Fanconi anemia differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

[Disease name] must be differentiated from other diseases that cause [clinical feature 1], [clinical feature 2], and [clinical feature 3], such as [differential dx1], [differential dx2], and [differential dx3].

OR

[Disease name] must be differentiated from [[differential dx1], [differential dx2], and [differential dx3].

Differentiating X from other Diseases

• [Disease name] must be differentiated from other diseases that cause [clinical feature 1], [clinical feature 2], and [clinical feature 3], such as [differential dx1], [differential dx2], and [differential dx3].
• [Disease name] must be differentiated from [differential dx1], [differential dx2], and [differential dx3].

• As [disease name] manifests in a variety of clinical forms, differentiation must be established in accordance with the particular subtype. [Subtype name 1] must be differentiated from other diseases that cause [clinical feature 1], such as [differential dx1] and [differential dx2]. In contrast, [subtype name 2] must be differentiated from other diseases that cause [clinical feature 2], such as [differential dx3] and [differential dx4].

Preferred Table

Diseases	Clinical manifestations						Para-clinical findings							Gold standard	Additional findings
	Symptoms			Physical examination
							Lab Findings			Imaging			Histopathology
	Symptom 1	Symptom 2	Symptom 3	Physical exam 1	Physical exam 2	Physical exam 3	Lab 1	Lab 2	Lab 3	Imaging 1	Imaging 2	Imaging 3
Fanconi Anemia				Skin – Generalized hyperpigmentation; hypopigmented areas; large freckles, café-au-lait spots	Short stature, delicate features, upper limbs absent or hypoplastic thumbs, supernumerary, bifid clinodactyly	Head – Microcephaly or hydrocephaly; birdlike face, mid-face hypoplasia, Sprengel's deformity of neck, Eyes- Microphthalmia, ptosis, epicanthal folds, strabismus	Cytopenia, Bone marrow failure				Gastrointestinal anomalies – Atresias, imperforate anus, tracheoesophageal fistula, malrotation, Kidney – Abnormal, ectopic, horseshoe, hypoplastic, or absent kidney; hydronephrosis	Cardiopulmonary anomalies – Congenital heart disease (patent ductus arteriosus, atrial or ventricular septal defects, coarctation, situs inversus)		FA gene sequencing	Incrreased chromosomal breakage in response to mitomycin C or diepoxybutane (quite sensitive but not entirely specific)
Acquired Aplastic Anemia															typically a more rapid onset and progression of cytopenias; and a response to immunosuppressive therapy
Paroxysmal nocturnal hemoglobinuria (PNH)														Acquired mutations in the PIGA gene result in the dominance of a hematopoietic progenitor cell clone lacking glycosylphosphatidylinositol (GPI) anchors
Other inherited bone marrow failure syndromes
Diseases	Symptom 1	Symptom 2	Symptom 3	Physical exam 1	Physical exam 2	Physical exam 3	Lab 1	Lab 2	Lab 3	Imaging 1	Imaging 2	Imaging 3	Histopathology	Gold standard	Additional findings
Drug-induced or infection-associated pancytopenia
Rare chromosomal breakage syndromes
De novo myelodysplastic syndrome (MDS)