: Esophagitis includes lacerations, esophageal varices, chemical and infectious esophagitis, reflux esophagitis, and eosinophilic esophagitis.
39
What are Mallory–Weiss tears?
They are longitudinal lacerations of the esophagus near the gastroesophageal junction.
40
In which patients do Mallory–Weiss tears typically occur and why?
A: They commonly occur in alcoholics due to reflux of gastric contents during severe belching and vomiting.
41
What pathological findings and clinical significance are associated with Mallory–Weiss tears?
A: Fresh bleeding and nonspecific inflammation are seen, and they account for 5–10% of upper gastrointestinal bleeding.
42
How do esophageal varices develop?
They develop due to portal hypertension, leading to congestion and dilation of the subepithelial and submucosal venous plexuses of the distal esophagus.
43
What conditions are commonly associated with esophageal varices and what complications may occur?
They occur in about 90% of patients with cirrhosis and also in hepatic schistosomiasis; varices may rupture, causing hemorrhage into the esophageal wall and lumen.
44
What does the morphology of esophageal varices show?
Tortuous and dilated varices beneath intact squamous mucosa, with polypoid areas representing previous sites of variceal hemorrhage that have been ligated.
45
What are the causes of chemical and infectious esophagitis and related conditions?
Causes include alcohol, corrosive agents, hot drinks, cigarettes, medications, chemotherapy, radiotherapy, and infections such as CMV, fungi, and herpes; esophageal involvement may also occur in desquamative skin diseases like bullous pemphigoid, epidermolysis bullosa, and Crohn’s disease.
46
How does the morphology of esophagitis vary?
A: The morphology of esophagitis varies according to its etiology.
47
What is a common inflammatory feature seen in many forms of esophagitis?
A: Intense neutrophil infiltration is commonly seen.
48
What morphological changes are seen in chemical esophagitis?
A: Chemical esophagitis is characterized by necrosis and/or ulcer formation.
49
What are the characteristic morphological findings in fungal (Candida) esophagitis?
Findings include pseudomembranes, ulcerations, inflammation, fungal hyphae and spores on the surface, severe inflammation, superficial necrosis, granulation tissue, and fibrosis.
50
What are the typical ulcer features of herpes esophagitis?
Herpes esophagitis shows “staple-hole” ulcers with nuclear viral inclusions in epithelial cells at the edge of the ulcer and multinucleated squamous cells.
51
What are the characteristic findings of cytomegalovirus (CMV) esophagitis?
A: CMV esophagitis presents with shallow ulcers and nuclear and cytoplasmic inclusions in endothelial and stromal cells.
52
Which infectious agent is the best known cause of infectious esophagitis?
A: Candida is the best known infectious agent causing esophagitis.
53
What are the histologic features of eosinophilic esophagitis?
A: It is characterized by intense intraepithelial eosinophil infiltration.
54
What are the clinical features of eosinophilic esophagitis?
Resistance to proton pump inhibitors, absence of acid reflux, and occurrence in atopic individuals.
55
How is eosinophilic esophagitis treated?
Treatment includes avoidance of allergens and the use of steroids.
56
What are the main causes and contributing factors of reflux esophagitis?
Causes include decreased lower esophageal sphincter (LES) tone due to CNS depressants, hypothyroidism, pregnancy, nasogastric tube use, obesity, and alcohol; disruption of antireflux mechanisms; sliding hernia; slowing of esophageal antireflux mechanisms; and delayed gastric emptying with increased stomach volume.
57
What are the macroscopic morphological findings in reflux esophagitis?
Macroscopically, reflux esophagitis shows simple hyperemia.
58
What is the most common cause of esophagitis?
Reflux esophagitis (GERD) is the most common cause.
59
What are the histopathological features of reflux esophagitis?
A: Features include epithelial hyperplasia, basal cell hyperplasia exceeding 20% of epithelial thickness, congestion of papillae in the lamina propria with extension into the upper one-third of the epithelium, balloon degeneration of squamous cells, intraepithelial eosinophils, lymphocytes and polymorphonuclear leukocytes (PMNLs), and inflammation of the cardiac mucosa.
