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Pathoma: Fundamentals of Pathology (2018)
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Colon

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Pathoma: Fundamentals of Pathology (2018) | Medicine (MD/DO) School Study Aid

Colon
18 Picmonics to Learn | 38 mins
Hirschsprung Disease
Failure of Neural Crest Cell Migration
Involves Rectum
Lack of Auerbach and Meissner Plexus
Chronic Constipation
Failure to Pass Meconium
Congenital Megacolon
Increased Risk with Down Syndrome
RET Mutations
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2 mins
Diverticulosis and Diverticulitis Assessment
Diverticulosis
Outpouching
Diverticulitis
Inflamed Diverticula
Assessment
Abdominal Pain
Abdominal Distention
Flatulence
Fever
Rectal Bleeding
Alternating Constipation and Diarrhea
Considerations
Peritonitis
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2 mins
Diverticulosis and Diverticulitis Interventions
Interventions
High Fiber Diet
Reduce Intra-abdominal Pressure
Stool Softeners
Exercise
Anticholinergics
Considerations
Antibiotics
Bowel Resection
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2 mins
Mesenteric Ischemia
Signs and Symptoms
Severe Abdominal Pain
Bloody Diarrhea
Metabolic Acidosis
Diagnosis
Increased WBC
Increased Lactate (Lactic Acid)
X-ray
Air Within Bowel Wall
CT Angiography
Bowel Wall Edema
Treatment
Antibiotics
Emergent Surgical Intervention
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2 mins
Irritable Bowel Syndrome (IBS) Assessment
Abdominal Pain
Relieved by Defecation
Alternating Diarrhea and Constipation
Fatigue
Excessive Flatulence
Sensation of Incomplete Evacuation
Considerations
Stressors
Food Intolerances
More Common in Women
Rule Out Other Disorders
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2 mins
Irritable Bowel Syndrome (IBS) Interventions
Interventions
Identify Triggers
Increase Fiber Intake
Probiotics
Anticholinergics
Tricyclic Antidepressants (TCAs)
Loperamide
Linaclotide
Medications for Women
Tegaserod (Zelnorm)
Lubiprostone (Amitiza)
Alosetron (Lotronex)
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2 mins
Turcot Syndrome
Pathophysiology
Autosomal Dominant or Autosomal Recessive
Colonic Polyposis + CNS Tumor
Associations
Increased Risk of Colorectal Cancer
Increased Risk of Brain Cancer
Lynch Syndrome
Glioblastoma Multiforme
Familial Adenomatous Polyposis (FAP)
Medulloblastoma
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2 mins
Gardner Syndrome
Pathophysiology
Familial Adenomatous Polyposis (FAP) + Extraintestinal Benign Tumors
Autosomal Dominant
APC Gene Mutation
Clinical Findings
Desmoid Tumors
Nasal Angiofibromas
Osteomas
Congenital Hypertrophy of Retinal Pigment Epithelium
Dental Abnormalities
Cutaneous Lesions
Adrenal Adenomas
Associations
Thyroid Cancer
Duodenal / Periampullary Cancer
Pancreatic Cancer
Hepatoblastoma
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2 mins
Peutz-Jeghers Syndrome
Mechanism and Characteristics
Symptomatic Age: 10-30 Years
LKB1/STK11 Gene Mutation
Autosomal Dominant
Signs and Symptoms
Benign GI Hamartomatous Polyps
Mucocutaneous Hyperpigmentation
Positive Family History
Increased Risk of Colorectal Carcinoma
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1 min
Colorectal Cancer Assessment
3rd Most Common Cancer
Assessment
Change in Bowel Habits
Bowel Obstruction
Rectal Bleeding
Anemia
Weight Loss
Ascites
Considerations
Colonoscopy
FOBT and FIT
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2 mins
Colorectal Cancer Interventions
Interventions
Surgical Colon Resection
Radiation
Chemotherapy
Considerations
Bowel Cleansing
Screening
Colostomy
Dietary Consult
Body Image
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3 mins
Lynch Syndrome (Hereditary Nonpolyposis Colorectal Cancer)
Characteristics
Autosomal Dominant
Defective DNA Mismatch Repair
80% Risk of Colon Cancer Development
Proximal (Right) Colon
Type II associated with Endometrial, Ovarian and Skin Cancers
3-2-1 Rule
3 Relatives with Colon Cancer
Occurs Across 2 Generations
1 Relative Diagnosed < 50 Years Old
Treatment
Frequent Screening
Colectomy
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3 mins
Volvulus Characteristics and Presentation
Characteristics
Bowel Torsion
Bowel Infarction
Sigmoid Colon and Cecum
Clinical Features
Small Bowel Obstruction
Abdominal Pain
Unstable Vital Signs
Peritonitis
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2 mins
Volvulus Diagnosis and Management
Diagnosis
Abdominal X-ray
Coffee Bean Sign
Kidney Bean Sign
Abdominal CT Scan
Whirl Sign
Barium Enema
Bird's Beak Sign
Management
Fluid Resuscitation
Surgery
Consider Antibiotics
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3 mins
Familial Adenomatous Polyposis
Pathophysiology
Autosomal Dominant
Mutation in Chromosome 5
APC Gene Mutation
Overexpression of Beta-catenin
Two-Hit Hypothesis
Clinical Findings
Change in Bowel Habits
Colonic Polyps
Screening
Colonoscopy
Management
Prophylactic Surgery
Considerations
Progresses to Colorectal Carcinoma
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3 mins
Juvenile Polyposis Syndrome
Characteristics
Autosomal Dominant
Children < 5 Years Old
Clinical Findings
Hamartomatous Polyps in Gastrointestinal Tract
GI Distress
Anemia
Considerations
Increased Risk of Colorectal Carcinoma
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2 mins
Non-neoplastic Colonic Polyps
Characteristic
Benign
Types
Hyperplastic Polyps
Rectosigmoid
Hamartomatous Polyps
Peutz-Jeghers Syndrome
Juvenile Polyposis Syndrome
Inflammatory Pseudopolyps
Inflammatory Bowel Disease
Mucosal Polyps
Submucosal Polyps
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2 mins
Neoplastic Colonic Polyps
Characteristic
Malignant
Types
Adenomatous Polyps
APC and KRAS Mutation
Villous Type is more Malignant
Serrated Polyps
BRAF Mutation
Saw-Tooth Pattern
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2 mins

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