LearningRadiology - Hamartoma

Hamartomas of the Lung

• Hamartoma is composed of tissues normally found at this location but in abnormal quantity, mixture or arrangement

INCIDENCE

• 0.25% in population

• 8% of all solitary pulmonary nodules

• Most common benign lung tumor

• 5th and 6th decade peak

• Male to female ratio of 3:1

CLINICAL

• Mostly asymptomatic

• Cough

• Fever (with postobstructive pneumonia)

• Hemoptysis (rare)

LOCATION

• 2/3 are peripheral

• Endobronchial in 10%

• Rarely multiple

X-ray

• Round, smooth mass_—increase in size slowly

• Calcification in 15% — pathognomonic if popcorn type

• Fat in 50% —detected by CT

• Cavitation extremely rare

DDX

• Other causes of a solitary pulmonary nodule

• Bronchial adenoma

• Bronchogenic ca

• Granuloma

• Lipoid pneumonia (both contain fat)

WH/92