Case and Research Letters
Double Nail of the Fifth Toe
Doble uña del quinto dedo del pie
L. Navarro Campoamor
Corresponding author
Servicio de Dermatología, Hospital Beata María Ana, Madrid, Spain
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A, Photopatch reading at 48 hours. The photopatches on the left were irradiated with UVA for 6 minutes using a Philips® HB 404 high pressure lamp (13.32 J/cm<span class="elsevierStyleSup">2</span>). The patches on the right were not irradiated. No contact or photo-contact reactions were observed for the standard battery or for the drugs that the patient had been prescribed. Results were also negative after 96 hours. B, Photoprovocation on day 1 of irradiation (7 min; 15.54 J/cm<span class="elsevierStyleSup">2</span>). The photoprovoked region consisted of an area directly irradiated with UVA (left) and an area covered with a water-filled Petri dish (right) to eliminate the infrared (IR) component. C, Photoprovocation at 144 hours. Isolated minute micropapules are evident on the left side of the irradiated area. Some of the lesions near the edge are larger. Milder lesions are also evident in the area protected from IR radiation.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "P. Fonda-Pascual, M.V. de Gálvez, J. Aguilera, E. Herrera-Ceballos" "autores" => array:4 [ 0 => array:2 [ "nombre" => "P." "apellidos" => "Fonda-Pascual" ] 1 => array:2 [ "nombre" => "M.V." "apellidos" => "de Gálvez" ] 2 => array:2 [ "nombre" => "J." "apellidos" => "Aguilera" ] 3 => array:2 [ "nombre" => "E." 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Navarro Campoamor" "autores" => array:1 [ 0 => array:4 [ "nombre" => "L." "apellidos" => "Navarro Campoamor" "email" => array:1 [ 0 => "lournacam@gmail.com" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "*" "identificador" => "cor0005" ] ] ] ] "afiliaciones" => array:1 [ 0 => array:2 [ "entidad" => "Servicio de Dermatología, Hospital Beata María Ana, Madrid, Spain" "identificador" => "aff0005" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Doble uña del quinto dedo del pie" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:8 [ "identificador" => "fig0015" "etiqueta" => "Fig. 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 644 "Ancho" => 750 "Tamanyo" => 71144 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0015" "detalle" => "Fig. " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Simple anteroposterior x-ray with no abnormal bone findings.</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">A 44-year-old man visited our department with prominences on both sides of the fifth toe, which had appeared following a walk, on which he had worn tight footwear. The patient complained of discomfort only when pressure was applied to this area. Physical examination revealed external rotation of the fifth toe and increased width of the nail plate on both small toes. Each of these nails was also covered by cuticle, divided by a longitudinal cleft, and the nail plate showed lateral thickening (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>A and <a class="elsevierStyleCrossRef" href="#fig0010">Fig. 2</a>A). Dermatoscopy confirmed that the nail consisted of 2 clearly demarcated parts (<a class="elsevierStyleCrossRefs" href="#fig0005">Fig. 1, Fig. 2, and Fig. 2</a>B). The patient was not aware of this abnormality in any family member. A simple anteroposterior and lateral x-ray of both feet was requested and ruled out the presence of accessory phalanges or other bone abnormalities (<a class="elsevierStyleCrossRef" href="#fig0015">Fig. 3</a>). No treatment was indicated, other than reduction of the direct trauma.</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0010" class="elsevierStylePara elsevierViewall">The double nail of the fifth toe (DNFT) or accessory nail of the fifth toe was described in 1969 by Huindeker and is an apparently common entity, although few published cases exist.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1–4</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The most common clinical presentation is the appearance of a wider-than-normal nail divided by a longitudinal cleft, fold, or depression, and the part corresponding to the accessory nail is smaller. A cuticle covers both nail plates in the proximal area of the nail. DNFT may be unilateral or bilateral, and when both toes are affected there tends to exist considerable symmetry.<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3,4</span></a> Clinical or aesthetic problems due to the size of the nail occur only occasionally.<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3,4</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">It is rare to find abnormalities in the x-ray of the fifth toe. Of 10 x-rays performed in 1 series, only 3 patients presented a lazy Y on the tip of the distal phalanx, and another patient presented a thorn-like bony excrescence.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> A Y-shaped tip of the terminal phalangeal bone was identified during surgery in 2 patients.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">DNFT was initially thought to be a hereditary process limited to the Han ethnic group, the largest ethnic group in China.