Journal of Cytology

LETTER TO EDITOR
Year
: 2019  |  Volume : 36  |  Issue : 4  |  Page : 217--218

Cytological features of cutaneous granular cell tumor: A brief report


Shweta Pal1, Neha Nautiyal1, Kriti Kaira2, Vivek Bharosay1,  
1 Department of Pathology, Shridev Suman Subharti Medical College, Dehradun, Uttarakhand, India
2 Department of Trauma and Laboratory Medicine, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India

Correspondence Address:
Dr. Shweta Pal
Assistant Professor, Department of Pathology, Shridev Suman Subharti Medical College, Dehradun, Uttarakhand
India




How to cite this article:
Pal S, Nautiyal N, Kaira K, Bharosay V. Cytological features of cutaneous granular cell tumor: A brief report.J Cytol 2019;36:217-218


How to cite this URL:
Pal S, Nautiyal N, Kaira K, Bharosay V. Cytological features of cutaneous granular cell tumor: A brief report. J Cytol [serial online] 2019 [cited 2019 Dec 11 ];36:217-218
Available from: http://www.jcytol.org/text.asp?2019/36/4/217/267227


Full Text



Sir,

Granular cell tumors (GCTs) are uncommon neural origin tumors. It is most commonly found in tongue, breast, upper respiratory tract, and subcutaneous tissue of extremities.[1] As the lesions presenting on skin are located deep in the dermis, they are not aspirated very often, and reports on their cytological diagnosis at this site are few in literature.[2] The cytological diagnosis of GCT is quite challenging as it mimics many soft tissue and inflammatory lesions.

A 55-year-old female presented with a painless, deep-situated swelling in the right infraclavicular region since 6 months. The swelling was 2 × 1 cm in size, ill-defined, nontender, and firm in consistency. Fine needle aspiration was done and smears were stained by May–Grünwald–Giemsa.

Smears were moderately cellular showing clusters of cells having polygonal shape with abundant, fragile, eosinophilic, finely granular cytoplasm. The nucleus was round, with bland chromatin. Few cells showed small nucleoli and intranuclear cytoplasmic inclusions. Many stripped nuclei were also seen scattered singly. Mild nuclear pleomorphism was seen [Figure 1]a and [Figure 1]b. Based on these features, a cytological diagnosis of benign GCT was suggested.{Figure 1}

Histopathological examination showed an unencapsulated tumor comprising closely packed sheets of polygonal cells having highly eosinophilic, granular cytoplasm with central round nucleus and bland nuclear chromatin surrounding nerve fibers and skeletal muscle bundles. Features were suggestive of GCT [Figure 1]c. Special stains including periodic acid–Schiff (PAS) and PAS-D (diastase) were done, which were positive and PAS-D-resistant. Immunohistochemistry using S-100 was done which showed strong cytoplasmic and nuclear positivity which confirmed the diagnosis [Figure 1]d.

GCT arises in middle-aged adults with slight female predominance. The differential diagnosis (DD) includes xanthogranuloma, alveolar soft part sarcoma (ASPS), rhabdomyoma, malignant GCT, and oncocytic lesions as all these present with cells having abundant eosinophilic cytoplasm on cytology.[3] In this case, the closest DD was apocrine carcinoma of breast as the swelling was situated close to the breast tissue. In contrast to GCT, the cells in apocrine carcinoma show a more distinct, slightly basophilic cytoplasm, significant nuclear atypia, pleomorphism, and prominent nucleoli, and hence this possibility was ruled out. Skeletal muscle neoplasms, rhabdomyoma, and ASPS are close mimickers of GCT. Whereas rhabdomyoma was excluded by the absence of cross striations and spider cells, ASPS was ruled out by the absence of nuclear atypia and intracytoplasmic rhomboid crystals.[4] Malignant GCT, although very rare, was also excluded due to the lack of nuclear atypia. Xanthogranuloma was also easily ruled out due to absence of accompanying inflammatory cells and histiocytes having vacuolated cytoplasm and indented nucleus.

Definitive cytological diagnosis of GCT is possible by sequentially excluding out its close mimickers. Presence of intranuclear cytoplasmic inclusions (described by Liu et al.,[5]) and stripped nuclei which arise due to fragility of cells[4] also provide important diagnostic clue. Since GCT is known for recurrence, its correct preoperative cytological diagnosis becomes essential to enable a wide local resection.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

References

1Khurana U, Handa U, Mohan H. Fine-needle aspiration cytology of cutaneous granular cell tumor: Report of two cases with special emphasis on cytological differential diagnosis. J Cytol 2016;33:30-3.
2Singh A, Sawhney M, Das S. Granular cell tumor of skin diagnosed on fine needle aspiration cytology. Indian J Dermatol 2012;7:330-1.
3Sung WJ, Choi JH. Imprint cytology of granular cell tumor: A case report. Korean J Cytopathol 2007;18:170-4.
4Koshy J, Schnadig V, Nawgiri R. Is fine needle aspiration cytology a useful diagnostic tool for granular cell tumors? A cytohistological review with emphasis on pitfalls. Cyto J 2014;11:28.
5Liu K, Madden JF, Olatidoye BA, Dodd LG. Features of benign granular cell tumor on fine needle aspiration. Acta Cytol 1999;43:552-7.