60
What are the main complications of reflux esophagitis?
Reflux esophagitis can lead to ulceration, bleeding (manifesting as hematemesis or melena), stricture formation, and Barrett esophagus.
61
What is Barrett esophagus and what causes it?
Barrett esophagus occurs as a result of prolonged gastroesophageal reflux and is characterized by intestinal metaplasia in the esophageal mucosa that is normally lined by squamous epithelium.
62
What epithelial change defines Barrett esophagus?
In Barrett esophagus, the normal squamous epithelium of the esophagus is replaced by metaplastic columnar epithelium with intestinal-type features.
63
Where does Barrett esophagus typically develop anatomically?
Barrett esophagus develops 2–3 cm above the distal esophagus at the gastroesophageal junction.
64
What endoscopic and histopathologic finding is essential for diagnosing Barrett esophagus?
The presence of goblet cells, indicating intestinal metaplasia, is essential for diagnosis on endoscopic biopsy and histopathology.
65
What is the proposed pathogenesis of Barrett esophagus?
It involves the development of stem cells following inflammation and ulceration, with differentiation into columnar epithelium that is resistant to acid-peptic injury.
66
What are the gross (macroscopic) morphological features of Barrett esophagus?
Macroscopically, a red, velvet-like mucosa is seen between the pale esophageal squamous mucosa and the pink-brown gastric mucosa.
67
What are the histopathologic features of Barrett esophagus?
Histopathology shows replacement of squamous epithelium by metaplastic columnar epithelium, the need to investigate for dysplasia, and recognition that Barrett esophagus is a precursor of malignancy.
68
What histologic transition is seen at the gastroesophageal junction in Barrett esophagus?
There is a transition from esophageal squamous mucosa to Barrett metaplasia with abundant metaplastic goblet cells, sometimes with small islands of residual squamous mucosa.
69
What types of dysplasia can occur in Barrett esophagus?
Barrett esophagus can show low-grade dysplasia or high-grade dysplasia; if a clear decision cannot be made, the dysplasia is labeled as suspicious.
70
What complications can arise specifically from Barrett esophagus?
Complications include ulcers, strictures, hemorrhages, and the development of adenocarcinoma arising in Barrett mucosa.
71
What is the prognosis associated with Barrett esophagus?
The prognosis is poor, particularly due to its role as a precursor lesion for adenocarcinoma.
72
What are the benign tumors of the esophagus?
Benign esophageal tumors include leiomyoma, fibroma, lipoma, hemangioma, neurofibroma, squamous papilloma, and adenoma.
73
What malignant tumors can occur in the esophagus?
Malignant esophageal tumors include squamous cell carcinoma, adenocarcinoma, undifferentiated carcinoma, malignant melanoma, carcinoid tumor, lymphoma, sarcoma, and metastatic tumors.
74
What are the age and sex distribution characteristics of esophageal squamous cell carcinoma?
Squamous cell carcinoma is common after the age of 45 and occurs more frequently in men, with a male-to-female ratio of 4:1.
75
How does the incidence of esophageal squamous cell carcinoma vary geographically?
The incidence varies widely between countries and is particularly common in Iran, Brazil, China, South Africa, Hong Kong, Eastern Europe, and Kenya.
76
Why is esophageal squamous cell carcinoma seen at a younger age in Kenya?
In Kenya, it can occur before the age of 30 due to consumption of traditional fermented milk called mursik, which contains acetaldehyde, a known carcinogen.
77
Which racial group has a higher risk of developing squamous cell carcinoma of the esophagus?
The risk of esophageal squamous cell carcinoma is higher in Black populations.
78
What dietary and environmental factors contribute to the etiology of squamous cell carcinoma?
Dietary and environmental factors include consumption of very hot drinks, alcohol use, tobacco exposure, and nitroso compounds in tobacco and diet.
79
How do alcohol, tobacco, and nitroso compounds contribute to carcinogenesis?