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> Haneke, however, found that the entity showed no racial or ethnic predilection.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> Autosomal dominant heredity with variable expression has been proposed.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> Familial cases show no clear predisposition by sex, although women consult more for this abnormality.<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5,6</span></a> DNFT may represent an initial form of hexadactyly, which would give rise to a rudimentary nail.<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> Acute trauma may act on vestigial bone, inducing the appearance of a nail or on the onychodermis which, as specialized nail mesenchyma, would lead to nail formation and growth. The onychodermis is made up of onychofibroblasts and takes part in nail formation and growth.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">The histology of excised accessory nails varies from a depression like a sack of skin with hyperkeratosis like a nail plate, to a small nail with a matrix, proximal fold, nail bed, and hyponychium.<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5,6</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The differential diagnosis is established with ectopic nail, postoperative spiculated nail, onychophosis, or callus of the fifth toe. Ectopic nail or onychoheterotopia refers to growth of a nail outside the nail bed. It may be congenital or be associated with other diseases, and it is most frequent on the palmar region of the fingers. The acquired form is located on the dorsal region of the fingers and toes. Ectopic nails must have a matrix and nail plate but do not require a nail bed.<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> Onychophosis is a hyperkeratosis of the lateral folds of the nail triggered by frequent trauma to that area, which causes hypertrophy and thickening of the skin surrounding the nail. Calluses or corns on the external surface of the fifth toe consist of hyperkeratosis caused by repeated rubbing of footwear and are usually accompanied by intense pain.</p><p id="par0040" class="elsevierStylePara elsevierViewall">DNFT does not usually require treatment. If desired, phenolization of the accessory matrix or surgical excision of the accessory nail may be performed. Excision of DNFT allows for a better view and excision of the matrix, facilitates repair of the defect remaining after removing the accessory nail, and faster recovery than with other treatments. Curettage and electrocoagulation are not recommended because of the prolonged scarring process and the intense postoperative pain.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">In conclusion, we present a case of bilateral double nail of the fifth toe, which developed following acute trauma. This entity is considered to be common, not rare, and tends to go unnoticed. Further studies are required to determine the etiology of the entity.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0050" class="elsevierStylePara elsevierViewall">The author declares that he has no conflicts of interest.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:3 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Conflicts of Interest" ] 1 => array:2 [ "identificador" => "xack512102" "titulo" => "Acknowledgments" ] 2 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2019-03-27" "fechaAceptado" => "2019-04-09" "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: Navarro Campoamor L. Doble uña del quinto dedo del pie. Actas Dermosifiliogr. 2021;112:188–190.</p>" ] ] "multimedia" => array:3 [ 0 => array:8 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1244 "Ancho" => 750 "Tamanyo" => 123309 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Fig. " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Clinical image of the fifth toe. A, right toe. B, left toe presenting external rotation and increased nail size, with a longitudinal fissure dividing the nail plate.</p>" ] ] 1 => array:8 [ "identificador" => "fig0010" "etiqueta" => "Fig. 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1308 "Ancho" => 751 "Tamanyo" => 118390 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Fig. " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Dermatoscopy of the fifth toe. A, right toe. B, left toe.</p>" ] ] 2 => array:8 [ "identificador" => "fig0015" "etiqueta" => "Fig. 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 644 "Ancho" => 750 "Tamanyo" => 71144 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0015" "detalle" => "Fig. " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Simple anteroposterior x-ray with no abnormal bone findings.</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:8 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Hereditäre Nageldysplasie der 5. Zehe" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "M. Hundeiker" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:7 [ "tituloSerie" => "Hautarzt" "fecha" => "1969" "volumen" => "20" "paginaInicial" => "281" "paginaFinal" => "282" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/5355969" "web" => "Medline" ] ] "itemHostRev" => array:3 [ "pii" => "S0735109715001448" "estado" => "S300" "issn" => "07351097" ] ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0010" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Therapie von Nagelfehlbildungen" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "E. 