UWorld UWorld System-Based Pathology

Question 1

In UWorld cardiology content, what ECG finding is most associated with Wolff-Parkinson-White (WPW) syndrome?

Accepted Answer

Short PR interval with a delta wave (slurred upstroke of the QRS)

Answer

WPW features a short PR interval due to accessory pathway conduction and a delta wave from ventricular pre-excitation, both hallmarks tested extensively in UWorld cardiology questions.

Question 2

Which pulmonary condition in UWorld is classically associated with the radiographic finding of 'honeycomb lung' on CT?

Accepted Answer

Idiopathic pulmonary fibrosis (IPF)

Answer

Honeycombing on CT with a subpleural, basal-predominant pattern is the hallmark of IPF, representing end-stage fibrosis with cystic airspace formation.

Question 3

In UWorld nephrology, what is the classic urinalysis finding in acute tubular necrosis (ATN)?

Accepted Answer

Muddy brown granular casts

Answer

Muddy brown granular casts in the urine are pathognomonic for ATN, resulting from sloughed tubular epithelial cells in the setting of ischemic or nephrotoxic injury.

Question 4

What UWorld hematology concept explains why sickle cell patients are functionally asplenic?

Accepted Answer

Repeated splenic infarctions from sickling cause autosplenectomy, leaving patients susceptible to encapsulated organisms

Answer

Repeated vaso-occlusive episodes in the spleen cause progressive infarction and fibrosis (autosplenectomy), rendering patients susceptible to infections with encapsulated bacteria like Streptococcus pneumoniae.

Question 5

In UWorld endocrinology, what distinguishes Cushing's disease from ectopic ACTH syndrome?

Accepted Answer

Cushing's disease is caused by a pituitary adenoma secreting ACTH, while ectopic ACTH is secreted by non-pituitary tumors like small cell lung cancer

Answer

Cushing's disease specifically refers to pituitary ACTH overproduction, while ectopic ACTH comes from tumors like small cell lung carcinoma; both cause bilateral adrenal hyperplasia, but the source differs.

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UWorld UWorld System-Based Pathology