Safe
VS
Infected

Fatty Hepatosis vs Organ Necrosis

Master the critical difference between these two X-Ray organ symptoms

Last Updated: January 19, 2026

Critical Difference at a Glance

Understanding the difference between these symptoms is life-or-death. One is safe, one requires immediate action.

Aspect
Fatty Hepatosis
Organ Necrosis
ColorYellow splotchesBlack splotches
RatingGREEN (Safe)RED (Infected)
ActionSurvivors BlockLiquidation
CoverageScattered patchesAlmost full organ
UnlockLab requiredLab required

Fatty Hepatosis

Safe Symptom - Admit to Survivors Block

Fatty Hepatosis is caused by poor diet - the survivor is obese, not infected. The organ appears yellow and may look like it's rotting, but this doesn't indicate infection.

Danger Rating

GREEN (Safe)

Detection Tool

X-Ray Scanner

Unlock Status

Lab Required

Required Action

Survivors Block

Visual Appearance

  • Organ covered in yellow splotches
  • Yellow-ish shade on any organ
  • Scattered yellow patches (not full coverage)
  • Can appear on liver, lungs, brain, intestines
Pancreas Warning

The pancreas naturally appears yellow! It's tucked behind the intestines, near the lungs. Do NOT mistake a healthy pancreas for fatty hepatosis.

Organ Necrosis

Infected - Immediate Liquidation Required

Organ Necrosis indicates severe infection with tissue death. The organ shows dark black splotches covering most of its surface. This is a critical RED symptom.

Danger Rating

RED (Infected)

Detection Tool

X-Ray Scanner

Unlock Status

Lab Required

Required Action

Liquidation

Visual Appearance

  • Dark black splotches on organ
  • Almost fully covers the organ
  • Cool black with small sections of blood red
  • Can appear on liver, lungs, brain, intestines
Lab Unlock Bug

Sometimes Organ Necrosis needs to be unlocked twice in the lab. If the unlock screen shows nothing, try unlocking it again.

Visual Identification Guide

The key to distinguishing these symptoms is color. Here's what to look for.

Remember This Rule

Yellow = Safe (Fatty Hepatosis)

Black = Danger (Organ Necrosis)

Check All Layers

Both symptoms can appear on any organ. Use all X-Ray layers to examine liver, lungs, intestines, and brain.

Compare Organs

If unsure, compare the suspected organ with other organs on the same survivor. Look for distinct color differences.

Coverage Matters

Fatty hepatosis appears as scattered patches. Organ necrosis almost fully covers the organ with black.

Common Mistakes to Avoid

These are the most frequent errors players make when distinguishing between Fatty Hepatosis and Organ Necrosis.

Confusing yellow and black in poor lighting

Both colors can look similar when not zoomed in

Always zoom in (RMB) and take time to identify the exact color

Mistaking pancreas for fatty hepatosis

The pancreas is naturally yellow

Remember pancreas location: behind intestines, near lungs. It's always yellow.

Rushing the X-Ray examination

Time pressure leads to misidentification

Take a few extra seconds - wrong decision is worse than slow decision

Not checking all organs

A survivor can have both symptoms on different organs

Check ALL organs on all X-Ray layers before making your final decision

Confusing organ necrosis with skin necrosis

Both have 'necrosis' in the name

Organ necrosis = X-Ray symptom (internal). Skin necrosis = visible symptom (external).

Detection Best Practices

Identifying Fatty Hepatosis

  • Look for yellow-ish shade on organs
  • Patches are scattered, not fully covering
  • Check all X-Ray layers
  • Ignore the pancreas (naturally yellow)
  • Yellow = admit to Survivors Block

Identifying Organ Necrosis

  • Look for dark black splotches
  • Coverage is extensive (almost full organ)
  • Check brain on Layer 3
  • Black = immediate liquidation required
  • Double-check before making liquidation decision

General Tips

  • Survivors holding stomach likely have organ symptoms
  • Both symptoms require lab unlock to identify
  • Multiple symptoms can appear on different organs
  • Take time - accuracy over speed