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Wang" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1111/j.1524-4725.2004.30351.x" "Revista" => array:7 [ "tituloSerie" => "Dermatol Surg" "fecha" => "2004" "volumen" => "30" "paginaInicial" => "1177" "paginaFinal" => "1179" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/15274716" "web" => "Medline" ] ] "itemHostRev" => array:3 [ "pii" => "S0735109719338264" "estado" => "S300" "issn" => "07351097" ] ] ] ] ] ] ] 3 => array:3 [ "identificador" => "bib0020" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Double nail of the little toe" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "E. Haneke" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1159/000443378" "Revista" => array:7 [ "tituloSerie" => "Skin Appendage Disord" "fecha" => "2015" "volumen" => "1" "paginaInicial" => "163" "paginaFinal" => "167" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/27386457" "web" => "Medline" ] ] "itemHostRev" => array:3 [ "pii" => "S0735109716368280" "estado" => "S300" "issn" => "07351097" ] ] ] ] ] ] ] 4 => array:3 [ "identificador" => "bib0025" "etiqueta" => "5" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Histopathology of the nail" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "E. Haneke" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:6 [ "edicion" => "1sd ed" "fecha" => "2017" "paginaInicial" => "156" "paginaFinal" => "157" "editorial" => "Taylor & Francis Group" "editorialLocalizacion" => "India" ] ] ] ] ] ] 5 => array:3 [ "identificador" => "bib0030" "etiqueta" => "6" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Nail contour variatons" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "R. Baran" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "LibroEditado" => array:6 [ "editores" => "R.Baran, S.Hadj-Rabia, R.Silverman" "titulo" => "Pediatric nail disorders" "paginaInicial" => "27" "paginaFinal" => "28" "edicion" => "1sd ed" "serieFecha" => "2017" ] ] ] ] ] ] 6 => array:3 [ "identificador" => "bib0035" "etiqueta" => "7" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "The Concept of Onychodermis (Specialized Nail Mesenchyme) Is Applicable in Normal Adult Nail Unit" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => "J.H. Park" 1 => "D.Y. Lee" 2 => "S.Y. Ha" 3 => "K.T. Jang" 4 => "G.Y. Kwon" 5 => "K.H. Lee" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.5021/ad.2017.29.2.234" "Revista" => array:5 [ "tituloSerie" => "Ann Dermatol." "fecha" => "2017" "volumen" => "29" "paginaInicial" => "2346" "itemHostRev" => array:3 [ "pii" => "S0735109714043101" "estado" => "S300" "issn" => "07351097" ] ] ] ] ] ] ] 7 => array:3 [ "identificador" => "bib0040" "etiqueta" => "8" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Onychoheterotopia: pathogenesis, presentation, and management of ectopic nail" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:3 [ 0 => "F. Riaz" 1 => "R.M. Rashid" 2 => "A. Khachemoune" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1016/j.jaad.2009.11.018" "Revista" => array:7 [ "tituloSerie" => "J Am Acad Dermatol." "fecha" => "2011" "volumen" => "64" "paginaInicial" => "161" "paginaFinal" => "166" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/20724029" "web" => "Medline" ] ] "itemHostRev" => array:3 [ "pii" => "S0735109717369000" "estado" => "S300" "issn" => "07351097" ] ] ] ] ] ] ] ] ] ] ] "agradecimientos" => array:1 [ 0 => array:4 [ "identificador" => "xack512102" "titulo" => "Acknowledgments" "texto" => "<p id="par0055" class="elsevierStylePara elsevierViewall">The author would like to thank Dr. Eckart Haneke for the clinical assessment of the presented case.</p>" "vista" => "all" ] ] ] "idiomaDefecto" => "en" "url" => "/15782190/0000011200000002/v1_202102100758/S1578219020304091/v1_202102100758/en/main.assets" "Apartado" => array:4 [ "identificador" => "6157" "tipo" => "SECCION" "en" => array:2 [ "titulo" => "Case and Research Letters" "idiomaDefecto" => true ] "idiomaDefecto" => "en" ] "PDF" => "https://static.elsevier.es/multimedia/15782190/0000011200000002/v1_202102100758/S1578219020304091/v1_202102100758/en/main.pdf?idApp=UINPBA000044&text.app=https://actasdermo.org/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1578219020304091?idApp=UINPBA000044" ]
| Year/Month | Html | Total | |
|---|---|---|---|
| 2024 November | 19 | 7 | 26 |
| 2024 October | 223 | 69 | 292 |
| 2024 September | 340 | 46 | 386 |
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| 2023 November | 273 | 38 | 311 |
| 2023 October | 268 | 25 | 293 |
| 2023 September | 276 | 29 | 305 |
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| 2022 December | 72 | 49 | 121 |
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| 2022 September | 69 | 29 | 98 |
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