A case of sigmoid colon perforation due to segmental absence of intestinal musculature (SAIM) accompanied by vascular Ehlers–Danlos syndrome: a case report oleh Kosuke Funaki, Tomonori Akagi, Hidefumi Shiroshita, Yusuke Itai, Kiminori Watanabe, Takashi Shuto, Yoshitake Ueda, Tsuyoshi Etoh, Shinji Miyamoto, Tsutomu Daa, Masafumi Inomata