LETTER TO EDITOR
Year: 2020 • Volume: 3 • Issue: 3 • Page: 72-73

THE USE OF A SIMPLE GLASS VIAL AS A MODIFIED CONTACT PLATE FOR VIDEODERMOSCOPY OF THEEAR CONCHA

Sandip Agrawal1, Rachita Dhurat , Aseem Sharma1, Deep Jarsania,1

1Dept. of Dermatology, Lokmanya Tilak Municipal Medical College & General Hospital, Sion, Mumbai-400022

Corresponding Author:

Dr. Rachita Savalaram Dhurat

B 14/2, Maitri Park Society, Sion Trombay Road, Chembur, Mumbai – 400 071

Mobile- 9830790057

Email- rachita.dhurat@yahoo.co.in

How to cite this article:

Sharma S, Dhurat S, Vishwanath T, Agarwal S, Jasrania D, Sharma R. Chrysalis sign– A new dermoscopicentity in the diagnosis of angiolymphoid hyperplasia with eosinophilia. JDA Indian Journal of Clinical Dermatology 2020;3:72-73

Sir,

Polarized Contact dermoscopy (PCD) scores higher over polarized non-contactdermoscopy (PNCD) to visualize specific structures like shiny white streaks,crystalline areas, fine dots or peppering, to differentiate between blue and white colours and for vascular lesions. (1) Conventional contact plates that are supplied with videodermoscopes, pose a challenge to examine difficult-to-access areas likethe concha of the external ear(Figure 1a&b), interdigital area and the vestibule of the mouth.These areas have irregular contours, thereby making uniform contact difficult.These plates are limited by their size, shape and financial effect. We devised theuse of a simple glass vial as a contact plate to overcome this. (Figure-2a,b&c) Fig. 1a,b, 2a,b,c

Technical Solution: We used an empty, transparent, uncorked 1mL glass vial (injection histoglob) vial as a contact plate adapter. When inserted into the central column of the polarized video dermoscope, head first, it makes for a perfect fit, and its base serves as a contact plate. The refracted light from the surface of the contact plate is blocked by the polarizing filter. Thisassembly can be used to facilitate uniform contact with the surface, and visualize space-constrained areas, as shown in the figures. The resultant images and sharp, and the said structures are delineated, with no compromise on quality. (Figure-2d&e)

Figure-1 (a): A difficult-to-access area: the aural concha

Figure-1 (a): A difficult-to-access area: the aural concha

Figure-1 (b): Inability to establish contact with the existing

Figure-2. (a)&(b): A simple, transparent glass vial with the video dermoscopy (c) Insertion of the said vial into the central column, making it a perfect

Figure-1 (c): Insertion of the said vial into the central column, making it a perfect fit

Figure-1 (d): Uniform contact achieved in a difficult-to-access area

Figure-1 (e): Sharp images, with good delineation of structures. Seen here, are lesions of angiolymphoid hyperplasia with eosinophilia with white orthogonalchrysalis-like structures over an erythematous hue.

References

1. Benvenuto-Andrade C, Dusza S, Agero A et al. Differences Between Polarized Light Dermoscopy and Immersion Contact Dermoscopy for the Evaluation of Skin Lesions. Arch Dermatol. 2007;143(3). doi:10.1001/archderm.143.3.329