case_images: PMC10864147_01
case_images: A pathologically confirmed respiratory epithelial adenomatoid hamartoma in a 22-year-old male.. A, B. Preoperative axial (A) and coronal reformatted (B) CT scans show a well-defined lobulating cystic lesion in the left retromaxillary fat pad and pterygopalatine fossa (arrows in A, B). The adjacent bone shows remodeling without any erosive change (arrowhead in A). The left pterygopalatine fossa is widened by the cystic lesion (arrows in B).. C, D. Preoperative axial MRI scans show a well-demarcated lobulating mass in the left buccal space (retromaxillary fat pad). The mass demonstrates homogeneously high signal intensity in the fat-suppressed T2-weighted image (arrows in C, left) and subtle enhancement in the peripheral portion of the mass in the fat-suppressed contrast-enhanced T1-weighted image (arrows in C, right). The mass shows no diffusion restriction in the diffusion-weighted image (arrows in D).. E. Postoperative axial fat-suppressed contrast-enhanced T1-weighted MRI scan obtained 1.5 years postoperatively shows no evidence of tumor recurrence.. F. Photomicrograph of a REAH shows small to medium glandular proliferation (arrows) arising in direct continuity with the surface epithelium (black arrowheads) and invagination downward into the submucosa (white arrowhead). Scattered inflammatory cells (yellow arrows) are seen in the stroma (hematoxylin and eosin stain, x 200).. REAH = respiratory epithelial adenomatoid hamartoma
case_images: jksr-85-247-g001.jpg
case_images: PMC10864147_01_jksr-85-247-g001.jpg
case_images: F1
case_images: Intracranial extension of the lesion was not evident on CT or MRI (Fig. 1). The cystic mass was microscopically composed of respiratory epithelium with small to medium glandular proliferation and mature smooth muscle bundles (Fig. 1), consistent with REAH.