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Applications of the Ideal Gas Law: Molar Mass, Density, and Volume03:43

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The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT,  suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.
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Case 273.

Hector N Aguilar1, Florin Manolea1, Vimal H Patel1

  • 1From the Department of Radiology and Diagnostic Imaging, University of Alberta Hospital, 2A2.41 WMC, 8440-112 St, Edmonton, AB, Canada T6G 2B7.

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This case study highlights a 55-year-old man with chronic pancreatitis who presented with acute abdominal pain. Imaging revealed findings consistent with his condition, emphasizing the role of MRI and CT in diagnosis.

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Area of Science:

  • Radiology
  • Gastroenterology
  • Internal Medicine

Background:

  • A 55-year-old man with a history of chronic pancreatitis due to alcohol abuse presented with acute abdominal pain, weakness, weight loss, and fever.
  • Clinical examination revealed upper abdominal tenderness. Laboratory tests showed elevated alkaline phosphatase, lipase, and C-reactive protein levels.

Purpose of the Study:

  • To investigate the cause of acute symptoms in a patient with a history of chronic pancreatitis.
  • To assess the pancreas using advanced imaging techniques.

Main Methods:

  • The patient underwent urgent computed tomography (CT) for acute symptoms.
  • Magnetic resonance imaging (MRI) of the abdomen was performed, including T2-weighted and T1-weighted sequences with gadolinium contrast administration.
  • Previous MRI images from two months prior were used for comparison.

Main Results:

  • CT revealed acute symptoms.
  • MRI demonstrated findings related to chronic pancreatitis and assessed the pancreas.
  • Comparison with prior MRI aided in evaluating changes over time.

Conclusions:

  • Imaging modalities like CT and MRI are crucial for diagnosing and monitoring patients with chronic pancreatitis and acute abdominal symptoms.
  • The case underscores the importance of a comprehensive diagnostic approach combining clinical, laboratory, and imaging data.