congenital absence of left circumflex artery is a rare congenital anomaly of the coronary arteries. the prevalence of the anomaly in different studies ranges from 0.6% to 1.3%. of these, 80% are benign and asymptomatic and 20% are clinically important. we report a 56-year-old man presented with acute resting chest pain who was diagnosed as having acute anterolateral infarction accompanied by el...

a case of an acute intestinal obstruction in a 64 -year - old man, due to cicatriceal stricture of tlie left colon with secondary enteroliths in colon, is presented. enteroliths in colon arc rare and it is suggested that stasis is the most important factor in their production as ihey arc. most commonly associated with an intestinal sricturc.

Let $Q$ be an inverse semigroup. A subsemigroup $S$ of $Q$ is a left I-order in $Q$ and $Q$ is a semigroup of left I-quotients of $S$ if every element $qin Q$ can be written as $q=a^{-1}b$ for some $a,bin S$. If we insist on $a$ and $b$ being $er$-related in $Q$, then we say that $S$ is straight in $Q$. We characterize semigroups which are left I-quotients of left regular bands of right cancell...