Diagnosis and Differential Diagnosis of Tertiary Androgenetic Alopecia With Severe Alopecia Areata Based on High-Resolution MRI

The study used high-resolution MRI to differentiate between tertiary androgenetic alopecia (AGA) and severe alopecia areata (AA) in 48 participants: 18 with AGA, 10 with AA, and 20 healthy volunteers. The MRI results showed significant differences in scalp thickness, subcutaneous tissue layer thickness, follicle depth, and number of follicles within a 2-cm distance between the AGA group and healthy volunteers. Similarly, significant differences were found in the thickness of the subcutaneous tissue and the relative depth of the hair follicles between the AGA and the AA groups. The study concluded that the thickness of the subcutaneous tissue layer can be used as a basis for differential diagnosis between the two conditions. Limitations of the study include a small sample size and lack of investigation into imaging anatomical changes in occipital alopecia in patients with AGA.