Abstract

INTRODUCTION

Subcutaneous panniculitis-like T-cell lymphoma (SPTCL) belongs to the category of extranodal mature T and NK-cell neoplasms.[1,2] This preferentially infiltrates the subcutaneous tissue [Figure 1] and is composed of atypical lymphoid cells of varying size with marked tumor necrosis, karyorrhexis and angioinvasion.[1,2]

SPTCL is rare accounting for less than 1% of all NHLs. It has a wide age range usually occurring in the elderly (median age 64 years) with a slight male preponderance. It involves the extremities and trunk, usually presenting as multiple subcutaneous nodules, symptoms being primarily related to these nodules. The association of SPTCL with other malignancies is unusual, though they have been reported in allograft recipients and in a case of ovarian carcinoma.[3,4] Here, immunosuppression appears to be a predisposing factor.

CASE REPORT

A 42-year-old lady, presented with two indurated and painful patches in the lower part of her anterior abdominal wall, the right hypochondriac and lumbar regions. This was three months after completing chemotherapy and radiotherapy for a squamous cell carcinoma of the cervix for which she had been operated five months prior to the present complaint. She had received treatment at another hospital.

On local examination, there was an ill-defined, diffuse thickening and hardening of the abdominal wall. FNAC was attempted but yielded scanty material, hence was inconclusive. An incisional biopsy was performed and submitted for histopathology.

PATHOLOGIC FINDINGS

Grossly, the specimen was skin covered tissue measuring 6 × 5.5 × 4.5 cm. The external and cut surfaces were unremarkable except for a few thickened whitish streaks in the subcutis.

Microscopically, there was an unremarkable epidermis and dermis [Figure 1a]. The subcutis had a diffuse infiltrate of small-to-medium-sized atypical lymphoid cells with a few larger cells with prominent nucleoli [Figure 1b]. The tumor cells were seen rimming adipocytes [Figure 2a]. Mitotic activity was brisk with abundant karyorrhectic debris. Foci of angioinvasion were seen [Figure 2b]. Histiocytic aggregates forming ill-defined granulomas were present. Numerous lipid laden foamy histiocytes were also seen. There was no evidence of a metastatic carcinoma.

DISCUSSION

SPTCL is a rare entity,[1] accounting for less than 1% of all NHLs. Its association in immunosuppressed states has been reported;[3,4] however, its synchronous or metachronous occurrence in treated cases of cervical carcinomas has not been reported hitherto in the English literature. Most SPTCLs occur sporadically.

SPTCL, as the name indicates, infiltrates diffusely through the subcutaneous tissue while sparing the dermis and epidermis,[2] except in the gamma-delta subtype, where the mid and deep dermis may be involved.[5] The lace-like pattern of infiltration resembles a lobular panniculitis. The atypical cells range from small-to-medium to large cells with brisk mitoses, necrosis, karyorrhexis and angioinvasion. A typical rimming of adipocytes by tumor cells is characteristic. Often admixed reactive histiocytes are seen many of which may have finely vacuolated cytoplasm. Histiocytic aggregates forming granulomas are also present.[1]

Immunophenotypically, these cells have a mature T-cell phenotype, are CD8 positive and CD4 negative.[1,6] They also express cytotoxic molecules like T-cell intracellular antigen (TIA-1), perforin and granzyme B.[7,8,9] Most cases express alpha beta T-cell receptor gene rearrangement, but up to 25% express gamma-delta T-cell receptor gene rearrangement.[1,5] These latter cases may be positive for CD56.[7]

Association with other malignancies is rare though immunosuppression appears to be a predisposing factor, especially in those with a gamma-delta phenotype. Renal allograft recipients and occasional cardiac allograft patients with SPTCL have been reported.[3] The only other report of it arising after chemotherapy for a case of ovarian carcinoma has been recently published.[4]

However, its occurrence in the setting of a treated case of carcinoma cervix has not been reported. In these circumstances, the possible role of immunosuppression as an etiopathogenetic factor could be considered.

SPTCLs are lymphomas for which treatment modalities are as yet not well defined. The cell of origin is the cytotoxic T-cell.[8] SPTCL arising as a second malignancy is very unusual. In this case it is possible that it had arisen in a state of immunosuppression, as a result of chemotherapy and radiotherapy for the earlier carcinoma cervix.

The potential for aggressive behavior warrants an early diagnosis with an extended panel of immunohistochemical stains for optimal patient outcome.

Footnotes