Category Archives: Interesting Cases

Hodgkin’s Lymphoma – Pitfalls in Diagnosis


Hodgkin’s lymphoma has been known for over 175 years. For about 140 of these the malignant nature of the disease was not certain. The hallmark of Hodgkin’s lymphoma is the Reed-Sternberg cell, which was described independently by Dorothy Reed (1902) and Carl Sternberg (1898). Neither considered Hodgkin’s lymphoma malignant. Diagnosis of Hodgkin’s lymphoma is a challenge even today as the case discussed illustrates.

A 21 year old male presented with a swelling of the right side of the neck and fever. Examination revealed cervical lymphadenopathy. No other nodes were enlarged. An FNAC was reported as chronic lymphadenitis. Anti-tuberculous therapy was started. The lymph nodes increased over the next three months and the fever failed to abate. This was attributed to a paradoxical reaction to treatment and the anti-tuberculous therapy was continued. The patient sought a second opinion after four months of therapy. A lymph node biopsy was performed and a diagnosis of Hodgkin’s lymphoma was made. When staged this patient has stage IIIB Hodgkin’s lymphoma.

The common cause of lymphadenopathy are infections – bacterial, viral, mycobacterial or fungal; malignancy – lymphomas or metastatic; and autoimmune diseases. Lymphadenopathy of acute infection resolves spontaneously or following treatment with antibiotics. These nodes are usually inflamed and tender and are rarely confused with malignancy. Persistent lymphadenopathy is commonly due to tuberculosis, malignancy or autoimmune diseases and needs investigation.

Fine needle aspiration cytology (FNAC) is performed by aspirating material, usually using a 21 or 22 gauge needle, and smearing it onto a slide. It has the advantage of being less invasive than a biopsy. The processing time for FNAC is short and reports are often available on the same day. On the flip side only a small part of the lymph node is sampled and the process of smearing disrupts architecture. FNAC is best for diagnosis of malignancies where a diagnosis can be made by examination of single cells e.g. squamous cell carcinoma or an adenocarcinoma.  FNAC has limitations in the diagnosis of lymphoma. A negative report does not exclude the diagnosis of lymphoma and all lymphomas can not be classified by FNAC.

Though described by Thomas Hodgkin in 1928, it was only in 1967, when the Reed-Sternberg cell was shown be clonal by cytogenetics, that Hodgkin’s lymphoma was proven to be a malignancy. The two terms prevalent for the disease, Hodgkin’s disease and Hodgkin’s lymphoma reflect the uncertainty about the pathogenesis of Hodgkin’s lymphoma. Hodgkin’s Lymphoma is a lymphoma that almost always arising from the B lymphocytes. What makes Hodgkin’s lymphoma different from other common B cell lymphomas like follicular lymphoma or diffuse large B cell lymphoma?

Most of the cells in non-Hodgkin’s lymphomas like diffuse large B cell lymphoma are malignant. Most of the cells in Hodgkin’s lymphoma are reactive cells – lymphocytes, eosinophils, neutrophils, histiocytes and plasma cells (figure 1). The lymphadenopathy of Hodgkin’s lymphoma is because of normal cells whereas the lymphadenopathy of diffuse B lymphocytic lymphoma or a follicular lymphoma is because of malignant cells. The lymphadenopathy of tuberculosis or any other chronic inflammatory process is due to a reactive infiltrate, much like Hodgkin’s lymphoma. FNAC of a lymph node of a diffuse large B cell lymphoma shows malignant cells making diagnosis possible. FNAC of a node involved by Hodgkin’s lymphoma is most like to give a normal inflammatory infiltrate making it impossible to differentiate between Hodgkin’s lymphoma and a cause of chronic lymphadenopathy like tuberculosis. If a Reed-Sternberg cell is seen on FNAC a diagnosis is possible, but given the paucity of the Reed-Sternberg cell in Hodgkin’s lymphoma this rarely happens. FNAC is appropriate for the initial evaluation of a lymphadenopathy, but a biopsy should to be performed when the results of FNAC are not diagnostic.

