unguis tegularis / unguis convolutus / convexe nagel = tunnelnagel of krulnagel

aangeboren => alle nagels
door schoeisel => krul vaak eenzijdig)
bloedsomloop => geeft ook een verdikte nagel

http://www.geluksvoetensalon.nl/nagels/


CONVOLUTED TOENAILS
Convoluted toenails are where the nail plate tends to roll up into itself (Fig 6). They can resemble a poorly constructed hand-made cigar. Grossly deformed nails like this can be due to an abnormal bony outgrowth within the toe (subungual exostosis Fig 7).
But are more often caused by a past history of a severe injury to the nailgerminating matrix

http://www.biomechanicsfootlab.com/LinkClick.aspx?fileticket...

Pincer Toenails

A pincer nail is a medical condition were the sides of the toenails become curved inwards. The condition is also called in-curved nail, trumpet nail, convoluted nail, omega nail, and transverse over-curvature. The process can take years to develop and as the nail progressively becomes more and more curved the edges of the nail can begin to irritate the toe and often cause an ingrown toenail. The curvature usually increases as you move from the base of the nail out to the tip. A pincer nail can become so curved that when looking at the toe from the tip the two sides of the toenail are almost touching and sometimes even form a tube. The condition is often accompanied by thickening of the nail as well. This makes the nails very difficult to trim. Patients and podiatrist often tend to round off the nails when they trim them in an effort to reduce pressure on the distal portion of the toe and improve cosmetic appearance of the nail. The nail can also be ground down in the center further improving the facade of a flat normal toenail. Unfortunately, this technique often results in the development of a painful ingrown toenail

https://gulfsouthfootandankle.com/conditions/nail-conditions...

Pincer nails

Pincer nails (also known as "Omega nails," and "Trumpet nails"[1]) are a toenail disorder in which the lateral edges of the nail slowly approach one another, compressing the nailbed and underlying dermis. It occurs less often in the fingernails, and there usually are no symptoms. .[1][2]:788–9

Hereditary pincer nails have been described although the genes or mutations causing the hereditary form seem to be unknown.[

https://en.wikipedia.org/wiki/Pincer_nails