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Zorluk: OrtaPathology and Biopsy Interpretation

An occupational therapist in her mid-forties establishes care for persistent, generalized itching that is particularly bothersome at night. She also reports progressive exhaustion over the past several months despite getting adequate sleep. Physical examination reveals excoriations on her upper and lower extremities, but there is no scleral icterus, hepatosplenomegaly, or rash. Laboratory studies show a markedly elevated alkaline phosphatase and gamma-glutamyl transferase, with a normal total bilirubin level and mildly elevated aminotransferases. While awaiting an autoantibody panel, a percutaneous liver biopsy is performed to evaluate the etiology of her cholestasis. Microscopic evaluation of the specimen demonstrates a dense portal tract inflammatory infiltrate consisting of lymphocytes and plasma cells that is actively invading and destroying small interlobular bile ducts. Focal, poorly formed non-caseating granulomas are also identified immediately adjacent to the damaged ducts. There is minimal interface hepatitis and no significant parenchymal fibrosis.

Based on the clinicopathologic findings, which of the following is the most accurate diagnosis?

  1. Primary biliary cholangitisCevap
  2. B
    Primary sclerosing cholangitis
  3. C
    Autoimmune hepatitis
  4. D
    Hepatic sarcoidosis
  5. E
    Chronic hepatitis C infection

Cevap

Primary biliary cholangitis
The diagnosis is primary biliary cholangitis. The clinical presentation of fatigue and severe pruritus without jaundice in a middle-aged woman, combined with a cholestatic laboratory profile (elevated alkaline phosphatase and GGT), is highly suspicious for this condition. The definitive diagnostic feature on liver biopsy is the 'florid duct lesion,' which consists of a dense lymphoplasmacytic infiltrate and poorly formed non-caseating granulomas that actively invade and destroy the small interlobular bile ducts. This histopathologic finding is pathognomonic and confirms the diagnosis even before anti-mitochondrial antibody testing results are available.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation and initial laboratory findings.
The patient has pruritus, fatigue, and an isolated elevation in alkaline phosphatase and gamma-glutamyl transferase (GGT), indicating a cholestatic pattern of liver injury.
Establishing the clinical syndrome narrows the differential diagnosis primarily to biliary tract diseases or drug-induced cholestasis.
2
Interpret the histopathologic findings from the liver biopsy.
The biopsy shows granulomatous destruction of small interlobular bile ducts by a lymphoplasmacytic infiltrate, known as the 'florid duct lesion'.
Identifying the specific pattern of tissue injury on biopsy is required to differentiate among the various causes of intrahepatic cholestasis.
3
Synthesize the clinical and pathologic data to formulate the final diagnosis.
The combination of a cholestatic clinical picture in a middle-aged woman with pathognomonic florid duct lesions confirms primary biliary cholangitis.
Matching the biopsy hallmark with the demographic and laboratory profile provides a definitive diagnosis even before autoantibody (anti-mitochondrial antibody) results are available.

Anahtar Kavram

The pathologic hallmark of primary biliary cholangitis is the 'florid duct lesion', which is characterized by a dense lymphoplasmacytic infiltrate and granulomatous destruction of the small interlobular bile ducts.
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Pathology and Biopsy Interpretation

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