Chronic Venous Congestion (CVC) - Gross & Microscopic Features

CVC results from impaired venous drainage, most commonly due to right-sided heart failure (for liver and spleen) or left-sided heart failure (for lungs). Each organ shows characteristic gross and microscopic changes.

1. CVC - SPLEEN (Congestive Splenomegaly)

Gross Features

• Enlarged and tense spleen - weight may reach up to 500 g or more (normal ~150 g)
• Firm consistency due to fibrous thickening
• Capsule is tense and may show perisplenitis
• Cut surface is dark red with a beefy, congested appearance
• In long-standing cases, the cut surface shows small, rust-brown nodules called Gamna-Gandy bodies (siderotic nodules / "tobacco flecks") - these are foci of old hemorrhage with hemosiderin and calcium deposits
• Trabeculae and follicles may be obscured

Microscopic Features

• Dilated and engorged sinusoids filled with red blood cells
• Follicular atrophy - Malpighian corpuscles (white pulp) become compressed and reduced in size
• Congestion of the red pulp with marked sinusoidal dilation
• Fibrosis of sinusoidal walls (thickening of the sinusoidal lining) in long-standing cases
• Gamna-Gandy bodies microscopically: foci of hemosiderin deposits, calcium salts, and fibrous tissue surrounded by iron-encrusted connective tissue fibers (Perls' Prussian blue stain positive)
• Hemosiderin-laden macrophages in the red pulp
• In severe portal hypertension: platelet sequestration leading to thrombocytopenia clinically

2. CVC - LUNG (Chronic Pulmonary Congestion)

Cause

Gross Features

• Lungs are heavy, firm, and boggy (increased weight - normally ~300-400 g, may become 700-1000 g)
• Red-brown discoloration - due to hemosiderin deposition and fibrosis ("brown induration")
• Cut surface oozes frothy, blood-tinged fluid
• Interlobular septa are thickened and visible
• Rubbery and non-crepitant texture (unlike normal spongy, crepitant lung)
• Pleural effusions (serous transudates) are commonly associated

Microscopic Features

• Acute phase:
  • Engorged and dilated alveolar capillaries
  • Alveolar septal edema
  • Intra-alveolar hemorrhage (red cells in alveoli)
  • Finely granular pale pink intra-alveolar transudate
• Chronic phase (the hallmark findings):
  • Alveolar septa are thickened and fibrotic (septal fibrosis)
  • Heart failure cells (siderophages) - alveolar macrophages laden with hemosiderin, derived from phagocytosis of extravasated red blood cells; stain positively with Perls' Prussian blue stain
  • Abundant heart failure cells are the hallmark of chronic pulmonary congestion
  • Capillary dilation with thickening of alveolar walls
  • Hemosiderin deposits both intra- and extra-cellular

3. CVC - LIVER (Nutmeg Liver / Congestive Hepatopathy)

Cause

Gross Features

• Enlarged, heavy liver (congestive hepatomegaly) with rounded edges
• Tense capsule - cyanotic (blue-red) appearance on the surface
• Classic "nutmeg liver" on cut section:
  • Red-brown centrilobular areas (congested and hemorrhagic) alternating with
  • Pale yellow/tan periportal areas (fatty change or normal parenchyma)
  • This mottled variegated appearance resembles the cut surface of a nutmeg
• Liver is soft in early stages; becomes firmer with progression
• In severe cases: cardiac cirrhosis with nodularity (rare but end-stage finding)

Microscopic Features

• Centrilobular (zone 3) sinusoidal congestion - sinusoids dilated and packed with red blood cells
• Centrilobular hepatocyte atrophy - hepatocytes compressed by congested sinusoids, resulting in markedly attenuated liver cell plates
• Periportal hepatocytes (zone 1) are relatively spared - may show fatty change (lipid accumulation) due to hypoxia
• When left-sided failure + hypoperfusion is also present:
  • Centrilobular coagulative necrosis (ischemic hepatocyte death) superimposed on congestion
  • The combination of retrograde congestion + hypoperfusion = centrilobular hemorrhagic necrosis
• Sharp demarcation between viable periportal parenchyma and necrotic/atrophic centrilobular regions suffused with blood
• In long-standing severe CHF:
  • Centrilobular fibrosis (cardiac sclerosis) - fibrous tissue deposited around central veins
  • Progression to cardiac cirrhosis (uncommonly) - fibrous septa extending from central vein to central vein (central-to-central bridging fibrosis, unlike portal-to-portal in usual cirrhosis)

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