Loop-shaped contrasts were observed in the as-grown Al70.3Pd2o.6Mn9. 1 icosahedral quasicrystal (IQC) by means of x-ray diffraction topography (Langs method). One possible direction of the apparent Burger vectors of loopshaped defects (LSDs) was determined to be B ＝ [110101] by the invisibility criterion, whose physical component is parallel to the two-fold axis 1/τ1/0, 1/1, 0/1 of the IQC. Apart from the relaxation of strain fields around the faceted dodecahedral holes and lamellar precipitates, LSDs may well originate from the growth of the quasicrystal, which shows that these defects could be a kind of intrinsic defect in the quasicrystals.