Resorlu and his colleagues determined a significant correlation between vertex pattern and total alopecia with urolithiasis in patients younger than 60 years old. Three hundred and two male patients were categorized as follows:
• Group I: No baldness (Hamilton-Norwood Scala [HNS] stage I)
• Group II: Hair loss in the frontal region (HNS stages II, III, IIIa, and IVa)
• Group III: Hair loss in the vertex region (HNS stage III-vertex, V)
• Group IV: Hair loss in both vertex and frontal regions (HNS stages IV, Va, VI, and VII)
As seen in the graph, a significant correlation between alopecia and urolithiasis was observed.
In another study, between January 2008 and November 2015, Polat and his colleagues retrospectively investigated the biochemical parameters and anthropometric characteristics (height and weight) of 200 patients who had urinary tract stones. They found that risk of urolithiasis increased 1.3-fold in patients with vertex pattern alopecia and 2.1-fold in patients with total alopecia compared with those with no hair loss.