Figure 1. Histology of Hodgkin’s lymphoma. The malignant cell of Hodgkin’s lymphoma is the Reed-Sternberg (RS) cell. The RS cell is surrounded by a reactive infiltrate consisting of T-lymphocytes along with a varying number of eosinophils, neutrophils, histiocytes and plasma cells. A node involved by Hodgkin’s lymphoma has very few RS cells. The bulk of the node is made up by normal cell. (Modified from http://www.flickr.com/photos/euthman/3884125493/)

Eleven to fifteen percent of the patients with tuberculosis have a paradoxical reaction after starting anti-tuberculous therapy characterized by increasing fever and worsening of clinical and X ray findings (Eur J Clin Microbiol Infect Dis 2003;22:597-602). Paradoxical reaction was first described by Chloremis in 1955 (Am Rev Tuberc 1955;72:527-36) and may be seen 14-270 days after starting anti-tuberculous therapy (Eur J Clin Microbiol Infect Dis 2002;21:803-9). Tuberculoproteins released as a result of rapid killing of bacteria are responsible for paradoxical reaction. Paradoxical reaction in a patient who has been initiated on anti-tuberculous therapy on the basis of diagnosis of tuberculosis made by FNAC, unlike those diagnosed on biopsy, raises the possibility of lymphoma.

Diagnosis of Hodgkin’s lymphoma is not complete without immunophenotyping. This is best done on a biopsy specimen. Given the limitations of FNAC in the diagnosis of lymphoma, it is ideal to perform an excision biopsy of the lymph node if a definitive diagnosis is not possible by FNAC. In case an excision is not possible a large wedge biopsy should be performed. Deep seated lymphomas can be diagnosed by a needle (Tru-Cut) biopsy. The specimen must be sent to a pathologist with experienced and equipment to diagnose lymphoma.

Every oncologist practicing in regions of the world where tuberculosis is prevalent sees patients who have been diagnosed with advanced Hodgkin’s lymphoma after months of anti-tuberculosis therapy. FNAC is an attarctive test in a resource constrained practice but the limitations need to be appreciated. The clinician must understand what the pathologist is trying to say. A report of “chronic lymphadenitis”  must not be treated as tuberculosis. The pathologist must not say more than what the FNAC shows. Every “chronic lymphadenitis” is not tuberculosis!

Pseudomyxoma Peritonei


A 62 year old male who had been operated for a carcinoma of the rectum presented with pain and distension of the abdomen. The CT scan showed a fluid with a density more than simple fluid and scalloping of the liver. A diagnosis of pseudomyxoma peritonei was made. There was no evidence of a rectal tumour.

The term pseudomyxoma peritonei was used by Werth to describe a patient with ruptured ovarian cystadenoma and gelatinous intraperitoneal material. It is a term used to describe a clinical picture associated with release of intraperitoneal mucin from malignant and benign tumours. The malignant tumours associated with pseudomyxoma peritonei are low grade tumours, usually of the appendicular ovarian origin. The cells produce mucin but have a very low metastatic potential. This results in a predominant intraperitoneal growth resulting in accumulation of mucin and severe abdominal dissention and symptoms.

The CT scan shows scalloping of the liver and spleen. Scalloping is distortion of the liver/spleen margins because of extrinsic pressure of adjacent peritoneal implants without liver parenchymal metastasis. There is ascitic fluid that is slightly denser than simple fluid density. Occasionally amorphous calcifications may be seen. Primary tumour is usually not visible at diagnosis. Scalloping of the liver and ascitic fluid with a greater than fluid density is seen on this scan.

The outcome of pseudomyxoma peritonei depends of the malignant potential and the origin of the tumour responsible for pseudomyxoma. Appendiceal tumours have the best outcome and gastric tumours have the worst outcome. Tumours which show invasive features have a worse outcome.

The disease is treated by surgical debunking. Intraperitoneal chemotherapy may be given. Hyperthermic intraperitoneal chemotherapy (HIPEC) or early post-operative intraperitoneal chemotherapy (EPIC) may be given. HIPEC is associated with better tolerability, lesser adverse effects and better survival.

