The transversely sectioned scalp biopsy specimen: the technique and an algorithm for its use in the diagnosis of alopecia.

The discussion of the transverse section scalp biopsy specimen technique review of the microanatomy of the scalp in transverse section, and algorithm outline hopefully will be a useful starting point for the dermatopathologist and dermatologist interested in exploring the potential of this technique in the diagnosis of alopecia. These procedures are not without limitations and further refinements are essential, but they can be a valuable aid in the diagnosis of alopecia.