Unroofed coronary sinus (URCS) is a rare heart birth defect where part or all of the thin wall (the “roof”) that normally separates the coronary sinus (the ...

Atrial Septal Defect, coronary sinus type (also called unroofed coronary sinus) it’s a rare heart birth defect where the coronary sinus (a small venous channel ...

ASD-AV conduction defects syndrome is a rare, inherited heart condition. A person has a hole between the heart’s upper chambers (an atrial septal defect, most ...

Atrial septal defect (ASD) means there is a hole in the wall (the septum) that separates the two top chambers of the heart (the right and left atria). Because ...

Atrioventricular conduction defects are problems with the heart’s “electrical wiring” between the upper chambers (atria) and lower chambers (ventricles). ...

Atrial Septal Defect (ASD) is a birth defect where there is a hole in the wall (septum) that separates the heart’s two upper chambers (the atria). Because of ...

Atrial conduction disease means the electrical signal travels too slowly or gets blocked as it moves across the heart’s top chambers (the right and left ...

Urethral atresia means the urethra (the tube that lets urine exit the bladder) did not form a usable opening during fetal development. Urine cannot leave the ...

Atresia of the urethra means the urethra—the tube that should carry urine from the bladder to the outside—did not form an open channel. It is blocked ...

Jejunoileal atresia is a birth defect where a segment of the small intestine (jejunum and/or ileum) fails to form a normal, open tube, causing a complete ...

Jejunal atresia is a birth problem where a section of the middle small intestine (the jejunum) is blocked or missing. Because the tube is closed, milk cannot ...

Congenital small intestine atresia means a baby is born with a blocked or missing segment of the small bowel (jejunum or ileum). Food and fluid cannot pass ...

Apple-peel syndrome is a rare birth condition where a baby’s small intestine is blocked and twisted in a spiral, much like the peel of an apple. Doctors also ...

Atresia of the small intestine means a portion of a baby’s small bowel did not form a normal, open tube before birth. Instead of a smooth passage, there is a ...

Congenital hypotransferrinemia is an ultra-rare inherited condition where the blood has very little or almost no transferrin, the protein that normally carries ...

Atransferrinemia (also called congenital hypotransferrinemia) is a very rare inherited blood disorder where the body makes little or no transferrin, the main ...

Atkin–Flaitz–Patil–Smith syndrome is an extremely rare, X-linked syndromic intellectual disability described in a single extended family in the medical ...

Atkin-Flaitz syndrome (also reported as Atkin–Flaitz–Patil–Smith syndrome; sometimes listed as Atkin syndrome) is a rare X-linked genetic condition. It mainly ...

Athyreosis means a baby is born without any thyroid gland at all. Because the thyroid gland makes thyroid hormone, babies with athyreosis have primary ...

Feigenbaum–Bergeron–Richardson syndrome is an ultra-rare genetic disorder reported in the medical literature in 1994 in two brothers. It combines premature, ...