Images of Peutz-Jeghers Syndrome


Below are images I had taken of a young woman (about 25yrs old). I do not remember what she was admitted for, but if I am not mistaken it was an illness unrelated to Peutz-Jeghers Syndrome (PJD), probably a febrile illness. A colleague of mine asked me if I had seen the circumoral pigmentations of PJD. Fortunately, I had been carrying my Nikon Coolpix 4500 on that day.

Circumoral Pigmentation

Mucosal Pigmentation

Jejunal Polyp

PJD is an autosomal dominant disease caused by germline mutations of the gene STK11 (also known as LKB1) located on the short arm of chromosome 19 (19p). It is characterized by mucocutaneous pigmentation, hamartomas of the gastrointestinal tract and a very risk of malignancy. STK11 mutations are not identifiable in about 25% of the patients. These patients are believed to have inactivation of the gene by other mechanisms. About ½ to 1/3rd of the patients have new mutations. The incidence of PJS ranges from 1 in 30,000 to 1:200,000 births

Pigmentation classically involves the lips and buccal mucosa but other areas including hands and feet but may be seen around the nose, orbits anus and genitals. It is caused by melanin. Spots present at birth but may fade with age and adults may not have the spots. About 5% patients do not have pigmentation.

PJS is associated with hamartomatous polyps. Hamartomatous polyps are polyps composed of the normal layers of the intestine but with a markedly distorted architecture. It results from an overgrowth and is not, at least initially, to have a malignant potential. The polyps may be pedunculated or sessile and vary in size from few mm to 3-4 cm. Eighty percent of the patients have jejunal polyps, 40% in the stomach and 40% in the colon. The PJD polyps have no distinctive endoscopic features but can be differentiated from other syndromes by distinctive histopathologic features of arborizing pattern of smooth muscle throughout the polyp. Patients usually present in the second decade of life with abdominal pain, rectal bleeding, anaemia, small intestinal intussusception, bowel obstruction, and rectal prolapse of polyps. Forty to fifty percent of patients need a surgery for polyp related bowel obstruction

From Peutz-Jeghers Syndrome in Familial Cancer Syndromes Editor Douglas L Riegert-Johnson. NCBI 2009

Patients of PJS are at a very high risk of malignancy and the risk is not confined only to the gastrointestinal tract. Almost all patients with PJS will develop a malignancy. PJS increases the risk of small intestinal carcinoma by more than 500 times. The risk of other gastrointestinal cancers, breast cancer, cancer of the uterus and ovary are also increased.

Cancer Cumulative Risk* Relative Risk#
All 93% 15.2
Oesophagus 0.5% 57
Stomach 29% 96
Small Intestine 13% 520
Colon 39% 84
Pancreas 36% 132
Lung 15% 17
Testis 9% NS
Breast 54% 15.2
Uterus 9% 16
Ovary 21% 27
Cervix 10% NS

Data sourced from * Giardiello FM, Trimbath JD. Peutz-Jeghers syndrome and management recommendations. Clin Gastroenterol Hepatol. 2006;4:408-415.
# Giardiello FM, et al Very high risk of cancer in familial Peutz–Jeghers syndrome. Gastroenterology. 2000 Dec;119(6):1447-53

PJD is treated by polypectomy that may be performed by intraoperative endoscopy or double balloon endoscopy. There are no recommendations for screening patients. The disease is rare and evolving formal recommendations will be difficult. Given below is a graphic compilation of screening recommendations from sources listed by Giardiello and Trimbat (see table above).

Internet resources for PJS include

  1. Peutz-Jeghers Syndrome in Familial Cancer Syndromes
    Editor Douglas L Riegert-Johnson. NCBI 2009
  2. Peutz-Jeghers.com

Mediastinal Adenopathy with Brain lesions


A 26 year old male patient presented with fever of five days duration. The complete haemogram showed a haemoglobin of 13.2g/dL, WBC count of 13500/mm3 with a differential count of 75% polymorphs, 21% lymphocytes, 2% eosinophils and 2% monocytes and a platelet count of 232,000/mm3. The smear did not show plasmodium and the serology for dengue and HIV was negative. The liver and kidney functions and the X-ray Chest was normal.

A CT scan of the chest was performed which showed mediastinal adenopathy which showed patchy enhancement on injection of contrast. The site was deemed as inaccessible for a biopsy

The patient was initiated on four drug anti-tuberculous therapy. The fever subsided in a week.

