Inflammatory Myoglandular Colorectal Polyps: A Case Series of Nine Patients

Inflammatory myoglandular polyp is an uncommon benign colorectal polyp. We treated nine cases of histologically verified inflammatory myoglandular polyp. The polyps were identified as a pedunculated protrusion located in the distal part of the large intestine. On colonoscopy, eight polyps had a smooth, spherical, and hyperemic surface, accompanied by a patchy mucous exudate. Magnification endoscopy revealed a rugged surface composed of smooth nodules. These colonoscopic findings corresponded to hyperplastic glands with occasional cystic dilation and inflamed stroma with proliferation of smooth-muscle fibers. Inflammatory myoglandular polyp appears to be a distinctive clinical entity, with a unique appearance on colonoscopy.

References

• 1 Nakamura S, Kino I, Akagi T. Inflammatory myoglandular polyps of the colon and rectum: a clinicopathological study of 32 pedunculated polyps, distinct from other types of polyps.  Am J Surg Pathol. 1992;  16 772-779
• 2 Griffiths A P, Hopkinson J M, Dixon M F. Inflammatory myoglandular polyp causing ileo-ileal intussusception.  Histopathology. 1993;  23 596-598
• 3 Gomez N E, Del Rio M JV, Sarasa C JL, Melero C E. Myoglandular inflammatory polyp located in the distal end of the rectum.  Rev Esp Enferm Dig. 1994;  85 45-46
• 4 Nagata S, Sumioka M, Sato O. et al . Five cases of inflammatory myoglandular polyp.  Nippon Shokakibyo Gakkai Zasshi. 1998;  95 145-150
• 5 Bhardwaj K, Mohan H, Chopra R. et al . Inflammatory myoglandular polyp of rectum.  Indian J Gastroenterol. 1998;  17 63-64
• 6 Harada N, Chijiiwa Y, Yao T. et al . Inflammatory myoglandular polyp.  J Clin Gastroenterol. 1999;  29 104-105
• 7 Mizuno M, Matsumoto T, Iida M, Shimizu M. Magnifying colonoscopic features in non-neoplastic polyps of the colorectum.  Gastrointest Endosc. 1997;  46 537-541