Lobar Atelectasis: Diagnostic Pitfalls on Chest
RadiographyPresented by : dr.Ikhwanul hakim NstLectured by :
dr.Netty D Lubis, SpRad (K).
Introduction HoweverClassification of Unusual Manifestations of
Lobar AtelectasisGroup 1: atelectasis with marked volume lossMost
case of atelectasis in this group are caused by peripheral airway
obstructionThe lobe in this group is small and may be overlooked on
plain chest radiographHowever, many anatomical alterations as
indirect sign of lobar atelectasis can be identified (figure
1-6)
Group 2: Atelectasis presenting as a mass-like opacityLobar
atelectasis sometimes presents as a mass-like opacity with a sharp
lateral margin on the chest radiograph (fig 7-10), and may be
misdiagnosed as a mediastinal or lung tumorCT is useful in
differentiating atelectasis from mediastinal or lung tumor (fig
8-9)
Group 3: Atelectasis in an unusual locationThe lower lobe is
generally tethered to the mediastinum and the hemidiaphragm by the
inferior pulmonary ligamentIn contrast, the upper lobe and right
middle lobe are incompletely fixedThe atelectatic upper lobe and
right middle lobe often mobile, resulting in an unusual location
(fig 10-13)