About two weeks after discharge the patient has a left sided seizure with unconsciousness. He was admitted to the hospital anti-convulsants given and an MRI of the brain preformed.

The MRI showed multiple ring enhancing lesions in the bilateral fronto-parietal temporal lobes with significant peri-lesional oedema and a significant midline structures to the left due to the right frontoparafalcine lesion.

Lymphoma is a highly curable tumour that mimics tuberculous lymphadenitis. Delay in treatment of high grade lymphomas compromises the chance of cure. Lymph node biopsy is an invasive procedure sometimes needing laparotomies and thoracotomies. The issues that arise when a lymph node is relatively inaccessible are:

Is biopsy needed for all patients with lymphadenopathies?

Patients with lymphadenopathy and an infective/inflammatory pathology in the drained areas need not be biopsied. Patients with inflamed nodes need not be biopsied. Patients with deep seated nodes in whom a certain diagnosis can be made by non-invasive tests need not be biopsied. All other patients should be biopsied. FNAC, unless it yields a specific diagnosis, is an inadequate investigation for lymphadenopathy. An excision biopsy is ideal. A large wedge biopsy is acceptable for large nodes and a trucut biopsy is appropriate for deep seated nodes. Many patients have succumbed to an advanced lymphoma because of delayed diagnosis from an inappropriate or inadequate biopsy. From the pathologists point of view the diagnosis of lymphoma may be one of the most challenging. Not everyone is experienced enough to make the diagnosis. Even the experienced pathologists can only report on the material provided. Providing appropriate material is the responsibility of the clinician. When one is treating on a clinical diagnosis the patients needs a close monitoring for signs of treatment failure and an alternative diagnosis.

Is there a blood test for the diagnosis of lymphomas?

Lymphomas are of two types Hodgkin’s and non-Hodgkin. Non-Hodgkin’s lymphoma is a collection of about 30 distinct malignancies of the lymphoid cells. Non-Hodgkin’s lymphomas have a leukaemic phase i.e. the phase when the malignant cells spill into the blood. Leukaemic phase occurs early in the course of the disease in patients with low grade lymphomas e.g. small lymphocytic lymphoma, follicular lymphomas and splenic marginal zone lymphomas and very high grade lymphomas e.g. Burkitt’s lymphoma and lymphoblastic lymphoma. The leukaemic phase of small lymphocytic lymphoma is chronic lymphocytic leukaemia and that of very high grade lymphomas is acute lymphoblastic leukaemia. Blood tests can only diagnose lymphomas which are in the leukaemic phase. There are no other blood tests for the diagnosis of lymphomas

Does an MRI scan differentiate a lymphoma from tuberculosis?

A tuberculous granuloma caseates resulting in ring enhancement and oedema around the lesion. The other ring enhancing lesions include primary brain tumour (glioblastoma), metastasis (especially post chemotherapy), abscess, Toxoplasma and Cryptococcus in HIV, resolving hematoma (10-21 days), radiation necrosis, and aneurysm. The MRI features of a primary CNS lymphoma in an immune competent host are quite distinct. The tumour is isointense on T1 and show pronounced uniform enhancement and very little peri-lesional oedema. Ring enhancement is seen rarely. In immunocompromised patients ring enhancement, multiple lesions, spontaneous haemorrhage and non-enhancing lesions are common making it difficult to distinguish CNS lymphoma from infections in these patients. A patient with high index of suspicion of lymphoma must undergo a biopsy.

Could these CNS lesions be from a lymphoma?

The MRI picture is inconsistent with a lymphoma in an immune competent patient. Synchronous CNS and systemic lymphomas are very rare and have been reported only in immunocompromised patients. One report of AIDS related lymphomas described synchronous CNS involvement in 5/19 patients (Annals of Oncology 18 (Supplement 9): ix178–ix182, 2007, abstract 71). Synchronous CNS involvement has also been described in a child with immunodeficiency J Pediatr Hematol Oncol. 2008 Apr;30(4):317-9. Isolated CNS relapse from a lymphoma is seen in less than 1% of the patients. This patient was treated as tuberculosis.