Attenuated adenomatous polyposis coli” is the milder form of familial adenomatous polyposis (FAP). It happens when a person is born with a harmful change (a ...

Attenuated familial adenomatous polyposis (AFAP) is an inherited condition that causes a person to grow fewer colon and rectal polyps than the classic form of ...

Atypical Chediak–Higashi syndrome is the milder, later-onset end of a single disease caused by changes (pathogenic variants) in the LYST gene. In atypical CHS, ...

Attenuated Chédiak-Higashi syndrome (CHS) is a rare, inherited immune system and pigment disorder caused by harmful changes (mutations) in a gene called LYST. ...

Folliculitis ulerythematosa reticulata (FUR) is a rare skin condition in the same family as keratosis pilaris atrophicans (KPA). It mainly affects the cheeks. ...

Atrophoderma vermiculata is a rare skin condition that usually begins in childhood. It first shows up as tiny rough bumps centered on hair follicles, most ...

Atrophoderma of Pasini and Pierini (APP) is a rare skin condition where the middle layer of the skin (the dermis) becomes thinner in certain areas, creating ...

Atrophic lichen planus (ALP) is a rare form (variant) of lichen planus—a chronic, immune-mediated disease that can affect skin, mouth, scalp, nails, and ...

Houlston-Ironton-Temple (HIT) syndrome is an extremely rare pattern of birth differences. Babies are born with a serious heart wall problem called an ...

Atrioventricular defect–blepharophimosis–radial and anal defect syndrome (AVB-RAD) is an extremely rare, inherited condition in which a child is born with a ...

Atrial cardiomyopathy means the atria (the two upper heart chambers) are diseased. The atrial walls may be thick, stiff, stretched, scarred (fibrosis), ...

Atrichia with papular lesions (APL) is a very rare, inherited hair disorder. Babies are born with normal hair or some soft hair. During the first months of ...

A sinus venosus atrial septal defect (often shortened to sinus venosus ASD) is a birth defect in the wall that separates the heart’s two upper chambers (the ...

A sinus venosus atrial septal defect (SVASD) is a hole that is not in the true thin wall between the upper heart chambers (the inter-atrial “septal membrane”). ...

An ostium secundum atrial septal defect is a birth-present hole in the thin wall (septum) between the two upper heart chambers (the atria). In the womb, every ...

A primum atrial septal defect is a birth defect in the wall between the two top chambers of the heart (the atria). The hole sits very low in that wall, close ...

A partial atrioventricular canal defect (often shortened to partial AVSD) is a birth defect of the heart where there is a hole low in the wall between the two ...

An “incomplete atrioventricular canal defect with an isolated atrial component means there is a hole low in the wall between the top heart chambers (the ...

An atrioventricular septal defect (AVSD) is a birth heart condition where the wall between the top chambers (atria) and the bottom chambers (ventricles) does ...

An atrial septal defect (ASD) is a hole in the wall (septum) between the two top chambers of the heart (the atria). The ostium primum type is a special kind of ...