Nitroso compounds in tobacco and diet cause mutations in the p53 tumor suppressor gene, promoting carcinogenesis.
80
What medical conditions and exposures increase the risk of squamous cell carcinoma of the esophagus?
Risk factors include chronic esophagitis, long-term exposure to carcinogens, achalasia, Plummer–Vinson syndrome, tylosis, corrosive injuries, poverty, and HPV infection in high-risk areas.
81
What are the key molecular events in the pathogenesis of squamous cell carcinoma?
Molecular changes include amplification of the transcription factor gene SOX2, overexpression of cyclin D1 involved in cell cycle regulation, and mutations in tumor suppressor genes such as TP53, E-cadherin, and NOTCH1.
82
Where is squamous cell carcinoma most commonly located within the esophagus?
Approximately 20% occur in the upper esophagus, 50% in the middle esophagus, and 30% in the lower esophagus.
83
What are the gross morphological types of squamous cell carcinoma?
There are three morphological types: polypoid (60%), flat-diffuse infiltrative (15%), and ulcerative (25%).
84
What immunohistochemical and molecular findings are associated with squamous cell carcinoma?
Tumor cells are cytokeratin positive on immunohistochemistry, with common findings of p53 mutation and loss of p16 expressio
85
How does squamous cell carcinoma spread within the esophagus and to lymph nodes?
A rich submucosal lymphatic network facilitates longitudinal and circumferential spread, with intramural tumor nodules occurring a few centimeters from the main mass. Lymph node metastasis depends on tumor location and can involve cervical, mediastinal, paratracheal, tracheobronchial, gastric, and celiac lymph nodes.
86
What are the clinical features and survival rates of squamous cell carcinoma?
Patients develop progressive dysphagia, initially for solids and later for liquids. Prognosis is poor in advanced disease, with less than 5% 5-year survival. If confined to the esophagus, 5-year survival is 40–50%, and with detection by endoscopic screening, 5-year survival increases to about 75%.
86
. What factors are most important in determining the prognosis of squamous cell carcinoma?
The pathological stage is the most important prognostic factor, with tumor depth of invasion, lymph node metastasis, histological grade, tumor growth pattern, vascular invasion, and host response all influencing outcome.
87
What are the recognized variants of esophageal squamous cell carcinoma?
The variants of squamous cell carcinoma include spindle cell carcinoma, basaloid carcinoma, and verrucous carcinoma.
88
What molecular and genetic alterations are associated with adenocarcinoma arising in Barrett esophagus?
These include p53 overexpression or mutation in metaplastic epithelium, allelic loss of CDKN2A (p16/INK4a), amplification of cyclin D1, MET, c-erbB-2, EGFR, and cyclin E, as well as mutations in the Rb gene.
88
On what background does esophageal adenocarcinoma most commonly develop?
Esophageal adenocarcinoma most commonly develops on Barrett mucosa.
89
How does chronic gastroesophageal reflux contribute to the development of esophageal adenocarcinoma?
Chronic reflux causes ongoing cell damage that induces DNA damage, leading to impaired cell cycle control and progression to adenocarcinoma.
90
What are the histopathological features of esophageal adenocarcinoma?
Histopathologically, it is an adenocarcinoma that produces mucin and is composed of malignant gland-forming cells
90
Where is esophageal adenocarcinoma usually located anatomically?
It is usually located in the lower (distal) esophagus and often involves the gastroesophageal junction or gastric cardia.
91
What are the possible alternative origins of esophageal adenocarcinoma besides Barrett esophagus?
Rarely, it may arise from heterotopic gastric mucosa, originate from ducts and glands located in the submucosa, or develop from the gastroesophageal junction, making discrimination of origin difficult.
92
How does the prognosis and gross comparison of adenocarcinoma differ from squamous cell carcinoma?
The prognosis of esophageal adenocarcinoma is similar to that of squamous cell carcinoma. Adenocarcinoma typically occurs distally and may involve the gastric cardia, while squamous cell carcinoma is most often found in the mid-esophagus and commonly causes strictures, with distinct histologic patterns for each.
304 Pathology
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