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Difficulty: HardInterpreting Imaging Results

Match the following detailed radiological descriptions of imaging findings to their most likely underlying clinical condition.

  • Macronodule surrounded by a perimeter of ground-glass opacity on high-resolution chest CTInvasive pulmonary aspergillosis
  • Simultaneous dilation of the common bile duct and the main pancreatic duct on magnetic resonance cholangiopancreatographyPancreatic head adenocarcinoma
  • Triangular area of contrast enhancement surrounding a central non-enhancing region in the superior sagittal sinus on brain CT venographyCerebral venous sinus thrombosis
  • Alternating segments of focal luminal stenosis and aneurysmal dilation in the mid-to-distal renal artery on magnetic resonance angiographyFibromuscular dysplasia
  • Smooth, symmetric tapering of the distal esophagus with significant proximal dilation on barium esophagramAchalasia

Answer

The descriptions correspond to pathognomonic signs for Invasive pulmonary aspergillosis, Pancreatic head adenocarcinoma, Cerebral venous sinus thrombosis, Fibromuscular dysplasia, and Achalasia, respectively.
Each specific radiological description translates to a well-known pathognomonic 'sign' that correlates directly with a single specific underlying pathophysiology. The 'halo sign' points to invasive pulmonary aspergillosis; the 'double duct sign' to pancreatic head adenocarcinoma; the 'empty delta sign' to cerebral venous sinus thrombosis; the 'string of beads' to fibromuscular dysplasia; and the 'bird's beak' to achalasia.

Step-by-Step Solution

1
Analyze the chest CT finding of a macronodule with ground-glass opacity.
Identify the pattern as the 'halo sign'.
The ground-glass halo represents alveolar hemorrhage surrounding an invasive fungal infection, which is the pathognomonic finding of invasive pulmonary aspergillosis.
2
Evaluate the MRCP finding of dual ductal dilation.
Identify the pattern as the 'double duct sign'.
An obstructing mass at the pancreatic head causes upstream back-pressure, leading to simultaneous dilation of both the common bile duct and the main pancreatic duct, classically seen in pancreatic head adenocarcinoma.
3
Assess the CT venography finding of a non-enhancing center within a triangular enhancing region in the superior sagittal sinus.
Identify the pattern as the 'empty delta sign'.
The non-enhancing center is the occlusive thrombus, while the enhancing triangle is the collateral dural venous flow, confirming cerebral venous sinus thrombosis.
4
Examine the MR angiography finding of alternating stenosis and dilation in the renal artery.
Identify the pattern as the 'string of beads' sign.
This morphological change represents medial fibroplasia, the most common pathological variant of fibromuscular dysplasia.
5
Interpret the barium esophagram showing distal tapering and proximal dilation.
Identify the pattern as the 'bird's beak' sign.
This structural change results from incomplete lower esophageal sphincter relaxation and absent peristalsis, the hallmarks of achalasia.

Key Concept

Identifying classic pathognomonic imaging signs from their radiological descriptions and correlating them with their underlying clinical diagnoses.
Estimated Time:2m 0s
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Topics

Interpreting Imaging Results

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